2021/12/15 更新

写真a

キシモト アキラ
岸本 昭
KISHIMOTO Akira
所属
自然科学学域 教授
職名
教授
外部リンク

学位

  • 工学博士

研究キーワード

  • 無機材料科学

  • Inorganic material science

研究分野

  • ナノテク・材料 / 無機材料、物性

  • ナノテク・材料 / 無機物質、無機材料化学

学歴

  • 東京大学    

    - 1989年

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    国名: 日本国

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  • 東京大学   工学部   工業化学科

    - 1984年

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    国名: 日本国

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経歴

  • visiting professor,Kumamoto University

    2007年 - 2008年

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  • 熊本大学大学院自然科学研究科 客員教授   Graduate School of Science and Technology

    2007年 - 2008年

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  • 岡山大学   大学院自然科学研究科   教授

    2003年5月 - 現在

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  • - Professor,Graduate School of Natural Science and Technology,Okayama University

    2003年

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  • 東京大学   生産技術研究所   助教授

    1997年7月 - 2003年4月

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  • 東京大学   工学部工業化学科   講師

    1994年1月 - 1997年5月

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  • 東京大学   生産技術研究所   助手

    1989年4月 - 1993年12月

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所属学協会

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委員歴

  • 電気化学会   関西支部幹事  

    2018年4月 - 現在   

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  • 日本化学会   代議員  

    2018年4月 - 現在   

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  • 粉体粉末冶金協会   理事  

    2012年 - 現在   

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  • 化学便覧応用化学編   編集委員会委員  

    2011年 - 2014年   

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  • 日本セラミックス協会   科学技術委員会委員  

    2010年4月   

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  • 日本セラミックス協会   中四国支部理事  

    2008年4月 - 現在   

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  • 賢材研究会   幹事  

    2007年 - 現在   

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    団体区分:学協会

    賢材研究会

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論文

  • Ultrafast Ion Transport via Dielectric Nanocube Interface 査読

    Takashi Teranishi, Ryoji Yamanaka, Ken‐ichi Mimura, Mika Yoneda, Shinya Kondo, Kazumi Kato, Akira Kishimoto

    Advanced Materials Interfaces   2101682 - 2101682   2021年12月

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    担当区分:最終著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Wiley  

    DOI: 10.1002/admi.202101682

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    その他リンク: https://onlinelibrary.wiley.com/doi/full-xml/10.1002/admi.202101682

  • Evaluation of superplastic-foamed zirconia-based ceramics using foaming agent and a superplasticity facilitator derived from rice husk 査読

    Akira Kishimoto, Kentaro Tanaka, Takashi Teranishi

    Journal of Porous Materials   2021年9月

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    担当区分:筆頭著者, 責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Springer Science and Business Media LLC  

    DOI: 10.1007/s10934-021-01156-3

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    その他リンク: https://link.springer.com/article/10.1007/s10934-021-01156-3/fulltext.html

  • Revealing intrinsic electro-optic effect in single domain Pb(Zr, Ti)O3 thin films 査読

    Shinya Kondo, Tomoaki Yamada, Masahito Yoshino, Takashi Teranishi, Akira Kishimoto, Takanori Nagasaki

    Applied Physics Letters   119 ( 10 )   102902 - 102902   2021年9月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:AIP Publishing  

    DOI: 10.1063/5.0056121

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  • Influence of orientation on the electro-optic effect in epitaxial Y-doped HfO2 ferroelectric thin films 査読

    Shinya Kondo, Reijiro Shimura, Takashi TERANISHI, Akira Kishimoto, Takanori Nagasaki, Hiroshi FUNAKUBO, Tomoaki Yamada

    Japanese Journal of Applied Physics   60 ( SF )   2021年7月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP Publishing  

    DOI: 10.35848/1347-4065/ac17e0

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    その他リンク: https://iopscience.iop.org/article/10.35848/1347-4065/ac17e0/pdf

  • Linear electro-optic effect in ferroelectric HfO2-based epitaxial thin films 査読

    Shinya Kondo, Reijiro Shimura, Takashi Teranishi, Akira Kishimoto, Takanori Nagasaki, Hiroshi Funakubo, Tomoaki Yamada

    Japanese Journal of Applied Physics   60 ( 7 )   070905 - 070905   2021年7月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP Publishing  

    DOI: 10.35848/1347-4065/ac087d

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    その他リンク: https://iopscience.iop.org/article/10.35848/1347-4065/ac087d/pdf

  • Ultrafast charge transfer at the electrode−electrolyte interface via an artificial dielectric layer 査読

    Takashi Teranishi, Kaisei Kozai, Sou Yasuhara, Shintaro Yasui, Naoyuki Ishida, Kunihiro Ishida, Masanobu Nakayama, Akira Kishimoto

    Journal of Power Sources   494   229710 - 229710   2021年5月

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    担当区分:最終著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier BV  

    DOI: 10.1016/j.jpowsour.2021.229710

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  • Controlled colossal polarization originating in the Li-ion conductor–dielectric interface 査読

    Takashi Teranishi, Yuki Nishikori, Mika Yoneda, Akira Kishimoto

    Japanese Journal of Applied Physics   60 ( 4 )   040905 - 040905   2021年4月

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    担当区分:最終著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP Publishing  

    DOI: 10.35848/1347-4065/abf088

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    その他リンク: https://iopscience.iop.org/article/10.35848/1347-4065/abf088/pdf

  • Temporary reinforcement of ceria-based ceramics using chemical expansion and concomitant change in electrical properties 査読

    Akira Kishimoto, Naoya Ohmoto, Takashi Teranishi

    Materials Letters   270   127712 - 127712   2020年7月

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    担当区分:筆頭著者, 責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier BV  

    DOI: 10.1016/j.matlet.2020.127712

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  • Influence of Reduction Annealing on the Characteristics of CeO<sub>2</sub> – YSZ Based Oxide Ceramics 査読

    Taiga UMEMURA, Takashi TERANISHI, Akira KISHIMOTO

    Journal of the Japan Society of Powder and Powder Metallurgy   67 ( 3 )   163 - 166   2020年3月

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    担当区分:最終著者, 責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Japan Society of Powder and Powder Metallurgy  

    DOI: 10.2497/jjspm.67.163

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  • Domain contribution to the aging characteristics in BaTiO3 ceramics 査読

    Takashi Teranishi, Seiichiro Azuma, Akira Kishimoto

    Japanese Journal of Applied Physics   58 ( SL )   SLLC03 - SLLC03   2019年11月

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    担当区分:最終著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP Publishing  

    DOI: 10.7567/1347-4065/ab39f4

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    その他リンク: http://iopscience.iop.org/article/10.7567/1347-4065/ab39f4/pdf

  • Exploring of Novel Functions in Ceramics Utilizing Some Selective Improvements of Ion Movement under Millimeter-wave Irradiation 査読

    Akira KISHIMOTO

    Journal of the Japan Society of Powder and Powder Metallurgy   66 ( 2 )   73 - 79   2019年2月

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    担当区分:筆頭著者, 最終著者, 責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Japan Society of Powder and Powder Metallurgy  

    DOI: 10.2497/jjspm.66.73

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  • Utilizing Rice Husk for Ceramic and Glass Foams as Matrix and Foaming Agent 査読

    Chiaki MATSUOKA, Takashi TERANISHI, Hidetaka HAYASHI, Akira KISHIMOTO

    Journal of the Japan Society of Powder and Powder Metallurgy   65 ( 8 )   475 - 480   2018年8月

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    担当区分:最終著者, 責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Japan Society of Powder and Powder Metallurgy  

    DOI: 10.2497/jjspm.65.475

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  • Aluminum Interdiffusion into LiCoO2 Using Atomic Layer Deposition for High Rate Lithium Ion Batteries 査読

    Takashi Teranishi, Yumi Yoshikawa, Mika Yoneda, Akira Kishimoto, Jennifer Halpin, Shane O’Brien, Mircea Modreanu, Ian M. Povey

    ACS Applied Energy Materials   1 ( 7 )   3277 - 3282   2018年7月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:American Chemical Society (ACS)  

    DOI: 10.1021/acsaem.8b00496

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  • Low‐Temperature High‐Rate Capabilities of Lithium Batteries via Polarization‐Assisted Ion Pathways 査読

    Takashi Teranishi, Naoto Katsuji, Keisuke Chajima, Sou Yasuhara, Masahiro Inohara, Yumi Yoshikawa, Shintaro Yasui, Hidetaka Hayashi, Akira Kishimoto, Mitsuru Itoh

    Advanced Electronic Materials   4 ( 4 )   1700413   2018年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Domain engineering enhanced microwave tunability in nonstoichiometric Ba0.8 Sr0.2 TiO3 査読

    Takashi Teranishi, Koji Osaki, Hidetaka Hayashi, Akira Kishimoto

    Journal of the American Ceramic Society   101 ( 2 )   723 - 731   2018年2月

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    担当区分:最終著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Wiley  

    Domain engineering via oxygen vacancy, VO loading achieved by A/B modification as well as quenching treatment, was utilized for Ba0.8Sr0.2TiO3 (0.8 BSTs) in an attempt to enhance the microwave tunable characteristics. For similar grain sizes, the domain sizes were notably reduced for all nonstoichiometric BSTs, indicating that the loaded VO.. (as a consequence of Ti defects, VTi) played a role in the nuclei for new domain walls. The tunability T at 100 MHz under a direct current field of 30 V/20 m increased steadily as the domain size (d.s.) declined for all BSTs, regardless of the A/B ratio, due to the d.s. effect. The tunable characteristics in nonstoichiometric BSTs having a similar d.s. of 190 nm were then compared. The tunability and tan decreased for A/B = 1.002 (0.2 mol% Ti defects). The introduced VO.. formed pinning centers that restricted domain wall motion, leading directly to lower tunability and smaller dielectric loss. However, VO..-overloaded samples (i.e., A/B 1.005) exhibited increased values for tan due to VO.. conduction in the domains. The quench treatment of 0.8 BST (with A/B = 1.002) samples resulted in a d.s. reduction from 191 to 170 nm. These quenched specimens showed greater tunability, T-total, originating from the strengthened dipole contribution, T-dipole, as a consequence of the d.s. effect. The tan of the quenched specimens was essentially unchanged, indicating a homogenous VO.. distribution via the quench, effectively reducing the mobile VO.. (which contributes to electrical conduction) in the domains. Consequently, the achieved figure of merit via domain engineering was 2.25 at 100 MHz for the quenched BST with A/B = 1.002, which was 1.54 times larger than that of unmodified BST.

    DOI: 10.1111/jace.15242

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  • Synthesis of nano-crystalline LiNbO3-decorated LiCoO2 and resulting high-rate capabilities 査読

    Teranishi Takashi, Inohara Masahiro, Kano Jun, Hayashi Hidetaka, Kishimoto Akira, Yoda Koji, Motobayashi Hidefumi, Tasaki Yuzo

    SOLID STATE IONICS   314   57 - 60   2018年1月

  • Millimeter-wave irradiation heating for operation of doped CeO 2 electrolyte-supported single solid oxide fuel cell 査読

    Salmie Suhana Binti Che Abdullah, Takashi Teranishi, Hidetaka Hayashi, Akira Kishimoto

    Journal of Power Sources   374   92 - 96   2018年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier BV  

    High operation temperature of solid oxide fuel cell (SOFC) results in high cell and operation cost, time consuming and fast cell degradation. Developing high performance SOFC that operates at lower temperature is required. Here we demonstrate 24 GHz microwave as a rapid heating source to replace conventional heating method for SOFC operation using 20 mol% Sm doped CeO2 electrolyte-supported single cell. The tested cell shows improvement of 62% in maximum power density at 630 °C under microwave heating. This improvement governs by bulk conductivity of the electrolyte. Investigation of ionic transference number reveals that the value is unchanged under microwave irradiation, confirming the charge carrier is dominated by oxygen ion species. This work shows a potential new concept of high performance as well as cost and energy effective SOFC.

    DOI: 10.1016/j.jpowsour.2017.11.036

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  • Effect of Millimeter-wave Irradiation Heating on the Ionic Conductivity of LaGaO<sub>3</sub> Based Ceramics 査読

    Yume KUDO, Yuri FUJII, Hideki HASUNUMA, Takashi TERANISHI, Hidetaka HAYASHI, Akira KISHIMOTO

    Journal of the Japan Society of Powder and Powder Metallurgy   65 ( 1 )   21 - 25   2018年

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    担当区分:責任著者   掲載種別:研究論文(学術雑誌)  

    DOI: 10.2497/jjspm.65.21

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  • Loading effect of a barium titanate artificial interface on high voltage capabilities at high charge and discharge rates 査読

    Yumi Yoshikawa, Takashi Teranishi, Hidetaka Hayashi, Akira Kishimoto

    JAPANESE JOURNAL OF APPLIED PHYSICS   56 ( 10 )   4950 - 4959   2017年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    Cyclic characteristics of BaTiO3 (BT)-decorated LiCoO2 (LC), for use as an artificial solid electrolyte interface (SEI) were evaluated at high voltages. Within the standard voltage window (i.e., 3.3-4.2 V), the BT-decorated LC exhibited greater capacities for up to 80 cycles compared with both the Al2O3 (paraelectric)-decorated and bare LC SEIs. The discharge capacity retention after 80 cycles (compared with the initial value) was 86.0% for the BT-LC cathode. This is a significant improvement over both the bare LC that showed 19.9% retention and the Al2O3-LC that displayed 71.5% retention. Thereafter, the cyclic stabilities of the BT-LC and bare LC were compared within potential windows at cutoff voltages as high as 4.9 V. In this region, BT decoration yielded marked improvements in capacity retention after 50 cycles, up to a potential of 4.7V. The post-situ XRD analysis of the cathode sheets showed that BT decoration effectively stabilized the hexagonal crystal structure of the LC, H1, resulting in the said cyclic stability increase. These observations demonstrate that the use of BT in SEI allows a significant increase in working voltage while maintaining the chemical stability of the underlying LC matrix, a key advancement in the perpetual pursuit of ever higher cell energy densities. (C) 2017 The Japan Society of Applied Physics

    DOI: 10.7567/JJAP.56.10PC01

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  • Electrodeposition of Ni-Al(OH)<sub>3</sub> Composite Films from NO<sub>3</sub><sup>-</sup> Containing Non-Suspended Bath 査読

    Toru ASANO, Hidetaka HAYASHI, Takashi TERANISHI, Akira KISHIMOTO, Kazuya ISHII

    Journal of The Surface Finishing Society of Japan   68 ( 7 )   401 - 404   2017年7月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:The Surface Finishing Society of Japan  

    DOI: 10.4139/sfj.68.401

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  • Polarization behavior of sol-gel-derived relaxor Ba(Zr, Ti)O3 films 査読

    Takashi Teranishi, Shin Kajiyama, Hidetaka Hayashi, Akira Kishimoto

    Journal of the American Ceramic Society   100 ( 4 )   1542 - 1550   2017年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Wiley  

    Films of the relaxor ferroelectric BaZr0.25Ti0.75O3 (0.25-BZT) were synthesized via a sol-gel route to investigate the effect of film thickness on the dielectric properties and for comparison with normal ferroelectric BaTiO3 (BT). The as-prepared films on Nb-doped SrTiO3 (Nb-ST) displayed a (100) orientation; thinner films had stronger (100) orientations. Microwave dielectric measurements up to a few GHz quantified the polarizations, that is, the dipole contribution, epsilon(dipole), the combination of the ionic and electronic polarizations, epsilon(ionic+el.), and the total contribution, epsilon(total). The epsilon(dipole) in the relaxors at a film thickness of t=630nm was 360, which was double that for the normal ferroelectric BT (epsilon(dipole)=180) at t=735nm. The larger apparent permittivity of the BZT therefore originated from the larger epsilon(dipole) of the polar nanoregions (PNRs), while the nanograins of BT with few domain walls led to a comparably smaller epsilon(dipole). The volume ratio of the surface and film-substrate interface lacking the dipole interactions increased with the reduction in the film thickness, leading to the significant depression in the permittivity for both specimens. The difference in the thickness dependence of the dielectric properties of the sol-gel derived relaxor BZT and the normal ferroelectric BT films was attributed to the different origins of their dipole contribution, that is, the PNRs and ferroelectric domains, respectively.

    DOI: 10.1111/jace.14768

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  • Effect of the (Ba plus Sr)/Ti ratio on the microwave-tunable properties of Ba0.6Sr0.4TiO3 ceramics 査読

    Takashi Teranishi, Riku Kanemoto, Hidetaka Hayashi, Akira Kishimoto

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   100 ( 3 )   1037 - 1043   2017年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY  

    The impact of the (Ba + Sr)/Ti (A/B) ratio on the microwave-tunable characteristics of diffuse phase transition (DPT) ferroelectric Ba0.6Sr0.4TiO3 (0.6-BST) ceramics was investigated. The reduction in the lattice constant with increasing nonstoichiometry was attributed to introduced partial Schottky defects, i.e., [V ''''(Ti) - 2V(O)(center dot center dot)](x) and [V ''(Ba,Sr) - V-O(center dot center dot)](x). The magnitude of the dielectric constant, epsilon', at room temperature in the absence of an applied electric field was governed by the shift in the dielectric maximum temperature, T-m, because T-m was close to room temperature for the 0.6-BST. The dielectric loss, tan delta, diminished as the epsilon' decreased for 0.98 &lt;= A/B &lt;= 1.05, while the tand was much higher for A/B=0.95 having the greatest A-site vacancy loading. The negatively charged V ''(Ba) and V ''(Sr) were mainly compensated by oxygen vacancies and likely partly compensated by holes, h(center dot), which contributed to the electrical conduction. The tunability, T, at 100 MHz was almost constant at 20%-25% for A/B &gt;= 1.00 despite the reduction of the epsilon', whereas T decreased for A/B&lt;1.00 to ca. 10% for A/B=0.95 having the greatest A- site vacancy loading. The results implied that the [V ''''(Ti) - 2V(O)(center dot center dot)](x) for larger A/B values was more efficient in generating nucleation sites in the polar nanoregions (PNRs) than the [V ''(Ba,Sr) - V-O(center dot center dot)](x) for smaller A/B values, thereby providing greater dipole polarization. Consequently, the figure of merit, FOM, reached its maximum of 250 at A/B=0.9875, which was ca. 155% higher than that of the stoichiometric BST.

    DOI: 10.1111/jace.14700

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  • Enhanced electrical conductivity of doped CeO2 under millimeter-wave irradiation heating 査読

    Salmie Suhana Binti Che Abdullah, Takashi Teranishi, Hidetaka Hayashi, Akira Kishimoto

    MATERIALS & DESIGN   115   231 - 237   2017年2月

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    担当区分:最終著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCI LTD  

    The electrical conductivity of promising candidates for intermediate temperature solid oxide fuel cell (IT-SOFC) electrolyte; 10-25 mol% gadolinium or samarium-doped CeO2 was measured through impedance measurement under millimeter-wave irradiation heating. Conductivity value for all samples was found to be higher when measured under millimeter-wave irradiation heating than that measured under conventional heating. Results from activation energy show that energy for cation-vacancy dissociation was largely affected bymillimeter-wave irradiation, where significant reduction was observed, thus improved the conduction process. Possibility of contribution from non-thermal ponderomotive force in conduction process was discussed. (C) 2016 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.matdes.2016.11.051

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  • Rate characteristics of barium titanata-lithium cobaltate composites investigated at voltages reaching 4.9V 査読

    Yumi Yoshikawa, Takashi Teranishi, Hidetaka Hayashi, Akira Kishimoto

    Japanese Journal of Applied Physics   56   10PC01   2017年

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    担当区分:最終著者  

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  • Performance improvement of a high-temperature stress sensor incorporated with flat pores through a solid state foaming method 査読

    Yuuki Takamuro, Takashi Teranishi, Hidetaka Hayashi, Akira Kishimoto

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy, journal of the japan society of powder and powder metallurgy, Journal of the Japan Society of Powder and Powder Metallurgy   64 ( 2 )   68 - 72   2017年

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    担当区分:責任著者  

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  • Relationship between thermal environment and conductivity enhancement under millimeter-wave irradiation heating of zirconia ceramics 査読

    Akira Kishimoto, Koyo Shimoyama, Takashi Teranishi, Hidetaka Hayashi

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   125 ( 10 )   717 - 720   2017年

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

    Improving the conductivity of 8 mol% yttria-stabilized zirconia (8YSZ) electrolyte has enabled a lowering of the operating temperature of solid oxide fuel cells. We previously reported that millimeter-wave irradiation heating increases the ionic conductivity of ceramics. The ionic conductivity of 8YSZ under millimeter-wave irradiation heating had been up to 20 times higher than that with conventional heating. In the present study, we investigated the optimal thermal environment for millimeter-wave irradiation heating. We also investigated the thermal profile of samples under millimeter-wave irradiation heating to elucidate the rate of the non-thermal effect. (C) 2017 The Ceramic Society of Japan. All rights reserved.

    DOI: 10.2109/jcersj2.17056

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  • High rate capability of a BaTiO3-decorated LiCoO2 cathode prepared via metal organic decomposition 査読

    Takashi Teranishi, Naoto Katsuji, Yumi Yoshikawa, Mika Yoneda, Hidetaka Hayashi, Akira Kishimoto, Koji Yoda, Hidefumi Motobayashi, Yuzo Tasaki

    JAPANESE JOURNAL OF APPLIED PHYSICS   55 ( 10 )   2016年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    Metal organic decomposition (MOD) using octylic acid salts was applied to synthesize a BaTiO3-LiCoO2 (BT-LC) composite powder. The Ba and Ti octylates were utilized as metal precursors, in an attempt to synthesize homogeneous BT nanoparticles on the LC matrix. The BT-LC composite, having a phase-separated composite structure without any impurity phase, was successfully obtained by optimizing the MOD procedure. The composite prepared using octylate precursors exhibited a sharper distribution and better dispersibility of decorated BT particles. Additionally, the average particle size of the decorated BTs using metal octylate was reduced to 23.3 nm, compared to 44.4nm from conventional processes using Ba acetate as well as Ti alkoxide as precursors. The composite cathode displayed better cell performance than its conventional counterpart; the discharge capacity of the metal octylate-derived specimen was 55.6mAh/g at a 50C rate, corresponding to 173% of the capacity of the conventional specimen (32.2mAh/g). The notable improvement in high rate capability obtained in this study, compared with the conventional route, was attributed to the higher density of the triple junction formed by the BT-LC-electrolyte interface. (C) 2016 The Japan Society of Applied Physics

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  • Influence of PMSA-based polymer on the settling velocity of CNT in Aqueous Media 査読

    Naoyuki Nishimura, Shin-Ichi Takeda, Takashi Teranishi, Hidetaka Hayashi, Naoto Saito, Akira Kishimoto

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   63 ( 10 )   861 - 865   2016年9月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of the Japan Society of Powder and Powder Metallurgy  

    The preparation of a stable suspension dispersing carbon nanotube (CNT) in aqueous media using polystyrene maleic acid (PSMA)-based polymer as surfactant was attempted to be subsequently used in the fabrication of high-performance ceramic matrix composites. Settling velocity under centrifugation analysis was experimentally evaluated as one of the stability criteria of the dispersion and pulsed nuclear magnetic resonance was used to evaluate the amount of adsorbed molecules. The settling velocity decreased considerably with the PSMA concentration up to the saturation at around 7 mass%, then further decreased gradually with PSMA. The former was thought to be based on the dissociation of CNT agglomerate and the latter would be attributed to the surfactant-induced network structure formed in the aqueous media.

    DOI: 10.2497/jjspm.63.861

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  • High rate capability of a BaTiO

    Teranishi Takashi, Katsuji Naoto, Yoshikawa Yumi, Yoneda Mika, Hayashi Hidetaka, Kishimoto Akira, Yoda Koji, Motobayashi Hidefumi, Tasaki Yuzo

    Jpn. J. Appl. Phys.   55 ( 10 )   10TB01   2016年8月

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    記述言語:英語   出版者・発行元:Institute of Physics  

    Metal organic decomposition (MOD) using octylic acid salts was applied to synthesize a BaTiO<inf>3</inf>–LiCoO<inf>2</inf>(BT–LC) composite powder. The Ba and Ti octylates were utilized as metal precursors, in an attempt to synthesize homogeneous BT nanoparticles on the LC matrix. The BT–LC composite, having a phase-separated composite structure without any impurity phase, was successfully obtained by optimizing the MOD procedure. The composite prepared using octylate precursors exhibited a sharper distribution and better dispersibility of decorated BT particles. Additionally, the average particle size of the decorated BTs using metal octylate was reduced to 23.3 nm, compared to 44.4 nm from conventional processes using Ba acetate as well as Ti alkoxide as precursors. The composite cathode displayed better cell performance than its conventional counterpart; the discharge capacity of the metal octylate-derived specimen was 55.6 mAh/g at a 50C rate, corresponding to 173% of the capacity of the conventional specimen (32.2 mAh/g). The notable improvement in high rate capability obtained in this study, compared with the conventional route, was attributed to the higher density of the triple junction formed by the BT–LC–electrolyte interface.

    DOI: 10.7567/JJAP.55.10TB01

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  • Grain size-sensitive viscoelastic relaxation and seismic properties of polycrystalline MgO 査読

    A. Barnhoorn, I. Jackson, J. D. Fitz Gerald, A. Kishimoto, K. Itatani

    JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH   121 ( 7 )   4955 - 4976   2016年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER GEOPHYSICAL UNION  

    Torsional forced-oscillation experiments on a suite of synthetic MgO polycrystals, of high-purity and average grain sizes of 1-100 mu m, reveal strongly viscoelastic behavior at temperatures of 800-1300 degrees C and periods between 1 and 1000s. The measured shear modulus and associated strain energy dissipation both display monotonic variations with oscillation period, temperature, and grain size. The data for the specimens of intermediate grain size have been fitted to a generalized Burgers creep function model that is also broadly consistent with the results for the most coarse-grained specimen. The mild grain size sensitivity for the relaxation time (L), defining the lower end of the anelastic absorption band, is consistent with the onset of elastically accommodated grain boundary sliding. The upper end of the anelastic absorption band, evident in the highest-temperature data for one specimen only, is associated with the Maxwell relaxation time (M) marking the transition toward viscous behavior, conventionally ascribed a stronger grain size sensitivity. Similarly pronounced viscoelastic behavior was observed in complementary torsional microcreep tests, which confirm that the nonelastic strains are mainly recoverable, i.e., anelastic. With an estimated activation volume for the viscoelastic relaxation, the experimentally constrained Burgers model has been extrapolated to the conditions of pressure and temperature prevailing in the Earth's uppermost lower mantle. For a plausible grain size of 10mm, the predicted dissipation Q(-1) ranges from similar to 10(-3) to similar to 10(-2) for periods of 3-3000s. Broad consistency with seismological observations suggests that the lower mantle ferropericlase phase might account for much of its observed attenuation.

    DOI: 10.1002/2016JB013126

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  • Gastight, closed pore inclusive porous ceramics through a superplastically foaming method 査読

    Akira Kishimoto, Atsuki Tohji, Takashi Teranishi, Hidetaka Hayashi

    Ceramic for Environmental Systems   257   69 - 79   2016年5月

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    記述言語:英語   掲載種別:論文集(書籍)内論文   出版者・発行元:Wiley Blackwell  

    Our innovative superplastically foaming method was used to create closed-pore inclusive zirconia-based ceramics. Yttrium oxide was added to monoclinic zirconia to stabilize the matrix. Sintering and superplastic deformation were used to form a solid solution and transform it to a cubic phase. Porous ceramics formed via this post-stabilization method exhibited anomalous thermal expansion due to the silica derived from the foaming agent SiC. This anomalous thermal expansion disappeared following substitution of the SiC foaming agent for AlN. The resulting superplastically foamed porous ceramics exhibited large thermal conductivities, comparable to that of the fully densified ceramics, but with a porosity as great as 35%. This high thermal conductivity was attributed to the alumina derived from the foaming agent AlN. To suppress the formation of alumina, the samples were pre-sintered in an argon atmosphere. The modified superplastically foamed ceramics exhibited smaller pores, with a porosity of 33%, as well as favorable thermal insulation, with a thermal conductivity that was approximately half that of the fully dense material.

    DOI: 10.1002/9781119234463.ch7

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  • Lithium ion conductivity of oriented Li0.33La0.56TiO3 solid electrolyte films prepared by a sol-gel process 査読

    Takashi Teranishi, Yuki Ishii, Hidetaka Hayashi, Akira Kishimoto

    SOLID STATE IONICS   284   1 - 6   2016年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Lithium lanthanum titanates (Li3xLa2/3 - xTiO3, LLTOs) having a-axis orientations were synthesized via a simple sol-gel route on SrTiO3 and Nb-doped SrTiO3 substrates. The lithium ion conduction behaviors of the LLTO films were determined. Annealing the films above 1200 degrees C yielded strong a-axis growth orientation, while heating samples above 1300 degrees C led to the reduction of the Li transference number, T-Li, which was attributed to Li evaporation. The optimized annealing temperature was 1200 degrees C, where both the bulk conductivity, sigma(dc) and the T-Li exhibited their maxima. The bulk conductivity was 4.42 x 10(-5) S/cm for a 411-nm-thick film, which was almost 10-times-higher than that previously reported for sol-gel-derived films. A key reason for the enhancement in conductivity is the expanded bottleneck of the LLTO lattice because of a tensile stress induced by the substrate. Optimization of the annealing temperature and the film thickness further improved the conductivity. (C) 2015 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.ssi.2015.11.029

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  • Electrical conductivity of ceria-based oxide under 24 GHz millimeter-wave heating in varying thermal environments 査読

    Salmie. S.C. Abdulla, T. Teranishi, H. Hayashi, A. Kishimoto

    J. Jpn. Soc. Powder Powder Metallurgy   63 ( 7 )   663 - 667   2016年

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    担当区分:最終著者, 責任著者  

    DOI: 10.2497/jjspm.63.663

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  • In situ time-resolved dispersive X-ray absorption fine structure analysis of BaTiO<sub>3</sub>&ndash;LiCoO<sub>2</sub> composites for lithium ion batteries 査読

    Takashi TERANISHI, Yumi YOSHIKAWA, Ryota MIYAHARA, Hidetaka HAYASHI, Akira KISHIMOTO, Misaki KATAYAMA, Yasuhiro INADA

    Journal of the Ceramic Society of Japan   124 ( 6 )   659 - 663   2016年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Ceramic Society of Japan  

    In this study, in situ time-resolved dispersive X-ray absorption fine structure (DXAFS) analysis of BaTiO3-LiCoO2 (BT-LC) composites for lithium ion batteries was performed to characterize the cobalt ion valence shift between oxidized and reduced states of driven cells, in an attempt to better understand the contribution of ferroelectric solid electrolyte interfaces (SEIs) to charge-discharge rates. Two types of artificial SEIs, ferroelectric BT and paraelectric Al2O3, were compared. The magnitude of the shift in the X-ray absorption energy at the peak of the white line, E-1, during charging and discharging at a 10C rate, increased in the order of bare LC (0.264 eV) &lt; Al2O3 1 mol% (0.497 eV) &lt; BT 1 mol% (1.15 eV); the corresponding discharge capacities of the laminated cells at 10C were as follows: bare LC (11.6mAh/g) &lt; Al2O3 (41.8mAh/g) &lt; BT (95.1mAh/g). The increase in E1, i.e., the oxidation of Co during charging, intensified under a higher applied potential for the BT-decorated composite compared with that of the Al2O3-coated specimen. The stronger oxidation of Co for BT-LC under application of a large electric field was attributed to the strengthened polarization due to the larger permittivity of BT. (C) 2016 The Ceramic Society of Japan. All rights reserved.

    DOI: 10.2109/jcersj2.16009

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  • Influence of Millimeter-wave Irradiation on the Cation Interdiffusion of Ceria/Zirconia Ceramic Couple 査読

    Mikiya WAKIMOTO, Takashi TERANISHI, Hidetaka HAYASHI, Akira KISHIMOTO

    63 ( 11 )   981 - 985   2016年

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    担当区分:最終著者, 責任著者   掲載種別:研究論文(学術雑誌)  

    DOI: 10.2497/jjspm.63.981

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  • Influence of PMSA-Based Polymer on the Settling Velocity of CNT in Aqueous Media 査読

    Naoyuki Nishimura, Shin-ichi Takeda, Takashi Teranishi, Hidetaka Hayashi, Naoto Saito, Akira Kishimoto

    MATERIALS TRANSACTIONS   56 ( 12 )   2006 - 2009   2015年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN INST METALS  

    The preparation of a stable suspension dispersing carbon nanotube (CNT) in aqueous media using polystyrene maleic acid (PSMA)-based polymer as surfactant was attempted to be subsequently used in the fabrication of high-performance ceramic matrix composites. Settling velocity under centrifugation analysis was experimentally evaluated as one of the stability criteria of the dispersion and pulsed nuclear magnetic resonance was used to evaluate the adsorbed molecules. The settling velocity decreased considerably with the PSMA concentration up to the saturation at around 7 mass%, then further decreased gradually with PSMA. The former was thought to be based on the dissociation of CNT agglomerate and the latter would be attributed to the surfactant-induced network structure fanned in the aqueous media.

    DOI: 10.2320/matertrans.Y-M2015828

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  • Stabilisation dopant-dependent facilitation in ionic conductivity on millimeter-wave irradiation heating of zirconia-based ceramics 査読

    Akira Kishimoto, Hideki Hasunuma, Takashi Teranishi, Hidetaka Hayashi

    JOURNAL OF ALLOYS AND COMPOUNDS   648   740 - 744   2015年11月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    Ionic conductivity was measured on scandia-, calcia-, and gadolinia-stabilised zirconia ceramics under quasi-millimeter-wave (MMW) irradiation heating and conventional heating. Conductivity enhancement was evaluated for these ceramics and compared with our previous report on yttria- and ytterbia-stabilised zirconia ceramics (YSZ and YbSZ, respectively). The ionic conduction for the various cation-substituted zirconia ceramics was enhanced under MMW irradiation heating. In the case of scandia-stabilisation, the optimal composition demonstrating maximum ionic conductivity was 12-mol% zirconia (ScSZ) under MMW irradiation heating, which was larger than under conventional heating. Such an optimal composition shift was similar to results for YSZ ceramics. These results are discussed in terms of the activation energies for vacancy-ion dissociation and ion transfer. (C) 2015 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jallcom.2015.07.057

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  • In situ impedance analysis on BaTiO3-LiCoO2 composite cathodes for lithium ion batteries 査読

    Takashi Teranishi, Yumi Yoshikawa, Ryo Sakuma, Hirokazu Okamura, Hidetaka Hayashi, Akira Kishimoto, Yasuo Takeda

    JAPANESE JOURNAL OF APPLIED PHYSICS   54 ( 10 )   2015年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    In situ electrochemical impedance spectroscopy (EIS) was undertaken to investigate the contribution of a ferroelectric artificial solid electrolyte interface (SEI) to the enhancement of the rate capability of lithium ion batteries. Resistance elements, consisting of the cell reactions, the resistance of the electrolyte, R-sol, that of the Li metal anode reaction, R-Li, and the charge transfer resistance, R-ct, were measured. A small ferroelectric BaTiO3 (BT) load, similar to 1 mol %, notably reduced R-ct and R-sol compared with bare LiCoO2 (LC), indicating that loaded ferroelectric BT SEIs effectively promote Li inter/deintercalation into and from the active material, LC, and restrict cobalt ion dissolution into the electrolyte liquid. Lower R-ct and R-sol resulted in a significantly higher capacity retention ratio at a 10C rate compared with the initial cycle for small BT load, similar to 1 mol %. The capacity retention dropped rapidly, accompanied by a slight increase in R-ct for larger BT loads, 5 and 15 mol %, which may be attributed to the thicker BT layer and the existence of the impurity phase, BaCO3. These results imply that the ferroelectric SEI affected the kinetics of mobile Li ions at the cathode-electrolyte interface, significantly enhancing the rate capability. (C) 2015 The Japan Society of Applied Physics

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  • Effect of 24 GHz microwave heating on creep deformation of yttria partially stabilised zirconia ceramics with titania and tin oxide additives 査読

    Akira Kishimoto, Kyohei Yamashita, Takashi Teranishi, Hidetaka Hayashi, Saburo Sano

    CERAMICS INTERNATIONAL   41 ( 4 )   5785 - 5789   2015年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCI LTD  

    The effect of quasi-millimetre-wave (24 GHz microwave) heating on creep deformation was investigated on partially-stabilised zirconia through tensile testing at temperatures from 1100 to 1350 degrees C over stresses from 5 to 10 MPa. The specimens were fabricated by sintering the 3 mol% of yttria stabilised ZrO2 (3YSZ) powder dispersed with SiO2, SiO2/SnO2 or SiO2/TiO2 at 1600 degrees C. In tensile test using the quasi-millimetre wave heating, strain rates of SiO2 dispersed 3YSZ were similar to that with a conventional furnace heating. The 3YSZ sample containing the TiO2 addition exhibited a different strain rate when heated by millimeter-wave irradiation as against conventional furnace heating, it is proposed that this difference can be explained due to TiO2 having a high-dielectric constant resulting in a non-thermal effect when subjected to quasi-millimeter wavelength radiation. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

    DOI: 10.1016/j.ceramint.2015.01.006

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  • Effect of Mg Loading on the High-frequency Tunability of Ba0.8Sr0.2TiO3 Ceramics

    Takashi Teranishi, Tsuyoshi Sogabe, Hidetaka Hayashi, Akira Kishimoto, Kengo Iokibe, Yoshitaka Toyota

    Japanese Journal of Applied Physics   54 ( 1 )   11502-1-011502-6   2015年

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  • High-Rate Capabilities of Ferroelectric BaTiO3-LiCoO2 Composites with Optimized BaTiO3 Loading for Li-Ion Batteries 査読

    Takashi Teranishi, Yumi Yoshikawa, Ryo Sakuma, Hirokazu Okamura, Hideki Hashimoto, Hidetaka Hayashi, Tatsuo Fujii, Akira Kishimoto, Yasuo Takeda

    ECS ELECTROCHEMISTRY LETTERS   4 ( 12 )   A137 - A140   2015年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELECTROCHEMICAL SOC INC  

    Ferroelectric barium titanate, BaTiO3 (BT) was coated on lithium cobaltate, LiCoO2 (LC), as an artificial solid electrolyte interface (SEI), via the simple sol-gel route. The high charge-discharge rate capabilities of the composite cathodes were evaluated up to 10C. The LC loaded with 1 mol% of BT had a measured capacity of 146 mAh/g, which was the highest value measured at 10C. This capacity was 78% of its initial value, and was 238% of the capacity of bare LC over the same number of cycles. (C) 2015 The Electrochemical Society. All rights reserved.

    DOI: 10.1149/2.0041512eel

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  • Dependence of the conductivity of polycrystalline Li0.33BaxLa0.56-2/3xTiO3 on Ba loading 査読

    Takashi Teranishi, Akane Kouchi, Hidetaka Hayashi, Akira Kishimoto

    SOLID STATE IONICS   263   33 - 38   2014年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    The dependence of lithium ion conductivity on barium loading was investigated for Li0.33BaxLa0.56-2/3xTiO3 (LBLT, 0 &lt;= x &lt;= 0.1) ceramics. The highest bulk conductivity, sigma(dc), of 1.24 x 10(-3) S cm(-1) obtained for 0.25 mol.% Ba loading was slightly improved compared to that of non-doped Li0.33La0.56TiO3 (1.18 x 10(-3) S cm(-1)). The intensities of the XRD patterns in the independent cubic and tetragonal reflections, i.e., I-c(100) and I-t(101), were analyzed; a larger I-c(100)/I-t(101) ratio corresponded to a larger sigma(dc). A possible reason for the only slight enhancement of the sigma(dc) by a small loading of Ba is an increased volume fraction of the more highly conductive LBLT cubic phase. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.ssi.2014.05.001

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  • Microwave Absorbency Change of Nitride Powders under Vacuum Heating 査読

    Saburo Sano, Sadatsugu Takayama, Akira Kishimoto

    Advances in Science and Technology   88   31 - 36   2014年10月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Trans Tech Publications, Ltd.  

    We measured the microwave and millimeter-wave behaviors of ceramics and metal powders as a basis for developing microwave and millimeter-wave heating technology. In this study, nitride powders were subjected to microwave absorption measurements at elevated temperature. These measurements were performed using a system comprising a vector network analyzer, a circular wave-guide fixture, and a vacuum furnace. The sample’s microwave absorbency was evaluated by the change in reflection power from the sample in the circular wave-guide fixture under vacuum heating. Measurements were performed at approximately 24 GHz and at temperature up to approximately 1100°C. Boron nitride (BN) exhibited almost no absorption of microwaves up to 1100°C, similar to the results of a low-loss oxide powder such as alumina. Dichromium mononitride (Cr2N) powder exhibited a rather high absorption of microwaves at room temperature. During vacuum heating, absorbency of Cr2N started to decrease at 300°C, and became almost zero at temperature greater than 600°C, similar to the behavior of iron powder. This result indicated that roughly packed Cr2N powder absorbs microwave radiation; however, during vacuum heating, the compact body was sintered and the whole sample body became a reflector of microwaves. This change was irreversible, and the sample maintained its reflection behavior upon the cooling. When a mixed powder of Cr2N (20 mass%) and Al2O3 was heated under vacuum, the compact sample exhibited microwave absorption that increased with increasing temperature. This change was reversible upon cooling. These results indicated that the mixed powder did not become reflector of microwaves; Cr2N particles were not electrically connected each other because the Al2O3 particles kept the Cr2N particles separate during the vacuum heating process.

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  • High-rate performance of ferroelectric BaTiO3-coated LiCoO2 for Li-ion batteries 査読

    Takashi Teranishi, Yumi Yoshikawa, Ryo Sakuma, Hideki Hashimoto, Hidetaka Hayashi, Akira Kishimoto, Tatsuo Fujii

    APPLIED PHYSICS LETTERS   105 ( 14 )   2014年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER INST PHYSICS  

    The high charge-discharge rate characteristics of composite cathodes consisting of ferroelectric BaTiO3 (BT)-coated LiCoO2 (LC), synthesized via a simple sol-gel route, were evaluated, and the rate showed stepwise increases to as high as 5C. The LC-BT composite cathode annealed at 600 degrees C, LC-BT-600, notably retained high capacities, i.e., 122 mAh/g at 30 cycles, 5C and 99 mAh/g at 60 cycles, 5C. These capacities corresponded to 83% and 67% of the initial values and were as high as 158% and 245% of the capacities of bare LC over the same cycles, respectively. The ferroelectricity of the coated BT contributed to the improvement in high-rate performance. (c) 2014 AIP Publishing LLC.

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  • The isothermal conductivity improvement in zirconia-based ceramics under 24 GHz microwave heating 査読

    Akira Kishimoto, Keiko Ayano, Takashi Teranishi, Hidetaka Hayashi

    MATERIALS CHEMISTRY AND PHYSICS   143 ( 2 )   486 - 489   2014年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    Under 24-GHz millimetre-wave irradiation heating ionic conductivity of zirconia base ceramics was up to 20 times higher than that of a conventionally-heated sample at the same temperature of 400 degrees C. The degree of enhancement could be altered by changing the stabilising atom from Y to Yb. Enhancement of ionic conduction was prominent in the setup condition of larger self-heating ratio and larger MMW absorbing materials. The isothermal improvement of ionic conductivity under MMW irradiation would be ascribed to the non-thermal effect. (C) 2013 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.matchemphys.2013.10.002

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  • Relationship Between Phonon Parameters and Oxygen Ion Conductivity for Al-Yb Co-doped Zirconia 査読

    Takashi Teranishi, Nami Matsubara, Hidetaka Hayashi, Akira Kishimoto

    ELECTROCERAMICS IN JAPAN XVI   582   107 - 110   2014年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:TRANS TECH PUBLICATIONS LTD  

    The relationship between the optical phonon parameters and the oxygen ion conductivities were investigated for Al-Yb co-doped zirconia ceramics. Intrinsic intragrain ion conductivity, sigma(dc) decreased with increasing Al loading into ytterbia-stabilized zirconia, while the damping parameter of the lattice vibration, gamma(1TO), increased. This phenomenon agreed with findings of our previous study, which revealed a relationship between the sigma(dc), and the gamma(1TO) for zirconia-based ion conductors.

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  • Maintaining the mechanical strength of La-, Y-co-substituted zirconia porous ceramics through the superplastically foaming method 査読

    Akira Kishimoto, Masanori Okada, Takashi Teranishi, Hidetaka Hayashi

    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   581   98 - 103   2013年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    The superplastically foaming method was adopted to make closed-pore inclusive zirconia-based ceramics. Lanthanum oxide was added to monoclinic or tetragonal yttria-stabilised zirconia to reduce the thermal conductivity of the matrix. Sintering and superplastic deformation led to a solid solution and transformation to the cubic phase. The resulting superplastically foamed porous ceramics having a porosity of 45% had only 40% of the thermal conductivity of the fully densified ceramics having the same composition. This value was comparable to that of conventionally fabricated porous ceramics with the same composition and porosity. The superplastically foamed ceramics had 60%, while conventionally fabricated ceramics had only 20%, of the mechanical strength of the fully dense ceramics. (c) 2013 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.msea.2013.05.084

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  • Thermoelectric efficiency of reduced SrTiO 3 ceramics modified with la and Nb 査読

    Takashi Teranishi, Yusuke Ishikawa, Hidetaka Hayashi, Akira Kishimoto, Misaki Katayama, Yasuhiro Inada

    Journal of the American Ceramic Society   96 ( 9 )   2852 - 2856   2013年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Ceramics of LaxSr1-xNbyTi 1-yO3 (LSNT) were synthesized under various reducing atmospheres. Covering the specimens with graphite carbon felt under an Ar-gas flow during sintering drastically enhanced the electrical conductivity, σ. Ti K-edge absorption spectra indicated the presence of Ti3+ for heavily reduced specimens. The increase in conductivity was attributed to the 3d band of Ti3+. The maximum value for the figure of merit, ZT, was obtained for strontium titanate ceramics modified with both 5 mol% La and 5 mol% Nb, namely 5/5-LSNT, exhibiting a ZT value of ~0.221 at 473 K. This high ZT value was almost 1.5 × larger than that of the conventional 10 mol% La-doped sample, 10/0-LSNT (ZT~0.144), and was mainly attributed to the larger Seebeck coefficient of the material. © 2013 The American Ceramic Society.

    DOI: 10.1111/jace.12379

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  • Ferroelectric Domain Contribution to the Tunability of Ba0.8Sr0.2TiO3 Ceramics 査読

    Takashi Teranishi, Tsuyoshi Sogabe, Hidetaka Hayashi, Akira Kishimoto, Kazuhiro Fujimori

    JAPANESE JOURNAL OF APPLIED PHYSICS   52 ( 9 )   2013年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    Polarization contributions to the tunable properties of Ba0.8Sr0.2TiO3 ceramics were quantitatively studied by microwave measurements. The width of the ferroelectric domain walls (90 degrees domain walls) decreased with decreasing average grain size. The variation in domain size with grain size for grains smaller than 10 mu m was roughly proportional to the square root of the grain size, consistent with previous reports on BaTiO3. The smaller size of the 90 degrees domains (i.e., higher domain-wall density) resulted in greater tunability at an applied DC electric field of 6.7 kV/cm. The tunability of the specimen with a domain size of 161 nm was 26.5%, which was 4.4 times that of the specimen with a domain size of 259 nm (T = 6.0%). Under a relatively low DC field, the density of the domain-wall motion was the dominant factor determining the overall tunable properties, while the contributions of the ionic and electronic polarizations were relatively small in Ba0.8Sr0.2TiO3. (C) 2013 The Japan Society of Applied Physics

    DOI: 10.7567/JJAP.52.09KF06

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  • Lithium ion conductivity of Nd-doped (Li, La)TiO3 ceramics 査読

    Takashi Teranishi, Michihiro Yamamoto, Hidetaka Hayashi, Akira Kishimoto

    SOLID STATE IONICS   243   18 - 21   2013年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Lithium (Li) ion conductivities of Nd-doped (Li, La)TiO3 (LLNT) ceramics are evaluated as a function of Nd-loading. The bulk ion conductivity, sigma(dc), improves for the specimen with -0.75 mol% Nd. The conductivity of the 0.5 mol% Nd-loaded LLNT is sigma(dc) = 1.26 x 10(-3) S cm(-1) at room temperature. It is the highest conductivity measured, and is 1.33 times higher than that of the non-doped ceramic. The enhancement of the Li ion conductivity with Nd-doping in the LLNTs is attributed to an increase in the volume fraction of the A-site disordered cubic phase. (C) 2013 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.ssi.2013.04.014

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  • Effect of millimeter-wave irradiation on cation interdiffusion in the calcium titanate/strontium titanate ceramic couple 査読

    Akira Kishimoto, Yukari Kamakura, Takashi Teranishi, Hidetaka Hayashi

    MATERIALS CHEMISTRY AND PHYSICS   139 ( 2-3 )   825 - 829   2013年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    Interdiffusion between the perovskite CaTiO3 and SrTiO3 diffusion couple was investigated in an annealing method using 24-GHz MMW irradiation as the heating source. Interdiffusion was enhanced by MMW irradiation, and the apparent activation energy for interdiffusion decreased 54%, compared with conventional furnace heating. The intrinsic diffusions for both Ca2+ and Sr2+ were also enhanced, although their relative degrees of enhancement differed, partly as a result of differences in MMW absorptivity between the two ceramics. The observed isothermal diffusion enhancement could be ascribed to a nonthermal effect, apart from the differential degree of enhancement between the transport species. (C) 2013 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.matchemphys.2013.02.038

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  • Microscopic Conduction Behavior Analysis on ZrO2-based Ion Conductors by Wideband Conductivity Measurement 査読

    Takashi Teranishi, Kosuke Shimizu, Hidetaka Hayashi, Akira Kishimoto

    ELECTROCERAMICS IN JAPAN XV   566   141 - 144   2013年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:TRANS TECH PUBLICATIONS LTD  

    All contributions to the total conductivity, electrolyte electrode interfaces, grain boundaries, ion-hopping, and optical phonons, were determined on the 8 mol% yttria-stabilized zirconia (8YSZ) and 8 mol% ytterbia-stabilized zirconia (8YbSZ) ceramics using the wideband conductivity spectroscopy. Complex conductivity spectra from 10(-1) Hz to 10(14) Hz were successfully obtained. The higher total conductivity of the 8YbSZ ceramics compared to the 8YSZ in wideband frequencies as mainly attributed to difference in the DC conductivity due to universal dielectric response (UDR), sigma(dc); sigma(dc) ((8YbSZ)) &gt; sigma(dc) ((8YSZ)). Other parameters in the UDR and the optical phonon parameters did not greatly influence on the difference in their intrinsic conductivities.

    DOI: 10.4028/www.scientific.net/KEM.566.141

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  • Superplastically foaming method for inclusion of closed pores in fully densified ceramics 査読

    Akira KISHIMOTO

    Journal of the Ceramic Society of Japan   121 ( 1415 )   527 - 533   2013年

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Ceramic Society of Japan  

    DOI: 10.2109/jcersj2.121.527

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  • SUPERPLASTICALLY FOAMING METHOD FOR RELIABLE POROUS CERAMICS 査読

    Akira Kishimoto, Takahiro Nakagawa, Takashi Teranishi, Hidetaka Hayashi

    SUPERPLASTICITY IN ADVANCED MATERIALS   735   109 - 112   2013年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:TRANS TECH PUBLICATIONS LTD  

    Porous ceramics incorporate pores to improve several properties including thermal insulation, maintaining inherent ceramic properties such as corrosion resistance and large mechanical strength. Conventional porous ceramics are usually fabricated through an insufficient sintering, leading to degraded strength and durability. Contrary to this, we have innovated superplastically foaming method to make ceramic foam only in the solid state. In this method, the previously inserted foam agent evaporates after the full densification of matrix at around the sintering temperature. Closed pores expand utilizing the superplastic deformation driven by the evolved gas pressure. Based on this concept we fabricated 8mol% yttria stabilized zirconia based porous ceramics and examined the properties concerning the high temperature structural material with thermal insulation.

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  • Quasi-millimeter-wave absorption behavior in Y/Yb-stabilized zirconia ceramics 査読

    Takashi Teranishi, Naoki Akiyama, Keiko Ayano, Hidetaka Hayashi, Akira Kishimoto, Kazuhiro Fujimori, Takuya Hoshina, Hiroaki Takeda, Takaaki Tsurumi

    APPLIED PHYSICS LETTERS   100 ( 24 )   2012年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER INST PHYSICS  

    Broadband dielectric spectra from 10 to 10(14) Hz were acquired for 8 mol. % Y2O3/Yb2O3-stabilized zirconia (8YSZ and 8YbSZ) ceramics that related the dipole and ionic polarization losses to the absorption efficiency of electromagnetic irradiation. For 24 GHz irradiation, 8YSZ exhibited a higher absorption efficiency than 8YbSZ, resulting in a higher dielectric loss. The difference in the dielectric loss was interpreted as the difference in the loss of the dipoles originating from the fluctuations in the defect associations (Y'(Zr)Vo and Yb'(Zr)Vo). (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4729147]

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  • Synthesis of organic/inorganic hybrid composite membranes and their structural and conductivity properties 査読

    Uma Thanganathan, Suresh Kumar, Akira Kishimoto, Kunio Kimura

    Materials Letters   72   81 - 87   2012年4月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier BV  

    DOI: 10.1016/j.matlet.2011.12.066

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  • Thermoelectric Property of Polycrystalline Aluminum-Doped Zinc Oxide Enhanced by Micropore Foaming 査読

    Takashi Teranishi, Yosuke Mori, Hidetaka Hayashi, Akira Kishimoto

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   95 ( 2 )   690 - 695   2012年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-BLACKWELL  

    A unique micropore foaming technique was used to enhance the thermoelectric properties of polycrystalline aluminum-doped zinc oxide (AZO). Silicon carbide (alpha-SiC) and aluminum nitride (AlN) were used as foaming precursors. Thermoelectric conductivity, kappa, decreased on addition of both precursors, increasing the porosity. Electric conductivity, sigma, decreased upon addition of alpha-SiC, and subsequent addition of AlN reversed the effect. This phenomenon is due to the chemical reactions that occur upon addition of each precursor: the active oxidation of alpha-SiC and the decomposition reaction of AlN. The Seebeck coefficient, S, for 0.5 mol% AlN-doped AZO (Al0.005Zn0.995O, AZO-0.005) was more than twice that of conventional non-doped AZO. Accordingly, the power factor and the figure of merit, ZT, for the porous AlN-doped AZO-0.005 were 4.9 and 5.8 times those of the conventional polycrystalline AZO, respectively, demonstrating that the compositionally optimized porous AZO exhibited excellent thermoelectric properties at high temperatures.

    DOI: 10.1111/j.1551-2916.2011.04837.x

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  • Fabrication of a helical tubular pore in YSZ ceramics by the superplastically foaming method 査読

    Masanori Okada, Takashi Teranishi, Hidetaka Hayashi, Akira Kishimoto

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   59 ( 2 )   90 - 94   2012年2月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    We have already proposed and demonstrated novel ceramic foams named "superplastically foamed ceramics" utilizing the superplastic deformation. Since almost all the processes are carried out in solid phase, figure and the location of the foaming agent can be controllable, leading to desired patterning of closed pore in a fully densified ceramics. We have already demonstrated two-dimensional (2D) pore patterning through the superplastically foaming method. In the present study, we aim to fabricate helical tubular pore in zirconia based ceramics as a typical 3D patterned pore. As a foaming agent, SiC powders were used with a form of thin sheet based on methylcellulose aqueous solution followed by drying. A core cylindrical matrix compact was first fabricated using Φ 10 steel die and the liner foaming agent was attached to make helical pattern. The patterned core matrix was placed in Φ 14 or Φ 15 steel die and pressed together with the filled matrix powder. The resultant powder compact was heat treated at 1600°C for 8h for sintering followed by foaming to give a ceramics with 3D tubular pore. Continuous upheaval reflecting the tubular pore was clearly observed on the side wall of the cylinder and helical tubular pore with different pitch can be fabricated.

    DOI: 10.2497/jjspm.59.90

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  • Broadband spectroscopy of the complex conductivity of polycrystalline yttria-stabilized zirconia 査読

    Takashi Teranishi, Hidetaka Hayashi, Akira Kishimoto, Takaaki Tsurumi

    MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS   177 ( 1 )   69 - 73   2012年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Broadband conductivity spectra from 100 to 10(14) Hz (100 THz) were acquired for yttria-stabilized zirconia (10 mol% Y(2)O(3)-doped ZrO(2), 10YSZ) to quantify contributions from conduction due to the electrolyte electrode interface, grain boundaries, universal dielectric response (UDR), and optical phonons. The UDR contribution governed the intrinsic conductivity at all frequencies except specific frequencies in the terahertz range, where phonon contributions governed conductivity for both ceramics and single crystals. UDR parameters sigma(0) and sigma(dc), increased with increasing temperature, resulting in increased microwave conductivity. The complex conductivity converged at frequencies of hundreds of gigahertz due to a decrease in the power-law constants, with increasing temperature. The optical phonon contribution to the total conductivity, due to an increase in the damping factor gamma(1TO) with increasing temperature, was small, while the phonon-mode frequency omega(1TO) affected the microwave conductivity of 10YSZ. (C) 2011 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.mseb.2011.09.039

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  • Effect of reducing atmosphere on AIN ceramics sintered by millimerter Wave-HIP combined sintering 査読

    Kyohei Yamashita, Yoshihisa Kogo, Takashi Teranishi, Hidetaka Hayashi, Akira Kishimoto

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   59 ( 1 )   17 - 21   2012年1月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    The effect of reducing atmosphere on yttria dispersed AIN ceramics sintered by millimeter wave-HIP combined sintering was investigated. The specimens were sintered by millimeter wave (MMW) heating under nitrogen reducing atmosphere containing 3 vol% hydrogen followed by post-HIP treatment at 1700°C for 0.5 h under nitrogen pressure of 190 MPa. The relative densities to the theoretical one saturated at the first MMW heating over 1700°C. Thermal conductivities of AIN ceramics sintered by MMW heating under heavily reduced atmosphere with nitrogen were higher than that through MMW heating under normally reduced atmosphere. The thermal conductivity increased with decreasing the yttria additive amount and with increasing the sintering temperature. The optimized yttria dispersion amount was 1 wt% in the MMW heating at 1800°C for 0.5 h. Relative density and thermal conductivity increased by post-HIP treatment. The optimized yttria dispersion amount shifted from 1 wt% to 3 wt% after post-HIP treatment.

    DOI: 10.2497/jjspm.59.17

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  • Complex Conductivity Using Wideband Spectroscopy for Yttria/Ytterbia-Stabilized Zirconia Ceramics 査読

    Takashi Teranishi, Kosuke Shimizu, Naoki Akiyama, Hidetaka Hayashi, Akira Kishimoto, Kazuhiro Fujimori

    JAPANESE JOURNAL OF APPLIED PHYSICS   51 ( 1 )   2012年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN SOC APPLIED PHYSICS  

    Complex conductivity wideband spectra from 10(-1) to 10(14) Hz (100 THz) were determined for 8 mol% yttria-stabilized zirconia (8YSZ) and 8 mol% ytterbia-stabilized zirconia (8YbSZ) ceramics. The contributions of electrolyte-electrode interfaces, grain boundaries, intragrain ion-hopping, and optical phonons were quantified to relate the microscopic conduction behavior to the overall conductivity. Intrinsic conductivity was mostly governed by ion-hopping. For both 8YSZ and 8YbSZ, ion-hopping followed the universal dielectric response (UDR) for broadband frequencies except for the phonon dispersion frequencies. The higher overall conductivities of the 8YbSZ ceramics compared to the 8YSZ ones were attributed to differences in the UDR contributions. The dominant factor determining the difference in the intrinsic conductivity in broadband frequencies from direct current (DC) to microwave between the 8YSZ and 8YbSZ ceramics was the DC conductivity due to UDR, sigma(dc), where sigma(dc(8YbSZ)) &gt; sigma(dc(8YSZ)). Other parameters in the UDR and the optical parameters did not greatly influence the intrinsic conductivities. (C) 2012 The Japan Society of Applied Physics

    DOI: 10.1143/JJAP.51.011102

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  • Effect of Metal Ions in Electrolyte on Organic Composite Electrodeposition 査読

    Kazuya ISHII, Takashi DOI, Masanari KIMOTO, Hidetaka HAYASHI, Akira KISHIMOTO

    63 ( 10 )   651 - 653   2012年

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.4139/sfj.63.651

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  • Effect of varying the ratio of matrix/dispersoid particle size on the piezoresistivity of alumina/carbon-black composite ceramics 査読

    Akira Kishimoto, Yuto Takagawa, Takashi Teranishi, Hidetaka Hayashi

    MATERIALS LETTERS   65 ( 14 )   2197 - 2200   2011年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Alumina/carbon-black composite ceramics with different percolation thresholds were fabricated by changing the size ratio of constituent particles. The dependence of resistivity on pressure was established for each sample. The compositional dependence of resistivity can be explained by percolation theory. The percolation threshold decreases with increasing alumina/carbon-black particle size ratio. The pressure dependence of the resistivity increases as the composition approaches the percolation threshold. When the relative composition at the percolation threshold is fixed, the sensitivity increases with increasing matrix/dispersoid initial particle size ratio. (C) 2011 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.matlet.2011.04.042

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  • Enhancement of ionic conductivity in stabilized zirconia ceramics under millimeter-wave irradiation heating 査読

    Akira Kishimoto, Keiko Ayano, Hidetaka Hayashi

    SCRIPTA MATERIALIA   64 ( 9 )   860 - 863   2011年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    Ionic conductivity in yttria-stabilized zirconia ceramics under millimeter-wave irradiation heating was compared with that obtained using conventional heating. The former was found to result in higher conductivity than the latter. Enhancement of the ionic conductivity and the reduction in activation energy seemed to depend on self-heating resulting from the millimeter-wave irradiation. Millimeter-wave irradiation heating restricted the degradation in conductivity accompanying over-substitution, suggesting the optimum structure that provided the maximum conductivity could be different between the two heating methods. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.scriptamat.2011.01.017

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  • Millimeter wave-HIP combined sintering of AIN ceramics and their thermal conductivity 査読

    Syunsuke Ohura, Hidetaka Hayashi, Akira Kishimoto

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   58 ( 1 )   57 - 62   2011年1月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    With the aim to improve the thermal conductivity of yttria dispersed AIN ceramics through a short time and low temperature treatment under nitrogen atmosphere, millimeter wave (MMW) heating was combined with post-HIP treatment. Relative density increased by post HIP treatment over 1600°C on previously MMW heated samples even with the same temperature. The thermal conductivity exceeded over 170W/m°K when treated through MMW-HIP combined sintering with 1700°C+ 1700°C treatment by 0.5 h+0.5 h. This valued had been attained through the MMW treatment alone at 1800 °C for 2 h under 3 wt% hydrogen mixed nitrogen atmosphere. The optimal dispersion amount was 3 wt% in the MMW-HIP combined sintering while that was 5 wt% in the MMW sintering alone. The relative density has been saturated at the first MMW heating over 1700°C. On the other hand, thermal conductivity increased with the treatment temperature both in first MMW and post HIP. No significant pressure dependence can be seen in the thermal conductivity with this experimental condition.

    DOI: 10.2497/jjspm.58.57

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  • Formation of 3D tubular cannel in fully densified zirconia ceramics by free-foaming method using superplasticity 査読

    T. I. Bhuiyan, H. Hayashi, A. Kishimoto

    CERAMICS INTERNATIONAL   37 ( 1 )   399 - 402   2011年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCI LTD  

    Three-dimensional (3D) tubular cannels in fully densified zirconia ceramics have been fabricated by a newly developed solid-state free-foaming method using superplasticity. Three mole percent of yttria-stabilised zirconia (3YSZ) and alpha-SiC were used as foam matrix and foaming agent simultaneously. Dried pattern of 15 wt% (wt%) alpha-SiC slurry based on 10 wt% methyl cellulose buried into 3YSZ powder compacts and proper heat treatment at the sintering temperature causes successful fabrication of 3D cannel in zirconia ceramics. (C) 2010 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

    DOI: 10.1016/j.ceramint.2010.08.016

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  • Superplastically foaming method to make closed pores inclusive porous ceramics 査読

    Akira Kishimoto, Hidetaka Hayashi

    IOP Conference Series: Materials Science and Engineering   18 ( 12 )   2011年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    Porous ceramics incorporates pores to improve several properties including thermal insulation maintaining inherenet ceramic properties such as corrosion resistance and large mechanical strength. Conventional porous ceramics is usually fabricated through an insufficient sintering. Since the sintering accompanies the exclusion of pores, it must be terminated at the early stage to maintain the high porosity, leading to degraded strength and durability. Contrary to this, we have innovated superplastically foaming method to make ceramic foams only in the solid state. In this method, the previously inserted foam agent evaporates after the full densification of matrix at around the sintering temperature. Closed pores expand utilizing the superplastic deformation driven by the evolved gas pressure. The typical features of this superplastically foaming method are listed as follows, 1. The pores are introduced after sintering the solid polycrystal. 2. Only closed pores are introduced, improving the insulation of gas and sound in addition to heat. 3. The pore walls are fully densified expecting a large mechanical strength. 4. Compared with the melt foaming method, this method is practical because the fabrication temperature is far below the melting point and it does not need molds. 5. The size and the location pores can be controlled by the amount and position of the foam agent. © 2011 Ceramic Society of Japan.

    DOI: 10.1088/1757-899X/18/18/182002

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  • Tribological properties and oxidation resistance of (Cr,Al,Y)N and (Cr,Al,Si)N films synthesized by radio-frequency magnetron sputtering method 査読

    T. Miyake, A. Kishimoto, H. Hasegawa

    Surface and Coatings Technology   205   S290 - S294   2010年12月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier BV  

    DOI: 10.1016/j.surfcoat.2010.08.017

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  • Alumina based low permittivity substrate utilizing superplastically foaming method 査読

    Miyo Wakiyama, Hidetaka Hayashi, Akira Kishimoto

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   118 ( 1383 )   1090 - 1093   2010年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

    Alumina based closed pore dominated substrates have been fabricated by using superplastically foaming method developed by our group. Co-dispersing of magnesium aluminate spinel (Spinel) and zirconia without dopant (0YZ) provided adequate superplastisity to alumina matrix, while individual dispersion of spinel or zirconia resulted in only small deformation. The dielectric constant of superplastically foamed alumina decreased monotonically with porosity. Introduced pores were all closed nature at least up to 30% of porosity, at that porosity the permittivity became half as that of full dense one. Effect of the sweating water or ambient humidity has been proved to be identical to those of full dense one, which is favorable for semiconductor substrate. (C)2010 The Ceramic Society of Japan. All rights reserved.

    DOI: 10.2109/jcersj2.118.1090

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  • The control of mechanical strength by an electric field in ceramic composites dispersed with piezoelectric particles 査読

    Akira Kishimoto

    Journal of Electroceramics   24 ( 2 )   115 - 121   2010年4月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Springer Science and Business Media LLC  

    DOI: 10.1007/s10832-009-9568-9

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  • PATTERNING OF CLOSED PORES UTILIZING THE SUPERPLASTICALLY FOAMING METHOD 査読

    A. Kishimoto, Y. Nishino, H. Hayashi

    INNOVATIVE PROCESSING AND MANUFACTURING OF ADVANCED CERAMICS AND COMPOSITES   212   143 - 151   2010年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER CERAMIC SOC  

    We have already innovated superplastically foaming method in which pore expands after densification of the matrix utilizing the superplastic deformation. Based on this superplastically foaming method using 3YSZ (3 mol% yttria stabilized zirconia) and alpha SiC as matrix and foam agent, respectively, we have successfully fabricated several dots closed pore pattern and C shaped as well as S shaped closed tube patterns by optimizing the amount of matrix 3YSZ. In addition to the shape of the closed pore, the protuberance based on the expansion of the pore changed with the location of the foam agent in the matrix. The shape of the closed pores and the interaction between them can be controlled by the concentration of the foam agent and the amount of the matrix.

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  • Millimeter wave sintering of AlN ceramics for heat sink application 査読

    Akira Kishimoto, Tetsuya Morimoto, Hidetaka Hayashi

    ASIAN CERAMIC SCIENCE FOR ELECTRONICS III AND ELECTROCERAMICS IN JAPAN XII   421-422   533 - 536   2010年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:TRANS TECH PUBLICATIONS LTD  

    By using 24 GHz millimeter-wave irradiation, full densification of AlN added with Y(2)O(3) was attained at 1700 degrees C, which is comparable to 28GHz-wave irradiation. Thermal conductivity of a resultant sample exceeded 200 W/mK, which is the highest value in AlN fabricated in non-reducing atmosphere.

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  • Mechanical Properties of Metallic Perovskite Mn3Cu0.5Ge0.5N:High-Stiffness Isotropic Negative Thermal Expansion Material 査読

    Yoshinobu Nakamura, Koshi Takenaka, Akira Kishimoto, Hidenori Takagi

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   92 ( 12 )   2999 - 3003   2009年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-BLACKWELL  

    The basic mechanical properties of antiperovskite manganese nitride, Mn3Cu1-xGexN, known as an isotropic negative thermal expansion (NTE), have been evaluated. The mother material, Mn3CuN, was a soft and ductile intermetallic compound with a positive linear thermal expansion coefficient (alpha=+20 x 10-6 K-1) at room temperature. The thermal expansion properties of Mn3CuN were dramatically changed by Ge doping, resulting in an extremely large NTE material (alpha=-12.5 x 10-6 K-1) by 50% substitution of Cu with Ge. Associate with this, the mechanical properties were found to be strongly modified by Ge doping, and both the stiffness and the hardness of Mn3Cu1-xGexN increased with increasing the Ge content, x. The NTE material, Mn3Cu0.5Ge0.5N, had an enhanced hardness of 570-620 H-v and an exceptionally large Young's modulus of 211-320 GPa. The giant, isotropic NTE compatible with the enhanced value of Young's modulus enables us to fabricate extremely stiff, stable, and lightweight zero thermal expansion composites for the use in many fields of industries.

    DOI: 10.1111/j.1551-2916.2009.03297.x

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  • Applicability of nitride powders as foaming agents in superplastically foamed ceramics 査読

    Hiroshi Yamaoka, Hidetaka Hayashi, Akira Kishimoto

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   117 ( 1371 )   1233 - 1235   2009年11月

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    担当区分:最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

    The applicability of several nitride powders for use as foaming agents in superplastically foaming ceramics was investigated. Ceramic mono-foams were fabricated successfully using AlN and Si3N4 foaming agents. By using BN as a foam agent, on the other hand, we cannot fabricated well developed ceramic foams due to cracking and fracture. When the quantity of foaming agent was increased, the porosity increased to a certain amount, then saturated. With equal amounts of Si3N4, the porosity from the dispersed foaming agent was higher than that obtained from a monolithic compact without mixing, which was similar to the case of SiC foam agent. (C) 2009 The Ceramic society of Japan. All rights reserved.

    DOI: 10.2109/jcersj2.117.1233

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  • Fabrication of closed-pore inclusive low-permittivity substrates insensitive to ambient humidity 査読

    Miyo Wakiyama, Kiminori Waku, Hidetaka Hayashi, Akira Kishimoto

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   117 ( 1369 )   1013 - 1016   2009年9月

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    担当区分:最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

    With the aim to reduce the permittivity of a dielectric substrate, closed pores have been introduced into alumina based ceramics by our innovated superplastisically foaming method. Affect of the ambient humidity on the dielectric constant was compared to those for conventional porous ceramics as well as full densified one. In the dry atmosphere, the dielectric constant (k) decreased with the porosity similar to the conventional porous ceramics. Affect of the ambient humidity on the dielectric property was almost identical to that of fully densified one. The degradation of mechanical strength depended on the pore size introduced. (C)2009 The Ceramic Society of Japan. All rights reserved.

    DOI: 10.2109/jcersj2.117.1013

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  • Morphology Change of Silver Deposit from BMITFSI Ionic Liquid 査読

    Tomomi Murakami, Yoshihisa Kogo, Kiminori Waku, Hidetaka Hayashi, Akira Kishimoto

    ELECTROCHEMISTRY   77 ( 8 )   645 - 646   2009年8月

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    担当区分:最終著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELECTROCHEMICAL SOC JAPAN  

    The electrodeposition of silver was investigated with 1-butyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl] amide containing Ag-TFSI at 150 degrees C. The influence of current density oil the morphology of the silver deposit was Studied by cyclic voltammetry and scanning electron microscopy. The size of the silver crystallite became smaller and dendrite-like growth was suppressed with increasing current density.

    DOI: 10.5796/electrochemistry.77.645

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  • Piezoresistivity of magnesia-graphite composite ceramics 査読

    Kiminori Waku, Shuuhei Tagya, Hidetaka Hayashi, Akira Kishimoto

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   117 ( 1367 )   793 - 796   2009年7月

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    担当区分:最終著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

    Magnesia-graphite composite ceramics were fabricated by hot pressing in Ar atmosphere, and their electrical properties were measured. The electrical resistivity increases as the graphite volume fraction x decreases, following well-accepted power law model based on the percolation theory. Renormalized pressure coefficient of resistance, d(In R)/dP, decreases as x decreases. This behavior can be explained by the strong enhancement of d(In p)/dx toward the percolation threshold. By fitting the x dependence or d(In rho)/dP with a theoretical equation, the Young's modulus of the composites was estimated. (C) 2009 The Ceramic Society of Japan. All rights reserved.

    DOI: 10.2109/jcersj2.117.793

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  • Influence of processing parameters on the closed pore patterns utilizing the superplastisically foaming method 査読

    西野祐輔, 林秀考, 岸本昭

    粉体および粉末冶金   56 ( 6 )   389 - 394   2009年6月

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    担当区分:最終著者, 責任著者   記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.2497/jjspm.56.389

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  • Mechanical and electrical properties of superplastically foamed titania-based ceramics 査読

    Akira Kishimoto, Mako Obata, Kiminori Waku, Hidetaka Hayashi

    CERAMICS INTERNATIONAL   35 ( 4 )   1441 - 1445   2009年5月

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    担当区分:筆頭著者, 最終著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCI LTD  

    Ceramic monofoams based on titania were fabricated using superplastic deformation driven by the evolution of gas from a foam agent. Titania based polyfoam with porosities of up to 25% can be fabricated by dispersing only 1 mol% of foam agent (silicon carbide). When the mechanical strength of superplastically foamed titania was compared with that of fully densified titania and conventionally fabricated porous titania, the superplastically foamed ceramics retained 70% of the mechanical strength of the dense ceramics, while that of the conventional porous ceramic decreased to 40%. Niobium-doped semiconducting titania polyfoam was also fabricated. The electrical resistivity and affect of ambient humidity were similar to those of the dense ceramics. (C) 2008 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

    DOI: 10.1016/j.ceramint.2008.07.010

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  • Alumina-based monofoams utilizing superplastic deformation facilitated by the addition of magnesia or magnesium aluminate spinel 査読

    Mako Obata, Hidetaka Hayashi, Akira Kishimoto

    JOURNAL OF ALLOYS AND COMPOUNDS   471 ( 1-2 )   L32 - L35   2009年3月

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    担当区分:最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    Alumina-based ceramic foam utilizing the superplastic deformation after sintering has been proposed and demonstrated by the present authors. Effects of two kinds of additives, magnesia or magnesium aluminate spinel on the. figure of alumina-based ceramic foams were examined. In both cases, total porosity increased with increasing the addition amount up to 30 mol%. With the same addition amount, the porosity of spinel-added foam was slightly larger than that of magnesia-added one. On pore expansion, relative density of pore shell decreased while the density degradation degree of magnesia-added foam was more serious than that of spinel-added one. (C) 2008 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jallcom.2008.03.136

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  • Improvement in the Specific Strength by Arranging Closed Pores in Fully Densified Zirconia Ceramics 査読

    Akira Kishimoto, Masaaki Hanao, Hidetaka Hayashi

    ADVANCED ENGINEERING MATERIALS   11 ( 1-2 )   96 - 100   2009年1月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-V C H VERLAG GMBH  

    DOI: 10.1002/adem.200800259

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  • Resistivity of Alumina-Graphite Composite Ceramics 査読

    Kiminori Waku, Hidetaka Hayashi, Akira Kishimoto

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   91 ( 12 )   4168 - 4170   2008年12月

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    担当区分:最終著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-BLACKWELL PUBLISHING, INC  

    Alumina-graphite composite ceramics were fabricated by normal sintering in a reducing atmosphere, and their bulk resistivity measured. Because the composites consisted of connected clusters of conducting graphite particles within an insulating alumina matrix, the experimental results were discussed in terms of percolation theory. The electrical resistivity increases as the volume fraction of graphite (x) decreases, following a well-accepted power law model. The observed critical exponent was larger than the expected universal value based on a three-dimensional structure, due to a weighted distribution of conductivity throughout the sample. The renormalized pressure coefficient of resistance, d(ln R)/dP, decreased as x decreased and was explained by a strong enhancement of d(ln rho)/dx as the percolation threshold was approached.

    DOI: 10.1111/j.1551-2916.2008.02820.x

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  • The mechanical and thermal properties of porous zirconia ceramics fabricated through a solid-state foaming method 査読

    Masaaki Hanao, Hidetaka Hayashi, Akira Kishimoto

    Journal of the Japan Society of Powder and Powder Metallurgy   55 ( 10 )   732 - 737   2008年10月

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    担当区分:最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We have already fabricated ceramic mono-foams by expanding once-sintered dense shells utilizing the superplastic deformation of 3YSZ, 8YSZ, alumina and titania based ceramics. In the present study, granular coating method was applied to make a porous ceramics through the superplastically foaming method based on 3YSZ. Both mechanical strength and thermal conductivity were measured and compared with those of fully densified as well as conventional porous 3YSZ ceramics. Porous ceramics with porosity over 35% can be fabricated with less than 15 vol% of foam agent. The mechanical strength and thermal conductivity were superior or comparable to those for conventionally fabricated porous ceramics with the same porosity level.

    DOI: 10.2497/jjspm.55.732

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  • Improvement of piezoresistance properties of silicon carbide ceramics through co-doping of aluminum nitride and nitrogen 査読

    Akira Kishimoto, Yasuyuki Okada, Hidetaka Hayashi

    CERAMICS INTERNATIONAL   34 ( 4 )   845 - 848   2008年5月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCI LTD  

    The piezoresistance coefficient was measured on co-doped silicon carbide ceramics. Evaluation samples of alpha-silicon carbide ceramics were first fabricated by glass capsule HIP method using powder mixture of silicon carbide and aluminum nitride with various ratios. The resultant aluminum nitride added silicon carbide ceramics were doped with nitrogen by changing the post-HIP nitrogen gas pressure. The lattice parameter increased with the amount of adding aluminum nitride indicating that the incorporated aluminum substituted smaller silicon atoms. After post-HIP treatment, lattice parameter then decreased with nitrogen gas pressure. The piezoresistive coefficient increased with the addition of aluminum nitride, it further increased with the nitrogen doping pressure. (C) 2007 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

    DOI: 10.1016/j.ceramint.2007.09.033

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  • Anomalous grain growth during hot isostatic pressing of magnesia ceramics made from starting powders with different coarse/fine mixing ratios 査読

    Akira Kishimoto, Masaaki Hanao, Hidetaka Hayashi

    SCRIPTA MATERIALIA   57 ( 4 )   321 - 324   2007年8月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    The influence of coarse powder on grain growth during hot isostatic pressing (HIP) was examined. Powder mixtures containing 0%, 0.5%, 5% and 20% coarse powder were prepared. The magnesia sintered without pressure was subjected to HIP at 1600 degrees C for 0.5 h at different pressures. The samples produced from fine powder had the largest grains after HIP treatment, although they had the smallest grains before it. The optical transparency of the HIP-treated magnesia ceramics increased with grain size. (c) 2007 Acta Materialia Inc. Published. by Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.scriptamat.2007.04.032

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  • Effect of additives on the pore evolution of zirconia based ceramic foams after sintering 査読

    Tsuyoshi Higashiwada, Hiroshi Asaoka, Hidetaka Hayashi, Akira Kishimoto

    JOURNAL OF THE EUROPEAN CERAMIC SOCIETY   27 ( 5 )   2217 - 2222   2007年

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    担当区分:最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCI LTD  

    A new superplasticity foaming method was used to form zirconia-based ceramic foams. Silica and alumina were chosen as additives because they facilitate the 2D superplastic deformation. The effects of these additives on macroscopic pore evolution were examined after heat treatment for up to 40 h. The addition of silica or alumina also enhanced the 3D deformation during superplasticity foaming. The total porosity of mono-foams made from 3 mol% yttria-stabilised zirconia without additives increased with heat treatment for up to 24 h, and then levelled off. The porosity of silica-dispersed foam was greater than that without additives and continued to increase for up to 40 h. Conversely, the porosity of alumina-dispersed ceramic foam reached saturation within 8 h. Consequently, the porosity of alumina-dispersed foam was greater than that without additives after heating for 8 h, while the latter exceeded the former with prolonged heating for more than 16 h. The detailed effects of alumina dispersion on the foam development behaviour were examined in connection with the microstructure. (c) 2006 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jeurceramsoc.2006-08-008

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  • Fabrication of alumina-based ceramic foams utilizing superplasticity 査読

    Akira Kishimoto, Mako Obata, Hiroshi Asaoka, Hidetaka Hayashi

    JOURNAL OF THE EUROPEAN CERAMIC SOCIETY   27 ( 1 )   41 - 45   2007年

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCI LTD  

    Model ceramic foams were fabricated by expanding once-sintered dense shells utilizing the superplastic deformation of alumina dispersed with 3 mol% yttria-stabilized zirconia (3YSZ) or magnesia. The grain growth of aluinina was suppressed by adding 3YSZ and the resultant grain size and amount of dispersion were closely related to the total porosity. Total porosity of the ceramic foam depended on the grain size and their distributions irrespective of the size of starting powders. (c) 2006 Elsevier Ltd. All ri-hts reserved.

    DOI: 10.1016/j.jeurceramsoc.2006.03.002

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  • Solid state foaming and free-forming of closed pore utilizing the superplasticity of zirconia ceramics 査読

    A. Kishimoto, T. Higashiwada, M. Takahara, H. Hayashi

    ECO-MATERIALS PROCESSING AND DESIGN VIII   544-545   641 - +   2007年

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:TRANS TECH PUBLICATIONS LTD  

    The purpose of this study is to make a superplasticity ceramic foam with several isolated closed pores. Three mol percent of yttria stabilized zirconia (3 YSZ) was used as foam matrix and -SiC as foam agent. Two kinds of powder slurries based on methyl cellulose aqueous solution were first prepared. Using the 3YSZ slurry, green sheet was fabricated using a glass bar. After dried, patterning of SiC slurry was conducted on the 3YSZ sheet through a copper mask. Three patterned sheets were cut and buried in a 3YSZ powder compacts. Through the heat treatment at the sintering temperature, a ceramic foam containing several isolated closed pores derived from the SiC pattern was successfully fabricated.

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  • High temperature piezoresistance properties of 6H-SiC ceramics doped with trivalent elements

    Akira Kishimoto, Daisuke Mutaguchi, Hidetaka Hayashi, Yoshimitsu Numata

    MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY   135 ( 2 )   145 - 149   2006年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    Piezoresistance coefficient was measured at room and elevated temperatures on 6H-SiC ceramics doped with different amounts of boron, aluminum or gallium. The piezoresistance coefficient increased with increasing the addition within their solid solution limits. The profile of carrier concentrations, lattice constant and piezoresistance coefficient against doping levels were closely related. In few samples piezoresistance coefficient slightly decreased with measurement temperature. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.mseb.2006.08.050

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  • Influence of the kinds of aluminum source on the preferential orientation and properties of Na beta-alumina ceramics

    Hiroshi Asaoka, Rie Ogawa, Hidetaka Hayashi, Akira Kishimoto

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   114 ( 1332 )   719 - 721   2006年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

    Na beta-alumina is a two-dimensional ionic conductor in which insulating spinel layers separate conducting planes of Na+ ions. Na beta-alumina ceramics is expected to be used as solid electrolytes because it is strong ionic conductor and mechanically reliable. Therefore, we prepared c-plane-oriented Na beta-alumina ceramics from three aluminum sources using a hot-pressing method and evaluated their ionic conductivity and mechanical strength. In all samples, the ionic conductivity perpendicular to the pressing direction was ten times greater than in the parallel direction. The mechanical strength parallel to the pressing direction was 1.5 times larger than that in the perpendicular direction. The samples made from a mixture of 50 mol% platelike gibbsite and 50 mol% spherical alumina showed the maximum preferential orientation with favorable relative density.

    DOI: 10.2109/jcersj.114.719

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  • The exploitation of superplasticity in the successful foaming of ceramics after sintering

    Akira Kishimoto, Tsuyoshi Higashiwada, Hiroshi Asaoka, Hidetaka Hayashi

    ADVANCED ENGINEERING MATERIALS   8 ( 8 )   708 - 711   2006年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-V C H VERLAG GMBH  

    DOI: 10.1002/adem.200600070

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  • Using ion exchange to control the mechanical strength of Naβ-alumina ceramics

    A. Kishimoto, M. Morita, H. Asaoka, H. Hayashi

    Solid State Ionics   177 ( 9-10 )   949 - 953   2006年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.ssi.2005.12.033

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  • High-voltage screening on thermally shocked titania ceramics

    A Kishimoto, C Ogata, M Obata, H Hayashi

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   89 ( 1 )   361 - 363   2006年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:BLACKWELL PUBLISHING  

    We evaluated the effect of high-voltage screening on thermally shocked titania ceramics. When the strength distribution was broadened by a thermal shock close to the critical temperature difference, high-voltage screening removed the relatively weak samples, and. when thermally shocked samples were mixed into pristine samples, all the thermally shocked samples were eliminated when adequate screening field was applied.

    DOI: 10.1111/j.1551-2916.2005.00682.x

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  • Preferential orientation dependent mechanical and electrical properties in Naβ-alumina ceramics

    A. Kishimoto, K. Shimokawa

    Key. Eng. Mat.   301   147 - 150   2006年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: 10.4028/0-87849-982-2.147

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  • Influence of the kinds of aluminum source on the preferential orientation and properties of Naß-alumina ceramics

    H. Asaoka, R. Ogawa, H. Hayashi, A. Kishimoto

    J. Ceram. Soc. Jpn.   114 ( 8 )   701 - 703   2006年

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  • 回転リングディスク電極を用いた界面pH測定とそのNi-Al(OH)3複合めっきへの適用

    林秀考, 見津正一, 岸本昭

    表面技術   2006年

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  • Thermal and optical properties of transparent magnesium oxide ceramics fabricated by post hot-isostatic pressing

    K Itatani, T Tsujimoto, A Kishimoto

    JOURNAL OF THE EUROPEAN CERAMIC SOCIETY   26 ( 4-5 )   639 - 645   2006年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCI LTD  

    The transparent magnesium-oxide (MgO) ceramic could be fabricated by a hot-isostatic press (HIP) technique of pressure less-sintered MgO compact, using non-agglomerated MgO powder with the average primary particle size of 57 nm. The relative density and average grain size of MgO compact pressureless-sintered at 1600 degrees C for 5 h were 96.7% and 10.7 mu m, respectively. owing to the HIPing operation (0.5 h) of pressureless-sintered compact at a temperature between 1500 and 1600 degrees C. relative densities of the MgO ceramics attained 99.9% or more with light transmission. The average grain size increased from 132 to 199 mu m with HIPing temperature from 1500 to 1600 degrees C. The in-line transmission of the MgO specimen HIPed at 1600 degrees C for 0.5 h increased from 52 to 55% with increasing wavelength from 500 to 900 nm and corresponded to approximately 65%, compared to that of the MgO single crystal. The thermal conductivity of this MgO specimen attained with increasing test temperature up to 873 K. 53.5 W m(-1) K-1, whereas the thermal diffusivity decreased gradually to reach 0.0416 cm(2) s(-1) 0 2005 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jeurceramsoc.2005.06.011

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  • Ⅲ族元素および窒素を共添加した炭化珪素セラミックスのピエゾ抵抗効果

    岸本昭, 岡田泰行, 牟田口大輔, 林秀考

    粉体および粉末冶金   52 ( 10 )   753 - 756   2005年10月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.2497/jjspm.52.753

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  • 構造を制御した金属/グラファイト粒子複合皮膜の電析

    林秀考, 武田大輔, 岸本昭

    粉体および粉末冶金   52 ( 8 )   619 - 623   2005年8月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.2497/jjspm.52.619

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  • Strain-Dependent Electrical Conduction in the System NiO-CaO

    Yoshinobu Nakamura, Hiroshi Ogawa, Tetsuya Nakashima, Akira Kishimoto, Hiroaki Yanagida

    Journal of the American Ceramic Society   80 ( 6 )   1609 - 1611   2005年1月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Wiley  

    DOI: 10.1111/j.1151-2916.1997.tb03026.x

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  • Nonlinear Current-Voltage Characteristics with Negative Resistance Observed at ZnO-ZnO Single-Contacts

    Yoshinobu Nakamura, Takeshi Harada, Hitoshi Kuribara, Akira Kishimoto, Naobumi Motohira, Hiroaki Yanagida

    Journal of the American Ceramic Society   82 ( 11 )   3069 - 3074   2004年12月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Wiley  

    DOI: 10.1111/j.1151-2916.1999.tb02204.x

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  • Change in mechanical strength of barium titanate dispersed composite on polarization treatment

    A Kishimoto, S Seo

    ELECTROCERAMICS IN JAPAN VII   269   15 - 18   2004年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TRANS TECH PUBLICATIONS LTD  

    The change in strength of barium titanate/zirconia composite on polarization treatment is evaluated, and the mechanism of this phenomenon is discussed. We have already reported that the bending strength of this composite has increased on longitudinal poling. In this Study bending strength of BT/8YSZ composite increased on longitudinal poling and decreases on transverse poling compared with the untreated samples. Both strengthened and weakened specimens tend to return to the almost original strength by heating over Tc of barium titanate.

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  • Effect of B, Al or Ga on the piezoresistance properties of 6H-SiC ceramics sintered with carbon

    A. Kishimoto, Y. Numata

    J. Ceram. Soc. Jpn.   112 ( 5 )   1402 - 1404   2004年

  • Dispersion Toughening of Ion Conductive Zirconia Ceramics

    A. Kishimoto

    RECENT RESEARCH DEVELOPMENTS IN SOLID STATE IONICS   2   113 - 123   2004年

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  • Non-contact measurement of acoustic emission in thin specimen by laser interferometer

    M Enoki, S Nishinoiri, T Seki, A Kishimoto

    ADVANCES IN NONDESTRUCTIVE EVALUATION, PT 1-3   270-273   485 - 490   2004年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TRANS TECH PUBLICATIONS LTD  

    Acoustic emission (AE) is very useful technique to understand the microfracture behavior in materials. However, it is difficult to monitor AE behavior in small or thin specimen compared with the size of transducer. Recently we developed the non-contact AE measurement system using laser interferometer for various applications, and it was successfully used to detect AE signals of ceramic coating materials during thermal cycle tests. Dielectric strength is a key property for dielectric ceramics such as barium titanate and titania, and it is very important to evaluate dielectric failure in these materials. However, conventional piezoelectric transducer could not be applied to this test. It is difficult to attach a transducer to specimen because thickness of specimen is thin compared with that of mechanical test, and conductivity through transducer is not desired for dielectric breakdown test. We successfully detected AE signals during dielectric breakdown test using laser interferometer. AE sources such as dielectric breakdown and partial discharge were also clearly identified by frequency and location analysis of AE waveforms.

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  • Effect of sodium content on mechanical and electrical properties of preferentially oriented Naβ-alumina ceramics

    A. Kishimoto, K. Shimokawa, S. J. Jung

    J. Mat. Sci. Lett.   22 ( 15 )   1083 - 1085   2003年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1023/A:1024934807879

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  • Effect of alumina addition on microwave sintered ionic conductive zirconia

    A. Kishimoto, Y. Masuda, S. Fujitsu

    Trans. MRS-J   28 ( 4 )   1227 - 1230   2003年

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  • Effect of electric field on creep behavior of dispersion strengthened ion conductive zirconia ceramics

    A. Kishimoto, H. Deguchi, S. Hirano, Y. Nakamura

    Trans. MRS-J   28 ( 4 )   1231 - 1234   2003年

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  • Mechanical and electrical properties of preferentially oriented Naβ-alumina ceramics

    K. Shimokawa, A. Kishimoto

    J. Ceram. Soc. Jpn.   110 ( 5 )   376 - 378   2002年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.2109/jcersj.110.376

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  • Piezoresistivity of Hi-Nicalon type-S silicon carbide-based fiber

    A Kishimoto, G Toyoguchi, H Ichikawa

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   85 ( 2 )   479 - 480   2002年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER CERAMIC SOC  

    Piezoresistivity effect of a silicon carbide-based ceramic fiber (Nicalon family) was evaluated when a single fiber was buried at the tensile plane in a plastic rectangular bar subjected to bending to apply a stable tensile strain. Electrical resistivity change during the bending was monitored by a digital high-resistance meter. From the fracture strain, Young's modulus, and the resistivity change, the piezoresistance coefficient is calculated to be 1.6 x 10(-11) m(2)/N, which is in agreement with the reported value for silicon carbide single crystals and our own reported value for polycrystalline silicon carbide ceramics.

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  • Effect of aluminium addition on piezoresistance coefficient of beta-silicon carbide ceramics

    豊口銀二郎, 岸本昭

    J. Mat. Sci. Lett.,   2002年

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  • Mechanical and electrical properties of rare earth oxide doped zirconia ceramics

    N. Nakamura, A. Kishimoto

    Trans. MRS-J   27 ( 4 )   715 - 718   2002年

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  • Effect of electric field on crack propagation of ceramic composite dispersed with piezoelectric particle

    J. Sato, A. Kishimoto

    Trans. MRS-J   27 ( 4 )   699 - 702   2002年

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  • Precurrent and dielectric breakdown in titania ceramics - Critical current

    T Arakawa, A Kishimoto

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   109 ( 10 )   891 - 893   2001年10月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

    Dielectric breakdown of titania ceramics was investigated with respect to the precurrent which is the current flow before breakdown. The precurrent behavior can be divided into two regions; an electron multiplication region in which carrier electron increases with a constant rate and a critical current increase just before the breakdown. Optical microscopic observation indicated that a part of titania ceramics melted during dielectric breakdown. Relation between critical current and applied electric field, as well as the electric power and heat calculated from the critical current, supported the observed melt of titania ceramics.

    DOI: 10.2109/jcersj.109.1274_891

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  • Microwave sintering of ion conductive zirconia based composite dispersed with alumina

    A Kishimoto, M Ito, S Fujitsu

    JOURNAL OF MATERIALS SCIENCE LETTERS   20 ( 10 )   943 - 945   2001年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:KLUWER ACADEMIC PUBL  

    DOI: 10.1023/A:1010945320700

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  • Polarization dependent mechanical strength of zirconia base composites dispersed with barium titanate

    A Kishimoto, S Seo

    JOURNAL OF MATERIALS SCIENCE LETTERS   20 ( 2 )   97 - 99   2001年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:KLUWER ACADEMIC PUBL  

    DOI: 10.1023/A:1006728227815

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  • Strength control of a ceramic composite by electric field

    A Kishimoto, S Seo

    SMART MATERIALS   4234   321 - 327   2001年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:SPIE-INT SOC OPTICAL ENGINEERING  

    The change in strength of barium titanate/zirconia composite on polarization treatment is evaluated, and the mechanism of this phenomenon is discussed. We have already reported that the bending strength of this composite has increased on longitudinal poling. In this study bending strength of BT/8YSZ composite increased on longitudinal poling and decreases on transverse poling compared with the untreated samples. Both strengthened and weakened specimens tend to return to the almost original strength by heating over Tc of barium titanate. Then, the crack propagation after polarization treatment is observed by SEM, and the detour of cracks around barium titanate grains is found in the cracks going along the poling direction. The detour of crack probably has close connection with the increase in strength in the poling direction.

    DOI: 10.1117/12.424423

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  • EFFECT OF HIGH VOLTAGE SCREENING METHOD ON TITANIA CERAMICS WITH DIFFERENT SURFACE FINISHING

    A. Kishimoto, T. Tanaka

    Ceramic Materials and Components for Engines   229-232   2001年

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  • Fabrication and Piezoresistive Effect of Silicon Carbide ceramics

    G. Toyoguchi, A. Kishimoto

    Trans. MRS-J   2001年

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  • Enhanced IR Sensitivity at the ZnO-ZnO single-junction

    Y. Nakamura, T. Harada, A. Kishimoto

    Trans. MRS-J   2001年

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  • Effect of polarization treatment on bending strength of barium titanate/zirconia composite

    S Seo, A Kishimoto

    JOURNAL OF THE EUROPEAN CERAMIC SOCIETY   20 ( 14-15 )   2427 - 2431   2000年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCI LTD  

    The change in strength of barium titanate/zirconia composite on polarization treatment is evaluated, and the mechanism of this phenomenon is discussed. We have already reported that the bending strength of this composite has increased on longitudinal poling. In this paper, poling time and applied electric field intensity are varied in order to elucidate the strengthening mechanism. Moreover, it is found out that the polarization strengthened specimen can be weakened to the almost original state by heating above T-c of barium titanate. Then, the crack propagation after polarization treatment is observed by SEM, and the detour of cracks around barium titanate grains is found in the cracks going along the poling direction. The detour of crack probably has close connection with the increase in strength in the poling direction. (C) 2000 Elsevier Science Ltd. All rights reserved.

    DOI: 10.1016/S0955-2219(00)00110-2

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  • High-Voltage Screening of Unidirectionally Surface-Ground Titania Ceramics

    Akira Kishimoto, Tomohiro Tanaka

    Journal of the American Ceramic Society   83 ( 6 )   1413 - 1416   2000年6月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Wiley  

    DOI: 10.1111/j.1151-2916.2000.tb01403.x

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  • Role of the Interface in the Temperature Dependence of the Resistivity of Conductive Composite Thin Films

    Shingo Hirano, Akira Kishimoto

    Japanese Journal of Applied Physics   39 ( Part 1, No. 3A )   1193 - 1199   2000年3月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP Publishing  

    DOI: 10.1143/jjap.39.1193

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  • Piezoresistive property of pressureless sintered silicon carbide ceramics(共著)

    Trans. MRS-J   25 ( 7 )   645 - 648   2000年

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  • Thermal shock resistance and creep behavior of dispersion strengthened ion conductive zirconia ceramics(共著)

    Trans. MRS-J   25 ( 1 )   269 - 272   2000年

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  • Two-step varistor action observed at the homojunction made by the ZnO doped with CoO single crystals(共著)

    Trans. MRS-J   25 ( 1 )   265 - 268   2000年

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  • In-situ monitoring of indentation fracture in semiconductive titania ceramics utilizing electric conduction

    N. Sadotani, S. Hirano, A. Kishimoto

    Journal of Materials Science Letters   19 ( 3 )   221 - 223   2000年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Kluwer Academic Publishers  

    In situ monitoring of indentation cracking in dielectric ceramics was examined by introducing a semiconducting region in the surface of the ceramics. Titanium dioxide was employed as the dielectric ceramic. The monitoring sensitivity can be enhanced by controlling the thickness of the conducting layer.

    DOI: 10.1023/A:1006758624648

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  • High-voltage screening on titania ceramics with differently finished surfaces(共著)

    J. Ceram. Soc. Jpn.   108 ( 9 )   795 - 798   2000年

  • Electric control of the chemical reaction in ceramic-ceramic contact interface - Modeling of the reaction scheme

    Y Nakamura, Y Ariga, A Kishimoto, M Miyayama, O Okada, H Yanagida

    JOURNAL OF ELECTROCERAMICS   4   105 - 112   1999年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:KLUWER ACADEMIC PUBL  

    The CuO/ZnO heterocontact is made by stacking CuO and ZnO porous ceramics and its catalytic activity for CO oxidation reaction is evaluated as a function of applied bias. Its catalytic activity is strongly depend on the dc applied bias and when the reverse bias (CuO-, ZnO+) is applied to the heterocontact, the amount of the produced CO2 from the catalytic interface rapidly increases, while it decreases when forward bias is applied. The magnitude of the enhancement of the catalytic activity by reverse applied bias is extremely large (30% for -2.0 V at 320 degrees C), comparing with the results in the gradient composition CuO/ZnO heterocontact. The p-i-n structure is suggested as to the electronic structure of the CuO-ZnO contact interfaces and supposing p-i-n structure, the surface Fermi level position of CuO and ZnO are guessed to move as a function of applied bias. The catalytic reaction over CuO make a large contribute to the whole catalytic reaction at the CuO/ZnO heterocontact and it would be modified by the applied voltage dependent surface Fermi level position of CuO. The working mechanisms of such phenomena are qualitatively discussed by the electronic theory of catalyst proposed by Wolkenstein.

    DOI: 10.1023/A:1009910827420

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  • Conductive coating on structural ceramics for strain detection utilizing electrical measurements

    Shingo Hirano, Akira Kishimoto, Masaru Miyayama

    Journal of the European Ceramic Society   19 ( 12 )   2087 - 2095   1999年10月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier BV  

    DOI: 10.1016/s0955-2219(99)00032-1

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  • Thermal-Electrical Breakdown of Disordered Conductor-Insulator Composites

    Shingo Hirano, Akira Kishimoto

    Japanese Journal of Applied Physics   38 ( Part 2, No. 6A/B )   L662 - L664   1999年6月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP Publishing  

    DOI: 10.1143/jjap.38.l662

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  • Estimation of pore size of porous materials by positron annihilation lifetime measurement

    K Ito, Y Yagi, S Hirano, M Miyayama, T Kudo, A Kishimoto, Y Ujihira

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   107 ( 2 )   123 - 127   1999年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

    Pore size of several porous materials such as zeolites (MCM-41 and MCM-48) and highly fined grain aggregates of zirconia was estimated by means of positron annihilation lifetime measurement. Observed lifetimes of ortho-positronium (over similar to 20 ns, tau(4) and tau(5)) correspond to the meso-pore sizes assessed by conventional porosimetries due to a nitrogen physisorption and a mercury porosimetry. The long-lived lifetime components included an unassigned lifetime component (tau(5)), which was not detected by the other porosimetry. The observed ortho-positronium lifetimes are correlated to the mean size of pores. A relation between relative intensities of the long-lived ortho-positronium components (I-4 and I-5) and specific surface areas is discussed and a variation of a numerical concentration of pores is correlated to the change of the particle sizes of the zirconia aggregates.

    DOI: 10.2109/jcersj.107.123

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  • Effects of alumina dispersion on ionic conduction of toughened zirconia base composite

    A Yuzaki and A. Kishimoto

    Solid State Ionics   116 ( 1-2 )   47 - 51   1999年1月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier BV  

    DOI: 10.1016/s0167-2738(98)00264-1

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  • Composition and Heating Rate Dependencies of Resistivity versus Temperature Behavior in Conductive Composite Thin Films

    S. Hirano, A. Kishimoto

    Key Eng. Mat.   157-1   87 - 90   1999年

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  • Ceramic materials having Strain Sensing Properties-The CaO-NiO Ceramics-(共著)

    Kor. J. Ceram.   5 ( 2 )   165 - 170   1999年

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  • Effects of high-voltage screening on mechanical strengths of titania ceramics measured through different methods

    A. Kishimoto, K. Numazaki, Y. Nakamura

    Journal of Materials Science Letters   18 ( 14 )   1159 - 1161   1999年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Kluwer Academic Publishers  

    The effects of high voltage screening on mechanical strength distributions obtained through three different bending tests of ceramic materials were examined. Cumulative failure probability was calculated using the mean rank method. There is a stress gradient at the bottom face of the bending sample, leading to a positional dependence of stress concentration at a specific shape flaw.

    DOI: 10.1023/A:1006673722467

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  • Monitoring of indentation fracture and bending strain in alpha-SiC ceramics utilizing electrical response 査読

    A Kishimoto, A Nakamichi, Y Nakamura

    JOURNAL OF MATERIALS SCIENCE   34 ( 17 )   4233 - 4237   1999年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:KLUWER ACADEMIC PUBL  

    Propagation of indentation fracture was firstly monitored on alpha-SiC ceramics through a current drop accompanied by the decrease in current conduction area. The current decrease ratio before and after indentation during the constant voltage application was proportional to the crack area formed. However, during the indentation, the current anomalously increased even though the indentation crack propagated. This phenomena is probably due to the piezoresistance effect which has already reported in SiC single crystal. When bending stress was applied to alpha-SiC ceramics, the current increase ratio was proportional to the bending strain. A fracture foreseeing system is proposed for alpha-SiC ceramics in which initial crack monitoring without stress application and bending strain monitoring utilizing the piezoresistance effect are combined. (C) 1999 Kluwer Academic Publishers.

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  • Reliability improvement of titania ceramics with surface flaw through high voltage screening(共著)

    Kor. J. Ceram.   5 ( 4 )   386 - 389   1999年

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  • Effect of Moisture Absorption on Piezoresistance of Conducting Polymer Composite Thin Films

    Shingo Hirano, Akira Kishimoto, Masaru Miyayama

    Japanese Journal of Applied Physics   37 ( Part 2, No. 10A )   L1158 - L1161   1998年10月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP Publishing  

    DOI: 10.1143/jjap.37.l1158

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  • Matrix-Dependent Percolation and Resistivity versus Temperature Behaviors of Conducting Composite Thin Films

    Shingo Hirano, Akira Kishimoto

    Japanese Journal of Applied Physics   37 ( Part 2, No. 10A )   L1190 - L1192   1998年10月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP Publishing  

    DOI: 10.1143/jjap.37.l1190

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  • Thermal history of alumina-toughened ionic conductive zirconia ceramics

    A Yuzaki and A. Kishimoto

    Solid State Ionics   109 ( 3-4 )   273 - 277   1998年6月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier BV  

    DOI: 10.1016/s0167-2738(98)00086-1

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  • Design and fabrication of a strength controllable ceramic composite

    A Kishimoto, H Ishida, Y Nakamura

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   106 ( 5 )   537 - 538   1998年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

    Cubic zirconia base ceramic composites were fabricated by dispersing barium titanate with various contents. Mechanical strength increased on longitudinal poling and decreased on transverse poling. This strength change has been interpreted as being related to internal stresses generated at the matrix/dispersant interface.

    DOI: 10.2109/jcersj.106.537

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  • Improved Mechanical Properties of Ion Conductive Zirconia Ceramics

    A. Kishimoto

    Dynamics of Fast Ions in Solids and Its Evolution for Solid State Ionics   ( 10 )   257 - 262   1998年

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  • PTCR Effect in Composite Conducting Polymer Films

    Shingo Hirano, Akira Kishimoto, Masaru Miyayama

    Journal of Materials Science Letters   17 ( 13 )   1133 - 1135   1998年

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Springer Science and Business Media LLC  

    DOI: 10.1023/a:1006696419446

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  • Enhanced CO and CO2 gas sensitivity of the CuO/ZnO heterocontact made by quenched CuO ceramics

    Yoshinobu Nakamura, Honxia Zhuang, Akira Kishimoto, Osamu Okada, Hiroaki Yanagida

    Journal of the Electrochemical Society   145 ( 2 )   632 - 638   1998年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Electrochemical Society Inc.  

    The CuO/ZnO heterocontacts for carbon monoxide (CO) gas sensors were made using CuO ceramics with different histories, and their gas sensing characteristics were evaluated. The CuO/ZnO heterocontact made by the quenched CuO sintered compact showed enhanced CO and CO2 gas sensitivity, while that made by slowly cooled CuO showed no selective CO gas-sensing characteristics with no CO2 gas sensitivity. The quenched CuO ceramics were thermodynamically stable but the slowly cooled ones were not
    therefore the adsorbed CO molecules on the quenched CuO are thought to be stable and have longer lifetimes. The specific reaction between the adsorbed CO on CuO and adsorbed oxygen on ZnO would be promoted by long lifetime adsorbed CO on CuO and that may be the origin of the enhanced CO gas sensitivity of the quenched-CuO/ZnO heterocontact. The concentrations of cation vacancies of the quenched CuO ceramics can be controlled by controlling the firing temperatures. However, when the CuO ceramics for the CuO/ZnO heterocontact were made by firing and quenching, the ability to be selective in CO gas sensing of the heterocontact was not easily controlled by the control of the defect concentrations of the CuO ceramics.

    DOI: 10.1149/1.1838315

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  • Effect of heating rate on positive-temperature-coefficient-of-resistivity behavior of conductive composite thin films

    S. Hirano, A. Kishimoto

    Applied Physics Letters   73 ( 25 )   3742 - 3744   1998年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A phenomenon was discovered that leads to the selective detection of abrupt increases in the temperature of conductive composite thin films consisting of conductive ceramic fillers and an insulating polymer matrix. Examining the heating rate dependence of the positive-temperature-coefficient-of-resistivity (PTCR) effect provided information about this intelligent phenomenon. The anomalous PTCR effect was observed above 0.3 °C min-1 for all the prepared films. However, the magnitude of the anomaly decreased when the heating rate decreased below 0.1 ° Cmin-1, and when the heating rate further decreased below 0.04 °C min-1, the anomalous resistivity-temperature relationship disappeared. The results suggest that these thin films can selectively detect abrupt increases in temperature, which could lead to an intelligent mechanism. Our results also suggest a PTCR mechanism, in which the expansion of crosslinked polymers in the thermodynamic nonequilibrium state essentially produces the anomaly. © 1998 American Institute of Physics.

    DOI: 10.1063/1.122880

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  • IR Response to the Apparent Resistance of the Nonohmic ZnO-ZnO Homojunction(共著)

    Jpn. Sensor Newsletter, Edison Sensor Technology Center   ( 2 )   30 - 34   1998年

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  • Monitoring of indentation fracture in CuO ceramics utilizing an electrical method

    Akihiro Nakamichi, Akira Kishimoto, Yoshinobu Nakamura, Hiroaki Yanagida

    Journal of Materials Science Letters   17 ( 3 )   249 - 251   1997年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Springer Netherlands  

    DOI: 10.1023/A:1006552832241

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  • Nonlinear current-voltage characteristics of Homojunctions made by zinc oxide single crystals(共著)

    J. Mat. Res. Soc.   458   343 - 347   1997年

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  • High Temperature Strain Sensor Using NiO-Ca0 Solid Solution(共著)

    Jpn. Sensor Newsletter, Edison Sensor Technology Center   11 ( 2 )   19 - 23   1997年

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  • Comparison between the mechanical and dielectric strength distributions for hardened gypsum

    Yoshinobu Nakamura, Mikito Suzuki, Naobumi Motohira, Akira Kishimoto, Hiroaki Yanagida

    Journal of Materials Science   32 ( 1 )   115 - 118   1997年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Springer Netherlands  

    Hardened gypsum is chosen as a simple model of hardened cement materials and an analogy between the mechanical and dielectric strength distributions is investigated. Both of the strengths are evaluated in terms of Weibull statistics and a two-parameter Weibull function is adopted for both of the strength distributions. Both plots show good coincidence which is independent of the water content used during the mixing of hemihydrate gypsum powder for hardening. The hardened gypsum sheets made with 70 wt % of water, have mechanical and dielectric strength distributions that show two different behaviours in the Weibull plots, however, both the plots agree with each other. From our results, it is concluded that the mechanical strength distribution of hardened gypsum can be evaluated in terms of the dielectric strength distribution, which can be easily measured from a breakdown test.

    DOI: 10.1023/A:1018579216679

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  • Toughening of ionic conductive zirconia ceramics utilizing a nonlinear effect 査読

    KI Oe, K Kikkawa, A Kishimoto, Y Nakamura, H Yanagida

    SOLID STATE IONICS   91 ( 1-2 )   131 - 136   1996年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Mechanical and electrical properties of zirconia-based alumina composites as solid electrolyte used in solid oxide fuel cells (SOFC) were examined, in which the alumina addition and its morphology were changed. The bending strength increased with the addition of 0.38 mu m alumina up to 30 mol%, then decreased. In this sample the ionic conductivities almost remained constant up to 30 mol%.

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  • Strength distribution of titania ceramics after high-voltage screening 査読

    A Kishimoto, K Endo, N Motohira, Y Nakamura, H Yanagida, M Miyayama

    JOURNAL OF MATERIALS SCIENCE   31 ( 13 )   3419 - 3425   1996年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:CHAPMAN HALL LTD  

    Screening fields, at or below which 10%, 30% and 50% of TiO2 ceramic samples would break electrically, were applied to samples which show single-mode strength distribution. After these high-voltage screenings, the surviving samples were subjected to mechanical strength measurement and the resultant strength distributions were compared with the original distributions. This high-voltage screening was also applied to model ceramics samples composed of titania with two different relative densities. The effect of high-voltage screening and the correlation between mechanical and dielectric strengths are discussed.

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  • Modified CuO surface appropriate for selective CO gas sensing at CuO/ZnO heterocontact

    SJ Jung, Y Nakamura, A Kishimoto, H Yanagida

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   104 ( 5 )   415 - 421   1996年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

    The surface properties of copper oxide (CuO) were discussed for considering the working mechanism of a CuO/ZnO heterocontact gas sensor having carbon monoxide (CO) gas selectivity. We focused on p-type semiconducting CuO, using sodium as a dopant, which is a key material for selective CO gas sensing and its surface properties were characterized by XPS, TPD and FT-IR analyses. It was found that the Cu/O ratio of the 1 mol% Na2CO3-added CuO surface was higher than that of pure CuO surface by XPS analysis. By TPD analysis, it was found that CO was adsorbed more strongly on 1 mol% Na2CO3-added CuO than on pure CuO. By the in situ IR measurement of CO adsorbed on the surface of 1 mol% Na2CO3-added CuO specimen under 300 degrees C, we found two asymmetric bands of CO, whereas an asymmetric streching CO2 band was found on IR measurement of pure CuO specimen. It was confirmed that Cu atoms on pure CuO surface exposed to CO at 300 degrees C changed from Cu2+ to Cu1+ or Cu-0, in contrast to Cu atoms on 1 mol% Na2CO3-added CuO surface, which changed to Cu2+. The electrical conductivity was measured as a function of temperature for pure CuO, CuO with 1 mol% Na2CO3 and ZnO specimens. The resistivity of ZnO was larger than that of pure CuO and CuO with 1 mol% Na2CO3 by three and six orders of magnitude at 250 degrees C, respectively. A working mechanism of CuO (Na)/ZnO heterocontact gas sensor was elucidated in order to explain its high CO selectivity.

    DOI: 10.2109/jcersj.104.415

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  • Single crystal growth and electrical properties of lanthanum- and gadolinium-doped BaTiO3

    N Motohira, H Okamoto, Y Nakamura, A Kishimoto, M Miyayama, H Yanagida

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   104 ( 4 )   273 - 276   1996年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

    Single crystals of (Ba(0.96-x)Ln(x)Sr(0.04)) TiO3 (Ln=La, Gd) were grown over a composition range of x=0.001 to 0.03. Electrical resistivities of the single crystals were measured by the DC four-probe method. The temperature dependence of resistivities of these crystals changed from semiconductive to metallic at the Curie temperature (T-C). Although the room temperature resistivities of Gd-doped single crystals were independent of Gd concentration of 1 to 3 %, they decreased monotonically with increasing the dopant concentration after annealing in a reducing atmosphere.

    DOI: 10.2109/jcersj.104.273

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  • Reversible electrochromic performance of Prussian blue coated with proton conductive Ta2O5 · nH2O film

    Y Sone, A. Kishimoto, T. Kudo, and K. Ikeda

    Solid State Ionics   83 ( 1-2 )   135 - 143   1996年1月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier BV  

    Electrochromism of Prussian blue (PB) involving proton insertion/extraction was investigated in an aqueous HCl solution using a Ta2O5·nH2O/PB laminate, formed by spin-coating a peroxo-polytantalate solution on an electrodeposited PB film. Reversible and stable electrochromic performance was observed with more than 10000 repeated coloring and bleaching cycles, demonstrating that the film of Ta2O5·nH2O serves as a proton-conductive protecting layer to prevent PB from dissolving in a strong acid solution. Insertion behavior of proton into the PB framework is compared with those for K+, Rb+ and Cs+ by means of a cyclic voltammogram and equilibrium potential measurements. The equilibrium potentials measured as a function of the degree of intercalation have shown that the maximum accommodation of proton is 3.0 (per Fe3+4[Fe11(CN)6]3 unit), which is in agreement with K+ and Rb+. However, the potential-composition curve observed with the PB-proton system is quite different from others not only in the potential range but also in shape, featuring by a conspicuous inflection at the middle region of the intercalation level. The intercalation behaviors are also discussed using a lattice statistical model.

    DOI: 10.1016/0167-2738(95)00226-x

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  • Electric Control the Chemical Reaction at the Ceramic pn Heterocontact

    Japanese Sensor Newsletter EDISON SENSOR TECHNOLOGY CENTER   25 - 27   1996年

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  • SYSTEMATIC EVALUATION OF STRENGTH DISTRIBUTION IN DIELECTRIC CERAMICS THROUGH SIMULTANEOUS LOADING

    K SUGAI, A KISHIMOTO, Y NAKAMURA, N MOTOHIRA, H YANAGIDA

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   103 ( 7 )   730 - 732   1995年7月

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    記述言語:英語   出版者・発行元:CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

    A simultaneous loading system in which fracture stress distribution was substituted by fracture time distribution was previously proposed. However, this method could only be applied to electroconductive materials. In the present study, application of this simultaneous loading system was attempted on insulating materials to which electrical conduction was introduced. A thin gold him is coated on titanium dioxide ceramics to introduce electrical conductivity in them. The average strength and the Weibull modulus were not affected by the conductive coating. It is concluded that our simultaneous loading system can be used in the evaluation of dielectric ceramics and the equivalent strength distribution is obtained.

    DOI: 10.2109/jcersj.103.730

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  • Preparation and lithium intercalation of a new vanadium oxide with a two-dimensional structure

    M Hibino, M. Ugaji, A. Kishimoto and T. Kudo

    Solid State Ionics   79   239 - 244   1995年7月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier BV  

    DOI: 10.1016/0167-2738(95)00068-h

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  • CHANGE OF ELECTRICAL-RESISTANCE IN ELECTRICALLY CONDUCTIVE CERAMIC COMPOSITES UNDER TENSION AND COMPRESSION LOAD 査読

    A ISHIDA, M MIYAYAMA, A KISHIMOTO, H YANAGIDA

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   103 ( 6 )   576 - 581   1995年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

    Electrical and mechanical properties of ceramic composites were investigated in order to establish a fracture prediction technique. Ceramic composites consist of calcium fluoride as an insulating matrix and silicon carbide as electrically conductive additives. An electrical conduction path was formed by adding more than 4 vol% of SiC additives in the composites and the fracture strength increased by the increase of SIC additives. By applying mechanical load, electrical resistance of the composites increased up to fracture under tension while did not change or slightly decreased under compression. The changes in electrical resistance were suggested to occur by the change of connectivity of conduction path in the composites. These results suggest the possibility of predicting fracture in ceramic composites.

    DOI: 10.2109/jcersj.103.576

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  • 「炭素繊維ガラス繊維補強プラスチックにおける自己診断機構の統計的解釈」

    材料システム 金沢工業大学材料システム研究所   14   57 - 63   1995年

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  • Prediction of Fracture from Electrical Resistance Measurements in Electrically Conductive Composites

    J.Ceram.Soc.Jpn   103 ( 6 )   576 - 581   1995年

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  • A Simultaneous Loading System to Evaluate the Structural Reliability of Brittle Materials

    Akira Kishimoto, Kazuhito Sugai, Yoshinobu Nakamura, Naobumi Motohira, Hiroaki Yanagida

    Journal of the American Ceramic Society   78 ( 8 )   2251 - 2253   1995年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    An alternative method to obtain a strength distribution of many test pieces simultaneously has been proposed. In this method, the bending stress of all subjected samples is simultaneously increased by utilizing their elastic modulus constancy, and the fractured sample number is monitored by the change in electric conductance. Copyright © 1995, Wiley Blackwell. All rights reserved

    DOI: 10.1111/j.1151-2916.1995.tb08649.x

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  • CO Gas Sensing by Na+ Added Porous CuO-ZnO Ceramic Sensor

    Japanese Sensor Newsletter EDISON SENSOR TECHNOLOGY CENTER   9 ( 3 )   16 - 20   1995年

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  • Effect of High‐Voltage Screening on Strength Distribution for Titanium Dioxide Ceramics

    Akira Kishimoto, Koretomo Endo, Yoshinobu Nakamura, Naobumi Motohira, Hiroaki Yanagida, Kazuhito Sugai

    Journal of the American Ceramic Society   78 ( 8 )   2248 - 2250   1995年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A screening field at or below which 30% of TiO2 ceramic samples break electrically was applied to the samples. After high‐voltage screening, the surviving samples were subjected to mechanical strength measurement and the resulting strength distribution was compared to the original distribution. The effect of high‐voltage screening and the correlation between mechanical and dielectric strength are discussed. There is a correlation between mechanical and dielectric strengths with a correlation coefficient of 0.77, which indicates the validity of high‐voltage screening. Copyright © 1995, Wiley Blackwell. All rights reserved

    DOI: 10.1111/j.1151-2916.1995.tb08648.x

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  • High voltage screening on ceramics parts with bimodal strength distribution

    Koretomo Endo, Akira Kishimoto, Naobumi Motohira, Yoshinobu Nakamura, Hiroaki Yanagida

    Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan   103 ( 1202 )   1090 - 1092   1995年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Ceramic Soc of Japan  

    The effect of high voltage screening on ceramics parts composed of titania ceramics with relative densities of 60 and 90%, was examined. Before screening, strength distribution was clearly discriminated into two regions, high strength region and low strength region. The dielectric strength was measured on the low strength samples, and the electric field below which all of the low strength parts would break was estimated as a screening field. After electric screening, the mechanical strength was measured and compared with the original one. Ceramic parts composed of only high strength region were obtained by eliminating the low strength parts electrically.

    DOI: 10.2109/jcersj.103.1090

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  • Characterization of amorphous tungsten trioxide thin films prepared by rf magnetron sputtering method

    Tokuro Nanba, Tadashi Takahashi, Jun Takada, Akiyoshi Osaka, Yoshinari Miura, Itaru Yasui, Akira Kishimoto, Tetsuichi Kudo

    Journal of Non-Crystalline Solids   178 ( C )   233 - 237   1994年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Amorphous tungsten trioxide thin films were prepared using a rf magnetron sputtering method. The relation between structure and electrochromic properties was investigated. At the macroscopic level, the films had dense structures. From Raman spectroscopic and X-ray radial distribution analyses, it was deduced that the networks were basically formed by three-, four- and six-membered rings of corner-sharing WO6 octahedra, and in the films with low O/W atomic ratios many edge-sharing units were present. It was also found that the films with high O/W ratios showed good electrochromic properties, which were closely related to the six-membered rings. © 1994.

    DOI: 10.1016/0022-3093(94)90290-9

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  • Coloration dynamics of tungsten oxide based all solid state electrochromic device

    Yongming Li, Yoshihiro Aikawa, Akira Kishimoto, Tetsuichi Kudo

    Electrochimica Acta   39 ( 6 )   807 - 812   1994年4月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier BV  

    DOI: 10.1016/0013-4686(93)e0003-5

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  • Electrochromic thin films coated from peroxo-polymolybdotungstate solutions

    Sanae Takano, Akira Kishimoto, Koichiro Hinokuma, Tetsuichi Kudo

    Solid State Ionics   70-71 ( 1 )   636 - 641   1994年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Peroxo-polymolybdotungstates are formed by the direct reaction of a mixture of metallic Mo and W (for example, 5:5 mixture) with hydrogen peroxide solution. A homogeneous and amorphous thin film (0.4 microm, typically) is fabricated on an ITO glass substrate by spin-coating using such a solution. After heat-treatment at 120°C, it exhibits electrochromism excellent in both reversibility and response time in an organic Li-electrolyte. The film colored at -1 V (versus Ag/AgCl) shows rather flat absorption spectrum. Its color is dark grayish blue and the ΔOD between -1 and +0.5 V reaches 0.7 at 670 nm (λmax). Kinetic aspect of such electrochromic films will also be dicussed. © 1994.

    DOI: 10.1016/0167-2738(94)90385-9

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  • Amorphous tantalum oxide proton conductor derived from peroxo-polyacid and its application for EC device

    Y. Sone, A. Kishimoto, T. Kudo

    Solid State Ionics   70-71 ( 1 )   316 - 320   1994年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Two kinds of solid state ECD prototypes were fabricated by combining electrochromic films and a Ta2O5·nH2O proton conducting film. Electrochromic characteristics of these devices were comparable to those using liquid electrolyte. We also demonstrated reversible EC characteristics of Prussian blue with insertion and extraction of proton, using a Ta2O5·nH2O film. © 1994.

    DOI: 10.1016/0167-2738(94)90329-8

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  • Hexagonal and pyrochlore-type cesium tungstates synthesized from cesium peroxo-polytungstate and their intercalation chemistry

    Junko Oi, Akira Kishimoto, Tetsuichi Kudo

    Solid State Ionics   72 ( 2 )   204 - 208   1994年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Electrochemical intercalation of Li into hexagonal- and pyrochlore-type cesium tungstates (CsyW1-y/6O3
    y=0.3 and 0.5, respectively), and their bronzes (CsyWO3) derived from cesium peroxo-polytungstates was investigated in a 1M LiClO4/PC. Intercalation characteristics of those compounds are discussed in relation to their structures. © 1994.

    DOI: 10.1016/0167-2738(94)90148-1

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  • Coloration Dynamics of Spin-Coated MoO3 • n H2O Electrochromic Films Fabricated from Peroxo-polymolybdate Solution

    Koichir Hinokuma, Tetsuichi Kudo

    Journal of the Electrochemical Society   141 ( 4 )   876 - 879   1994年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A very smooth amorphous molybdenum oxide thin film can be fabricated easily by a spin-coating technique using a solution of peroxo-polymolybdic acid, which is formed by the direct reaction of metallic molybdenum with hydrogen peroxide, Amorphous MoO3 • n H2O resulting from heating such a film at 80-150°C exhibited reversible electrochromism in an organic electrolyte solution. However, its electrochromic characteristics depended on the heating temperature. Coloration dynamics of films treated at various temperatures were investigated by a potential step method. When the film was treated at temperatures as high as 150°C, its coloration process was diffusion controlled, while the transient current observed with films treated at lower temperature did not obey the Cottrell-type relationship. Such behavior is discussed in relation to the structural features of the amorphous MoO3 • n H2O films. © 1994, The Electrochemical Society, Inc. All rights reserved.

    DOI: 10.1149/1.2054850

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  • PHOTOREACTION MECHANISM FOR AMORPHOUS PEROXO POLYTUNGSTIC ACID AS AN INORGANIC PHOTORESIST MATERIAL 査読

    A KISHIMOTO, N MATSUZAKI, T KUDO

    ADVANCED MATERIALS '93, II - A & B   15 ( A & B )   307 - 308   1994年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:ELSEVIER SCIENCE PUBL B V  

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  • Proton conductivity of spin-coated Ta2O5·nH2O amorphous thin films from peroxo-polytantalate solution

    Y SONE, A KISHIMOTO, T KUDO

    Solid State Ionics   66 ( 1-2 )   53 - 59   1993年10月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier BV  

    DOI: 10.1016/0167-2738(93)90028-2

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  • Transitional current analysis useful for intercalation electrode/solid electrolyte systems

    Tetsuichi Kudo, Yoshihiro Aikawa, Yong ming Li, Akira Kishimoto

    Solid State Ionics   62 ( 1-2 )   99 - 104   1993年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    We have derived theoretical forms of the transition current to be induced when an electrochemical cell consisting of a solid electrolyte and an intercalation-type electrode is driven by an external source of a constant voltage, for both cases that the kinetics is controlled by the charge transfer and by the diffusion. Experimental data taken with a solid state cell, Li| polymer electrolyte|WO3, ITO, are analyzed on these bases. The results demonstrate that chrono-amperometric analysis can be successfully performed using such a cell without a reference electrode. © 1993.

    DOI: 10.1016/0167-2738(93)90256-3

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  • Hexagonal tungsten bronze synthesized from potassium peroxo-polytungstate and its electrical properties

    Isao Tsuyumoto, Akira Kishimoto, Tetsuichi Kudo

    Solid State Ionics   59 ( 3-4 )   211 - 216   1993年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Peroxo-polytungstic acid, formed by the direct reaction of metallic tungsten with hydrogen peroxide, precipitated an amorphous salt with potassium bromide. Decomposing the precipitate at 400-800°C in air yielded white hexagonal potassium tungstate, KxWO3+ x 2 (x=0.3), with lattice parameters of a=7.31 and c=7.65 Å. On the other hand, thermal decomposition in a reducing atmosphere (H2/H2O) at 500°C gave dark blue hexagonal tungsten bronze (HTB), KxWO3, with a=7.38 and c=7.52 Å, which were almost identical to those reported for HTB. It was found that the redox reaction between tungstate and HTB was completely reversible. A porous pellet of the present HTB showed metallic conductivity (≈10 S/cm, at 25°C) under dry conditions. In a wet atmosphere with only slight humidity, however, its conductivity was dramatically reduced. The conductivity was recovered by treating it again in a dry condition. © 1993.

    DOI: 10.1016/0167-2738(93)90052-5

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  • Hexagonal and pyrochlore-type cesium tungstate synthesized from cesium peroxo-polytungstate and their redox chemistry

    Junko Oi, Akira Kishimoto, Tetsuichi Kudo

    Journal of Solid State Chemistry   103 ( 1 )   176 - 185   1993年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Thermal decomposition of cesium peroxo-polytungstate, an amorphous precursor, yielded not only pyrochlore-type but also hexagonal WO3-type cesium tungstate, depending on the Cs/W ratio (x) in the precursors
    the former is in the range 0.48 ≤ x ≤ 0.54 and the latter 0.30 ≤ x ≤ 0.34. Mixtures of these two phases were formed in the intermediate region of x. On reduction at 700°C, the pyrochlore phase gave a compound with the same framework, with its cubic cell parameter being elongated from 10.25 to 10.32 Å, but reoxidation resulted in a mixture of pyrochlore and hexagonal phases. In contrast, reduction and oxidation of the hexagonal phase at 600°C was reversible. Powder XRD profile refinements were performed with reduced and oxidized hexagonal cesium tungstates (x = 0.30) in the space group P 63/mcm. The former compounds (a = 7.4049(1) and c = 7.6098(1)) are based on an almost idealized h-WO3 framework with Cs sitting on its large 2b interstices (Rf = 0.0240). The oxidized compounds (7.4012(18) and 7.6728(17)Å Rf = 0.007) possessed a lacunar tungsten sublattice. © 1993 Academic Press, Inc.

    DOI: 10.1006/jssc.1993.1090

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  • Oxygen molecules stably caged in a UV irradiated thin film from peroxo polytungstic acids

    Akira Kishimoto, Naosuke Matsuzaki, Tetsuichi Kudo

    Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan   101 ( 1169 )   143 - 144   1993年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Peroxo polytungstic acids are promising inorganic resist materials which become insoluble in water by UV irradiation. After UV irradiation, part of oxygen molecules, decomposition product of the peroxo groups, was stably caged in the amorphous network. This mechanism is discussed in connection with the densification of thin films during UV irradiation.

    DOI: 10.2109/jcersj.101.143

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  • ペルオキソポリタングステン酸系無機レジストの遠紫外光照射による構造変化

    Akira KISHIMOTO, Naosuke MATSUZAKI, Mitsuhiro HIBINO, Tetsuichi KUDO

    ( 9 )   1041 - 1046   1993年

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1246/nikkashi.1993.1041

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  • Amorphous tantalum and niobium oxide proton conductors derived from respective peroxo polyacids

    A. Kishimoto, T. Kudo, T. Nanba

    Solid State Ionics   53-56 ( 2 )   993 - 997   1992年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Tantalum and niobium based amorphous solids were prepared by drying respective peroxo polyacids. Peroxo-polytantalate (Ta-IPA) was obtained by a direct reaction of Ta(OC2H5)5 with H2O2, and its Nb-analogue (Nb-IPA) was synthesized by dissolving metallic Nb in H2O2. Niobium carbide also gave a pale yellow solution (Nb-IPA) with H2O2, which had carbon incorporated as a hetero atom. Alternating current electrical conductivity measurements were carried out with pellet samples. Each specimen showed similar temperature dependency indicating its proton conductive mechanism was the same. The conductivity of Ta-IPA solid was larger than those of the others (e.g. 3.9×10-6 S cm-1, 27°C). Conduction mechanisms are discussed i relation to the water content and the structure of these materials. © 1992.

    DOI: 10.1016/0167-2738(92)90282-T

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  • Hexagonal tungsten trioxide obtained from peroxo-polytungstate and reversible lithium electro-intercalation into its framework

    Junko Oi, Akira Kishimoto, Tetsuichi Kudo, Masahiko Hiratani

    Journal of Solid State Chemistry   96 ( 1 )   13 - 19   1992年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A hexagonal form of WO3 (a = 7.3244(6), c = 7.6628(5), Å, z = 6) was synthesized by the low temperature sintering of an ammonium peroxo-polytungstate precursor. This compound, the N/W ratio of which is 0.015 at most, is not identical to reported hexagonal WO3 from WO3 ·1/3H2O because its c-axis is significantly shorter than that of the latter (7.798 Å). Powder, XRD profile refinements were performed in the space group P63/mcm. We found two kinds of structural models that showed reasonably good profile agreement (R0.07). Both models are built up of remarkably distorted WO6 octahedra, in which part of the O-O distances are very short (2.32 ≈ 2.42, Å). Electrochemical intercalation of lithium into the present WO3 framework was investigated using a Li|LiPF6|WO3 cell. It was found that Li was intercalated reversibly up to the composition Li1.0WO3. © 1992 Academic Press, Inc.

    DOI: 10.1016/S0022-4596(05)80292-0

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  • Amorphous structure of Ta<sub>2</sub>O<sub>5</sub>・nH<sub>2</sub>O derived from peroxa-polytantalate solution

    J. Solid State Chem   90   1992年

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  • Electrochromism of Spin-coated Mo03. nH<sub>2</sub>O thin films from peroxo-polytungstate

    Solid state Ionics   53,56,507-512   1992年

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  • The influence of internal stress on the amorphous structure of wet-coated films derived from peroxopolytantalate solution

    A. Kishimoto, H. Sugimoto, T. Nanba, T. Kudo

    Thin Solid Films   204 ( 1 )   L5 - L8   1991年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/0040-6090(91)90486-H

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  • Microstructure dependence of mechanical and dielectric strengths—i. porosity

    Akira Kishimoto, Kunihito Koumoto, Hiroaki Yanagida, Masanobu Nameki

    Engineering Fracture Mechanics   40 ( 4-5 )   927 - 930   1991年1月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier BV  

    DOI: 10.1016/0013-7944(91)90253-w

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  • Coloration Dynamics of spin-coated amerphous WO<sub>3</sub>・nH<sub>2</sub>O electrodromic films from peroxa-paly tungstate salution

    T. Kudo, S. Takano, A. Kishimoto, Y. Aikawa, rom peroxo-polytungsutate solution

    Denki Kagaku   59 ( 8 )   718 - 719   1991年

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  • 「過酸化ポリタングステン酸を出発原料とするフレームワーク化合物の合成と電気化学特性」

    日本化学会誌   10   1296 - 1300   1991年

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  • Spin-coated Ta2O5·nH2O films derived from peroxo poly-tantalate solution

    A KISHIMOTO, T NANBA, T KUDO

    Solid State Ionics   40-41   903 - 905   1990年8月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier BV  

    DOI: 10.1016/0167-2738(90)90149-l

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  • Synthesis of new WO3-based complex oxides with tunnels by a chemical mixing process using peroxo-polytungstates

    T KUDO, A KISHIMOTO, J OI, H INOUE

    Solid State Ionics   40-41   567 - 571   1990年8月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier BV  

    DOI: 10.1016/0167-2738(90)90072-y

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  • Mechanical and dielectric failure of BaTiO3 ceramics

    Akira Kishimoto, Kunihito Koumoto, Hiroaki Yanagida

    Journal of Materials Science   24 ( 2 )   698 - 702   1989年2月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Springer Science and Business Media LLC  

    DOI: 10.1007/bf01107462

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    その他リンク: http://link.springer.com/article/10.1007/BF01107462/fulltext.html

  • Mechanical Strengths of BaTiO3 Thick Films after Dielectric Breakdown

    Akira KISHIMOTO, Kunihito KOUMOTO, Hiroaki YANAGIDA

    Journal of the Ceramic Society of Japan   96 ( 1116 )   847 - 851   1988年

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Ceramic Society of Japan  

    DOI: 10.2109/jcersj.96.847

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  • Analogy between Mechanical and Dielectric Strength Distributions in BaTiO3 Thick Films Prepared under the Different Processing Conditions

    Akira KISHIMOTO, Masaya NAKANO, Satoru FUJITSU, Kunihito KOUMOTO, Hiroaki YANAGIDA

    Journal of the Ceramic Society of Japan   96 ( 1117 )   954 - 957   1988年

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Ceramic Society of Japan  

    DOI: 10.2109/jcersj.96.954

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▼全件表示

書籍等出版物

  • Materials chemistry of ceramics

    北條, 純一

    Springer Nature  2019年  ( ISBN:9789811399343

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    総ページ数:x, 233 p.   記述言語:英語

    CiNii Books

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  • "Superplastically foaming method to make closed pores inclusive rigid ceramics"

    Nova Science Publishers, Inc.  2016年 

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  • エネルギーの貯蔵・輸送

    NTS  2008年 

     詳細を見る

  • セラミックス材料化学

    丸善、日本化学会  2005年 

     詳細を見る

  • イオン伝導性材料の設計・合成とその応用-イオン伝導性固体,イオン性液体-増補改訂版

    ティー・アイ・シー  2005年 

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  • セラミックス工学ハンドブック・エンジニアリングセラミックス

    技報堂  2002年 

     詳細を見る

  • 先端無機材料科学

    昭晃堂  2000年 

     詳細を見る

  • セラミック材料用語辞典

    工業調査会  1999年 

     詳細を見る

  • 「工業材料大事典」, 分担

    産業調査会 

     詳細を見る

  • 「(続)電気化学測定法」分担

    電気化学協会 

     詳細を見る

  • 「セラミックスファイバーの電力設備への適用研究」分担

     詳細を見る

  • Structure of novel peroxopoly acid and its applieations for inorganic resist and framework compound

    Elservier Sci. Pubs. B. V. 

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  • 「先端無機材料学」, 分担

    昭晃堂 

     詳細を見る

  • 「セラミックス用語辞典」, 分担

    日刊工業新聞 

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▼全件表示

MISC

  • 誘電体界面がリチウムイオン電池の電荷移動機構に与える効果

    寺西貴志, 香西海星, 岸本昭, 石田国大, 中山将伸, 安原颯, 安井伸太郎, 伊藤満

    日本セラミックス協会年会講演予稿集(CD-ROM)   2020   2020年

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  • 誘電体界面がリチウムイオン電池の電荷移動機構に与える影響

    香西海星, 石田国大, 安原颯, 安井伸太郎, 寺西貴志, 岸本昭, 中山将伸, 伊藤満

    セラミックス基礎科学討論会講演要旨集   58th   2020年

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  • Solid State Ceramics Foams utilizing their Superplasticity

    A. Kishimoto

    J. Tech. Assoc. Refract. Jpn.   37 ( 4 )   198 - 203   2017年

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  • 高熱伝導性AlNセラミックスのミリ波焼結

    岸本昭, 森本徹也, 荻原康弘, 林秀考

    粉体および粉末冶金   56 ( 6 )   377 - 382   2009年6月

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    記述言語:日本語   掲載種別:書評論文,書評,文献紹介等  

    DOI: 10.2497/jjspm.56.377

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  • 超塑性発泡法による高気密多孔体作製と閉気孔パターンニング

    岸本昭

    J. Soc. Inorg. Mater. Jpn.   16 ( 339 )   76 - 82   2009年

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  • 化学者の二千円札

    岸本昭

    Need 2008 Report   35   17   2009年

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  • Superplasticity in ceramics - A new application

    A. Kishimoto

    J. Tech. Assoc. Refract. Jpn.   29 ( 1 )   未設定   2009年

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  • セラミックスを完全緻密化したあと所望箇所に空洞を作製-超塑性発泡法の開発

    岸本昭

    中小企業 岡山   578 ( 12 )   13   2009年

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  • 高温圧力センサー

    岸本昭

    岡山大学大学院自然科学研究科プロジェクト2008成果報告書   ( 4 )   40 - 42   2009年

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  • 超塑性発泡法を用いた非繊維断熱材の創製

    岸本昭

    国土技術研究センター報告集   35 - 40   2009年

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  • ミリ波焼結による高熱伝導性AlNセラミックスの作製

    岸本昭

    岡山大学重点プロジェクト平成20年度成果報告書   ( 4 )   23 - 33   2009年

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  • 航空機用高気密・軽量セラミックス断熱材の設計と製造(2)

    岸本昭

    平成20年ものづくりの高度化に関する基盤技術研究   ( 3 )   108 - 117   2009年

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  • 高温圧力検知へのアプローチ

    和久公則, 岸本昭

    セラミックス   44 ( 3 )   149 - 153   2009年

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  • Controlled patterns of closed pores utilizing the superplastically foaming method

    A. Kishimoto, Y. Nishino, H. Hayashi

    Proceedings of the 26th International Japan-Korea Seminar on Ceramics   ( 11 )   291 - 294   2009年

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  • 超塑性を利用したセラミックス閉気孔の三次元パターンニング

    岸本昭

    Annual Report of O.S.G. Fund   ( 17 )   59 - 61   2009年

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  • 超塑性発泡法によるセラミックス中への自在形状閉気孔の形成

    岸本昭

    第49回事業報告書平成20年度   80 - 81   2009年

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  • 燃焼圧を直接検知可能な高温圧力センサー

    岸本昭

    岡山大学大学院自然科学研究科プロジェクト2007成果報告書   61 - 63   2008年

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  • Mechanical and magnetic properties of the isotropic negative thermal expansion material, Mn3Cu1-xGexN

    Y. Nakamura, K. Takenaka, A. Kishimoto, H. Takagi

    3rd Inter. Workshop on Adv. Ceram. (IWACO3)   2008年

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  • 航空機用高気密・軽量セラミックス断熱材の設計と製造(1)

    岸本昭

    平成19年ものづくりの高度化に関する基盤技術研究   ( 3 )   115 - 124   2008年

     詳細を見る

  • 超塑性発泡法による多孔質セラミックスの作製と特性評価

    岸本昭

    岡山大学重点プロジェクト平成19年度成果報告書   43 - 52   2008年

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  • Mechanical and Electrical properties of ceramic materials

    A. Kishimoto

    Proceedings of the 25th International Japan-Korea Seminar on Ceramics   ( 11 )   33 - 36   2008年

     詳細を見る

  • 燃焼圧を直接検知可能な高温圧力センサー

    岸本昭

    岡山大学大学院自然科学研究科プロジェクト2007成果報告書   ( 4 )   61 - 63   2008年

     詳細を見る

  • 超塑性発泡法による多孔質セラミックスの作製と特性評価

    岸本昭

    岡山大学重点プロジェクト平成19年度成果報告書   ( 4 )   43 - 52   2008年

     詳細を見る

  • Mechanical and Electrical properties of ceramic materials

    A. Kishimoto

    Proceedings of the 25th International Japan-Korea Seminar on Ceramics   33 - 36   2008年

     詳細を見る

  • ミリ波によるセラミックスのプロセッシング

    岸本昭

    夢の融合産学官研究マッチング3・テキスト   1 - 2   2008年

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  • 添加物により超塑性を促進して作製した完全安定化ジルコニア基固相発泡体

    橋田由梨, 林秀考, 岸本昭

    粉体および粉末冶金   54 ( 11 )   740 - 743   2007年11月

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    記述言語:日本語  

    DOI: 10.2497/jjspm.54.740

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  • セラミックスによる高温圧力センサー

    岸本昭

    夢の融合産学官研究マッチング2・テキスト   35-39   2007年

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  • 焼き餅のように膨らんだセラミックス

    岸本昭

    岡山大学広報誌”いちょう並木”   ( 40 )   5   2007年

     詳細を見る

  • セラミックスの超塑性-新しい利用法-

    岸本昭

    耐火物   59[8]390-396   2007年

     詳細を見る

  • Superplasticity foaming of titania based ceramics and their properties

    A. Kishimoto, M. Obata, H. Hayashi

    Proceedings of the 24th International Japan-Korea Seminar on Ceramics   309 - 312   2007年

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  • 窒化アルミニウムおよび窒素を共添加した炭化ケイ素セラミックスのピエゾ抵抗効果

    岡田泰行, 林秀考, 岸本昭

    粉体および粉末冶金   53 ( 11 )   876 - 879   2006年11月

     詳細を見る

    記述言語:日本語  

    DOI: 10.2497/jjspm.53.876

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  • 窒化アルミニウムおよび窒素を共添加した炭化ケイ素セラミックスのピエゾ抵抗効果

    岡田泰行, 林秀考, 岸本昭

    粉体および粉末冶金   53 ( 11 )   876 - 879   2006年11月

     詳細を見る

    記述言語:日本語  

    DOI: 10.2497/jjspm.53.876

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  • セラミック材料-多様な電気特性-

    岸本昭

    平成18年度日本材料学会中四国支部講習会「ものづくり材料学」テキスト   23-40   2006年

     詳細を見る

  • 構造物の損傷履歴を記憶する全面塗布膜に関する研究

    岸本昭

    大林都市研究振興財団報告書   2006年

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  • Piezoresistance properties of silicon carbide ceramics doped with aluminum nitride and nitrogen

    A. Kishimoto, Y. Okada, H. Hayashi

    Proceedings of the 23rd International Japan-Korea Seminar on Ceramics   ( 11 )   87 - 90   2006年

     詳細を見る

  • 構造物の損傷履歴を記憶する全面塗布膜に関する研究

    岸本昭

    大林都市研究振興財団報告書   2006年

     詳細を見る

  • 高電圧スクリーニングによる高信頼性部材の選別

    岸本昭

    セラミックデータブック06   34[88]47-52   2006年

     詳細を見る

  • Piezoresistance properties of silicon carbide ceramics doped with aluminum nitride and nitrogen

    A. Kishimoto, Y. Okada, H. Hayashi

    Proceedings of the 23nd International Japan-Korea Seminar on Ceramics   87-90   2006年

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  • 高電圧スクリーニングによる高信頼性部材の選別

    岸本昭

    セラミックデータブック06   34 ( 88 )   47 - 52   2006年

     詳細を見る

  • セラミック材料-多様な電気特性-

    岸本昭

    平成18年度日本材料学会中四国支部講習会「ものづくり材料学」テキスト   23 - 40   2006年

     詳細を見る

  • 超塑性発泡法による高強度高温真空断熱材

    岸本昭

    夢の融合産学官研究マッチング1・テキスト   ( 12 )   56 - 58   2006年

     詳細を見る

  • 超塑性発泡法による高強度高温真空断熱材

    岸本昭

    夢の融合産学官研究マッチング1・テキスト   56-58   2006年

     詳細を見る

  • 高温歪み検知特性を有する炭化珪素基セラミックス

    岸本昭

    ANNUAL REPORT OF THE MURATA SCIENCE FOUNDATION   19,203-210   2005年

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  • High temperature piezoresistance properties of 6H-SiC ceramics doped with trivalent elements

    A. Kishimoto, Y. Okada, H. Hayashi

    Proceedings of the 22nd International Japan-Korea Seminar on Ceramics   ( 11 )   449 - 452   2005年

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  • 高度ディジタルEMC協調統合設計

    岸本昭

    岡山大学重点プロジェクト平成16年度成果報告書   分担   2005年

     詳細を見る

  • PAC RIM IVに参加して

    岸本昭

    吉田科学技術財団ニュース   2003年

     詳細を見る

  • セラミックスの高信頼化のための高電圧スクリーニング法の開発

    岸本昭

    旭硝子財団助成研究成果報告2003   53-54   2003年

     詳細を見る

  • 炭化珪素セラミックスのビエゾ抵抗効果に関する研究

    岸本昭

    日本板硝子材料工学助成会   21,135-139   2003年

     詳細を見る

  • ナトリウムイオン伝導性セラミックスの最適配向性

    岸本昭

    ソルトサイエンス財団平成13年度助成研究報告集Ⅰ理工学・農学編   55-65   2003年

     詳細を見る

  • セラミックスの高信頼化のための高電圧スクリーニング法の開発

    岸本昭

    旭硝子財団助成研究成果報告2003   53 - 54   2003年

     詳細を見る

  • 炭化珪素セラミックスのビエゾ抵抗効果に関する研究

    岸本昭

    日本板硝子材料工学助成会   21   135 - 139   2003年

     詳細を見る

  • 燃焼圧直接測定のための高温圧力センサー

    岸本昭

    谷川熱技術振興基金機関誌   2003年

     詳細を見る

  • ナトリウムイオン伝導性セラミックスの最適配向性

    岸本昭

    平成13年度助成研究報告集Ⅰ理工学・農学編   ( 3 )   55 - 65   2003年

     詳細を見る

  • Role of aluminum in fabrication and piezoresistive effect of silicon carbide ceramics

    G Toyoguchi, A Kishimoto

    ASIAN CERAMIC SCIENCE FOR ELECTRONICS II AND ELECTROCERAMICS IN JAPAN V, PROCEEDINGS   228-2   251 - 254   2002年

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    記述言語:英語   出版者・発行元:TRANS TECH PUBLICATIONS LTD  

    Piezoresistance coefficient was measured by changing the addition of alumina +yttria or aluminum into silicon carbide ceramics. In the case of liquid phase sintering aids (alumina + yttria), piezoresistance coefficient is almost independent of the amount of sintering aids from 1 to 20 wt%. The piezoresistance coefficient increases with increasing the aluminum addition within its solid solution limit. Temperature dependency of piezoresistance coefficient is large in silicon carbide with large amount of aluminum addition.

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  • ポジトロニウム消滅寿命によるエポキシ樹脂中の自由体積空孔の可塑効果

    伊藤賢志, 平野晋吾, 岸本昭, 宮山勝, 氏平祐輔

    ラジオアイソトープ   51 ( 2 )   60 - 65   2002年

  • 導電性複合体塗布膜による歪み検知

    岸本昭

    研究成果報告1993-2000   ( 6 )   283 - 285   2002年

     詳細を見る

  • Role of aluminum in fabrication and piezoresistive effect of silicon carbide ceramics

    G Toyoguchi, A Kishimoto

    ASIAN CERAMIC SCIENCE FOR ELECTRONICS II AND ELECTROCERAMICS IN JAPAN V, PROCEEDINGS   228-2   251 - 254   2002年

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    記述言語:英語   出版者・発行元:TRANS TECH PUBLICATIONS LTD  

    Piezoresistance coefficient was measured by changing the addition of alumina +yttria or aluminum into silicon carbide ceramics. In the case of liquid phase sintering aids (alumina + yttria), piezoresistance coefficient is almost independent of the amount of sintering aids from 1 to 20 wt%. The piezoresistance coefficient increases with increasing the aluminum addition within its solid solution limit. Temperature dependency of piezoresistance coefficient is large in silicon carbide with large amount of aluminum addition.

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  • 高電圧スクリーニングによるセラミックス材料の高信頼化

    岸本昭

    材料科学研究助成 研究成果報告 第15集   ( 5 )   60 - 65   2002年

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  • フィラー充填構造への高電圧印加による発光現象

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    平成12年度助成研究報告集Ⅰ理工学・農学編   49 - 59   2002年

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  • ワールドマテリアルセンター構築調査研究

    岸本昭, ファインセラミックスセンタ

    平成13年度素材産業技術対策調査   分担   2002年

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    セコム研究報告集No.21   ( 21 )   41 - 44   2002年

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    前田記念工学振興財団研究成果報告1993-2000   283-285   2002年

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  • 高電圧スクリーニングによるセラミックス材料の高信頼化

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    (財)材料科学研究助成 基金材料科学研究助成 研究成果報告 第15集   60-65   2002年

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  • ワールドマテリアルセンター構築調査研究

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    生研ニュース(FRONTIER)   ( 76 )   2002年

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    化学と教育   49[3]132-134   2001年

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    財団法人トステム建材産業振興財団第7回(平成10年度)研究助成成果報告書   117-124   2001年

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    Japan-America FRONTIERS OF ENGINEERING Symposium 2000 Proceedings   13-24   2001年

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    The Mitsubishi Foundation Annual Report 2000   [31]259-261   2001年

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  • 自己診断性材料を用いたコンクリート構造体の破壊・損傷検知に関する研究(自己診断メカニズムの探求)

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    平成12年度運輸分野における基礎的研究推進制度成果報告集   2001年

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    平成12年度通商産業省工業技術院委託   2001年

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    財団法人ホソカワ粉体工学振興財団 年報   [8]155-164   2001年

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    (財)セコム科学技術振興財団セコム研究報告集No.21   [21]41-44   2001年

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  • ダイナミック電気応答を示す有機高分子-無機フィラー複合体-電気的特性と近年の研究展開-

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  • 鉄筋・鉄骨コンクリートの健全性評価方法の標準化のための調査研究成果報告書

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    インテリジェント材料   10[1]5-10   2000年

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  • The effect of ambient gases on the carrier transport through the YBa2Cu3O7-d/ZnO heterocontact interface

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    MASS AND CHARGE TRANSPORT IN INORGANIC MATERIALS   2000年

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    生産研究   2000年

  • 昇温速度に感応して自己制御するインテリジェントヒーター

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    平成10年度通商産業省工業技術院委託   分担   1999年

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  • この人に聞く-河本邦仁先生

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    セラミックス   34[1]51-54   1999年

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  • 導電率の向上と両立するイオン伝導性ジルコニアの強化法

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  • 強度制御可能なセラミックス複合体の設計

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    セラミックスデータブック99(工業製品技術協会)   41-43   1999年

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  • シナジティック構造制御によるイオン伝導性ジルコニアの特性向上

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    ANNUAL REPORT OF THE MURATA SCIENCE FOUNDATION   13,128-133   1999年

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▼全件表示

講演・口頭発表等

  • ミリ波を用いたセラミックスの迅速焼結

    中・四国の技術力・夢の融合〜産・学・官研究マッチング  2008年 

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    第一回粉体冶金電磁プロセス委員会講演会  2008年 

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  • Total performance of ceramics: considering both mechanical and electrical properties

    The 25th International Japan-Korea Seminar on Ceramics  2008年 

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  • 高熱伝導性AlNセラミックスのミリ波焼結

    粉体粉末冶金協会平成20年度秋季大会  2008年 

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  • 私の研究開発談

    岡山セラミックス技術振興財団、エンジニアのための課題解決トレーニング(人材育成事業)  2007年 

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  • 固相発泡法-閉気孔・閉経路の自在形成

    JST新技術説明会  2007年 

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  • Fabrication and properties of titania based foams using superplastisity

    第7回環太平洋セラミックス学会PACRIM7  2007年 

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  • セラミックス材料による高温圧力検知

    中・四国の技術力・夢の融合〜産・学・官研究マッチング  2007年 

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  • セラミックスと界面

    学力向上フロンティアハイスクール事業  2007年 

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  • セラミック材料-その多様な電磁気特性-

    日本材料学会中国支部講習会「工業材料・基礎と応用」  2006年 

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  • 超塑性発泡法による高強度高温真空断熱材

    中・四国の技術力・夢の融合〜産・学・官研究マッチング  2006年 

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  • セラミックス材料による高温圧力検知

    オムニTLO、第34回TMS研修会  2006年 

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  • セラミックスの常識

    岡山県高等学校研究会理科部会・化学教育研修会  2006年 

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  • セラミックスの微細構造制御-光や熱を透過する構造・遮断する構造-

    岡山大学COE「「高度ディジタルEMC協調統合設計」第5回シンポジウム  2006年 

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  • セラミックス固相発泡材とその製造方法

    岡山TLO、大学技術シーズ説明会  2006年 

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  • セラミックス材料による高温圧力検知

    中・四国の技術力・夢の融合〜産・学・官研究マッチング  2006年 

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  • セラミックスの電磁気特性

    日本化学会、実力養成化学講座(無機材料化学)  2006年 

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  • セラミックスの電磁気特性

    日本化学会、実力養成化学講座(無機材料化学)  2005年 

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  • 高機能セラミックス開発とその応用・例

    複合セラミックスの高機能材料への応用・例と今後の展望  2005年 

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  • セラミックスの電磁気特性

    日本化学会、実力養成化学講座(無機材料化学)  2004年 

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  • 機械特性を考慮した機能性セラミックスのトータル設計

    広島大学工学部システム化学工学科談話会  2004年 

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  • Thermal and Optical Properties of Transparent Magnesium Oxide Ceramics Fabricated by HIP Treatment

    International Symposium on Inorganic and Environmental Materials 2004  2004年 

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  • イオン伝導性ジルコニアセラミックスの不純物添加の影響

    粉体粉末冶金協会講演概要集平成16年度春季大会  2004年 

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  • Na-β-アルミナセラミックスのイオン交換による特性変化

    粉体粉末冶金協会講演概要集平成16年度春季大会  2004年 

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  • 炭化珪素系高温歪みセンサーの添加物効果

    日本セラミックス協会2004秋季大会  2004年 

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  • ニュー・セラミックスにおけるトータル・パフォーマンスの向上

    平成16年度第2回新素材交流研究会・財団法人中国技術振興センター  2004年 

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  • Collaboration of mechanical and electrical functions in ceramic materials

    The First China-Japan-Korea Symposium on Advanced Materials  2004年 

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  • 熱間静水圧加圧焼成により作製した炭化珪素セラミックスのピエゾ抵抗効果

    第41回セラミックス基礎科学討論会  2003年 

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  • チタン酸バリウムを分散材として用いた複合材料の分極処理に伴う強度変化

    電子材料討論会  2003年 

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  • EFFECT OF B, AL OR GA ON THE PIEZORESISTANCE PROPERTIES OF 6H-SIC CERAMICS SINTERED WITH CARBON

    PACRIM V Conference  2003年 

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  • セラミックスにおける機械特性と電気特性の相互協調

    第37回基礎科学部会セミナー「21世紀のセラミックス基礎科学」  2003年 

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  • イオン交換によるβ-アルミナセラミックスの強度変化

    日本セラミックス協会2003年年会  2003年 

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  • 窒素ドープしたα炭化珪素セラミックスのピエゾ抵抗効果

    粉体粉末冶金協会講演概要集平成15年度秋季大会  2003年 

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  • 誘電体セラミックスの絶縁破壊における前駆現象の研究

    第41回セラミックス基礎科学討論会  2003年 

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  • マイクロ波加熱により作製したイオン伝導性セラミックスへのアルミナ添加効果

    第14回日本MRS学術シンポジウム  2002年 

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  • 炭化珪素セラミックスの焼結助剤がピエゾ抵抗効果に及ぼす影響

    日本セラミックス協会2002年年会  2002年 

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  • 誘電体セラミックスの絶縁破壊現象と前駆電流

    日本セラミックス協会2002年年会  2002年 

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  • βアルミナセラミックスの機械特性および電気特性の調製条件依存性

    第40回セラミックス基礎科学討論会  2002年 

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  • 熱間等方圧焼結を用いた炭化珪素セラミックスの作製とピエゾ抵抗効果

    日本セラミックス協会第15回秋季シンポジウム  2002年 

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  • 表面仕上げの異なるチタニアセラミックスへの高電圧スクリーニングの効果

    第22回電子材料研究討論会  2002年 

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  • Naβアルミナセラミックスの最適配向性

    2002年度第一回賢材研究会学術技術交流会  2002年 

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  • 誘電体セラミックスの絶縁破壊における前駆現象

    日本セラミックス協会第15回秋季シンポジウム  2002年 

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  • 分散強化したイオン伝導性ジルコニアセラミックスのクリープ特性におよぼす電界の効果

    第14回日本MRS学術シンポジウム  2002年 

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  • 高濃度導電性粒子充填高分子複合体のPTC転移温度

    日本セラミックス協会2001年年会  2001年 

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  • 圧電粒子分散セラミックス複合体の亀裂進展におよぼす電界の効果

    第13回日本MRS学術シンポジウム  2001年 

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  • 炭化珪素セラミックスの高温歪みセンサーへの応用

    徳山科学技術振興財団研究成果報告会  2001年 

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  • Effect of Sintering Aids on the Piezoresistance Property of Silicon Carbide Ceramics"

    PAC RIM 4 Conference  2001年 

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  • 希土類酸化物を添加したジルコニアセラミックスの特性評価

    第13回日本MRS学術シンポジウム  2001年 

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  • 配向性βアルミナセラミックスの作製と物性

    日本セラミックス協会2001年年会  2001年 

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  • 炭化ケイ素セラミックスの作製とピエゾ抵抗効果

    第39回セラミックス基礎科学討論会  2001年 

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  • 誘電体セラミックスの絶縁破壊における前駆電流

    第39回セラミックス基礎科学討論会  2001年 

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  • 炭化珪素セラミックスの作製とピエゾ抵抗特性におよぼすアルミニウムの役割

    電子材料研究討論会  2001年 

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  • 圧電体を分散材として複合体セラミックスの電界による機械的強度の制御

    日本セラミックス協会第14回秋季シンポジウム  2001年 

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  • フィラー充填構造への高電圧印加による発光現象

    第13回平成12年度助成研究発表会  2001年 

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  • 圧電粒子分散複合セラミックスの機械的強度に及ぼす電界の効果

    第38回セラミックス基礎科学討論会  2000年 

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  • 導電性無機粒子-絶縁性有機高分子複合体のPTC効果

    第38回セラミックス基礎科学討論会  2000年 

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  • イオン伝導性ジルコニアセラミックスのクリープ特性に及ぼす電界の効果

    日本セラミックス協会2000年年会  2000年 

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  • 熱間等方圧焼結による半導性炭化珪素多結晶体の作製とその物性

    日本セラミックス協会2000年年会  2000年 

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  • チタン酸バリウム/安定化ジルコニア複合体の分極処理による機械強度変化

    第9回インテリジェント材料シンポジウム  2000年 

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  • YBa2Cu3O7-d/ZnOヘテロ接触によるNOガス検知

    第38回セラミックス基礎科学討論会  2000年 

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  • 炭化珪素セラミックスによる高温歪み検知

    平成12年度賢材研究会学術交流会  2000年 

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  • EFFECT OF HIGH VOLTAGE SCREENING METHOD ON TITANIA CERAMICS WITH DIFFERENT SURFACE FINISHING

    7th Int. Sympo. CERAMIC Materials and Components for ENGINE  2000年 

     詳細を見る

  • The effect of ambient gases on the carrier transport through the YBa2Cu3O7-d-ZnO heterocontact interface

    MASS AND CHARGE TRANSPORT IN INORGANIC MATERIALS  2000年 

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  • TiO2における前駆電流と絶縁破壊現象

    日本セラミックス協会2000年年会  2000年 

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  • 高電圧スクリーニング法の効果と強度測定法の関係

    日本セラミックス協会第13回秋季シンポジウム  2000年 

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  • Bilateral improvement of mechanical and electric functions in ceramic materials

    Japan-America Frontiers of Engineering Symposium  2000年 

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  • Strength control of a ceramic composite by electric field

    SPIE's 2000 Symposium on Smart Materials and MEMS  2000年 

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  • 導電率の向上と両立するイオン伝導性ジルコニアの強化法

    第69回電子セラミック・プロセス研究会  2000年 

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  • High-voltage screening method on variously surface finished titania ceramics

    ECS Joint Int. Meeting  1999年 

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  • 表面形態が高電圧スクリーニング効果に及ぼす影響

    第37回セラミックス基礎科学討論会  1999年 

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  • チタン酸バリウム/ジルコニア複合体の分極処理による強度変化

    日本セラミックス協会99春季年会  1999年 

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  • 損傷診断機能を有するジルコニアセラミックス

    日本セラミックス協会99春季年会  1999年 

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  • 複合薄膜におけるPTCR挙動の熱歪み速度依存性

    第8回インテリジェント材料シンポジウム  1999年 

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  • アルミナ分散イオン導電性ジルコニアセラミックスの高温保持による特性変化

    第12回日本セラミックス協会秋季年会  1999年 

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  • チタン酸バリウム/ジルコニア複合体における亀裂進展の分極処理方向依存性

    第12回日本セラミックス協会秋季年会  1999年 

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  • 高電圧による無秩序導電体ー絶縁体複合体のブレイクダウン

    第12回日本セラミックス協会秋季シンポジウム  1999年 

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  • メソ構造制御による機能性セラミックスの高機械特性の発現機構

    巨大物性セラミックスの設計と創製シンポジウム  1999年 

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  • 分散強化イオン伝導性ジルコニアセラミックスの耐熱衝撃性およびクリープ特性

    第11回日本MRS学術シンポジウム  1999年 

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  • CoOドープZnO単結晶によるホモ接合で見られる二段バリスタ特性

    第11回日本MRS学術シンポジウム  1999年 

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  • 常圧焼結炭化ケイ素のピエゾ抵抗効果

    第11回日本MRS学術シンポジウム  1999年 

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  • ダイナミック応答するPTC材料

    平成11年度賢材研究会学術交流会  1999年 

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産業財産権

  • セラミックス材料およびその製造方法

    吉田育史, 近間宇宏, 国司多通夫, 岸本昭, 野村圭輔

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    出願番号:特願2019-095457 

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  • 強誘電体炭素複合材料及びその製造方法

    寺西貴志, 岸本昭, 福井昴佑

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    出願番号:特願2017-123010 

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  • 電極及び電極の製造方法

    寺西貴志, 岸本昭, 山田博俊, 布施裕太, 平松健矢

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    出願番号:特願2019-199388 

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受賞

  • 日本セラミックス協会 フェロー表彰

    2020年6月  

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  • 粉体粉末冶金協会 研究功績賞

    2017年5月   電磁波および応力を利用したセラミックスの機能発現

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  • 日本セラミックス協会 学術賞

    2013年5月   内部・外部応力下のセラミックスの特性変化と新規調製法への応用

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    受賞国:日本国

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  • 粉体粉末冶金協会 論文賞

    2010年5月   超塑性発泡法を用いた閉気孔パターンに及ぼす調製条件の影響

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  • 日本セラミックス協会 進歩賞

    1996年5月   過酸化ポリ酸を出発原料にした機能性材料の構造と物性に関する研究

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    受賞国:日本国

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  • 日本工業新聞社日本工業新聞社賞

    1988年   ハイテク化による伝統空手の復権

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    受賞国:日本国

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共同研究・競争的資金等の研究

  • ミリ波照射を援用した迅速起動・高効率高温電気化学デバイスの構築

    研究課題/領域番号:21H01623  2021年04月 - 2025年03月

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    岸本 昭

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    配分額:17160000円 ( 直接経費:13200000円 、 間接経費:3960000円 )

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  • ミリ波照射加熱による物質移動の選択的促進と材料創製への応用

    研究課題/領域番号:16H04497  2016年04月 - 2019年03月

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    岸本 昭, 寺西 貴志, 林 秀考

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    配分額:18070000円 ( 直接経費:13900000円 、 間接経費:4170000円 )

    セリア-ジルコニア系での相互拡散はCeイオン濃度が大きいほど促進量が大きく、いずれの濃度でもミリ波照射下の方が大きな値を示した。これはセリアがジルコニアよりミリ波を吸収するため、各地点に存在するCeイオンが、その効果を受け拡散の駆動力であるエネルギーが増大したためだと考察している。チタニア-酸化スズ相互拡散で電気炉・ミリ波拡散ともチタニアのビッカース硬度は向上したが、曲げ強度はミリ波拡散のみで向上となった。置換量の少ないセリアおよびジルコニアにミリ波加熱を行うと低温焼結でき、陽イオン移動促進が示唆された。また、粒成長や曲げ変形に対しては抑制することができ、関連した陽イオン移動抑制が示唆された。

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  • 超塑性発泡法を用いた新規機能性セラミックスの創製と特性向上

    研究課題/領域番号:25289229  2013年04月 - 2016年03月

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    岸本 昭, 林 秀考, 寺西 貴志

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    配分額:18720000円 ( 直接経費:14400000円 、 間接経費:4320000円 )

    報告者の提案した超塑性発泡法を用い、セラミック中に導入した気孔の圧力による形状変化を利用したセンサの開発を行なった。 400℃までの温度範囲であればZnO発泡体は加圧・除圧における抵抗変化を示し,センサ素子としての応用が可能であることを示した。更に、異種元素(Ag,Li)のドーピングによって母体の抵抗値を変化させることで,センサ感度の向上や動作温度を500℃まで高めることに成功した。

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  • 高信頼性耐火物への制御した気孔導入が可能な超塑性発泡法の開発

    2012年04月 - 2013年03月

    キャノン財団  産業基盤の創成 

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  • 窒化物セラミックスへのミリ波照射による拡散促進と迅速焼結

    研究課題/領域番号:21017005  2009年 - 2010年

    日本学術振興会  科学研究費助成事業  特定領域研究

    岸本 昭, 林 秀考, 和久 公則

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    配分額:9800000円 ( 直接経費:9800000円 )

    ミリ波焼結を用いAlNを中心とした窒化物を焼結することのメリットは、選択加熱によるエネルギー効率の向上と非熱効果による等温下での焼結の促進であり、後者も最終的には生産性の向上をもたらす。既に報告者は、24GHzジャイロトロン管を用いたミリ波焼結により、これまでAlNで報告されている内でもっとも低い1700℃で相対密度97%以上の緻密化に成功していた。本研究の第一の目的は、ミリ波焼結とHIP焼結を組み合わせて、トータルの処理時間を短縮してこれまでと同等の高い熱伝導率の試料を得ることにある。複合焼結法では、温度、時間、雰囲気の全ての点での優位性が示された。また、一次焼結を同一条件の常圧焼結したものと比較すると、ミリ波一次焼結試料の熱伝導率は50%以上高いことがわかり、ミリ波による一次焼結が有効であることがわかった。ミリ波一次焼結1600℃の試料の添加物依存性に着目すると、密度は添加量に従って増加するが、熱伝導率は逆になっていることが興味深い。複合焼結では添加物の最適値が従来焼結、単独焼結とは異なる可能性が示された。また、ミリ波照射が拡散におよぼす影響を調べるため、イットリア安定化ジルコニアを用いミリ波照射により昇温したとき得られる導電率を、電気炉により同じ温度にしたときの値と比較した。試料と周辺の温度を同一に保った場合、500℃でミリ波照射下の導電率は通常の電気炉昇温に比べ、2.4倍の値を示した。これによりミリ波照射による拡散促進が示唆された。また、導電率が最大となる最適構造が、通常加熱とミリ波加熱では異なる結果が得られた。

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  • 超塑性発泡法によるセラミックス中への自在形状閉経路の形成

    2006年04月 - 2007年03月

    東レ科学振興会  東レ科学技術研究助成 

    岸本昭

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  • キャリア濃度の傾斜化によるイオン伝導性セラミックスのその場強化

    研究課題/領域番号:17656218  2005年 - 2006年

    日本学術振興会  科学研究費助成事業  萌芽研究

    岸本 昭, 林 秀考

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    配分額:2900000円 ( 直接経費:2900000円 )

    セラミックス材料は、高温構造材料として用いられているが、粉砕によりリサイクルしようとすると強すぎる強度が問題となる。しかし、作製時に強度を低く抑えると、供用の際信頼性が問題になる。我々は、既にジルコニアセラミックスに圧電体であるチタン酸バリウムを分散させた複合体を作製し、分極の方向にで内部応力を制御することにより強化・劣化が随意に行えることを実証したが、現時点でプラスマイナス15%程度の強度制御しか行うことができていない。
    同じ無機材料でもガラスでは、急冷やイオン交換により圧縮応力を残留させ、強度を大きくした、いわゆる強化ガラスが用いられている。融点が大きく作製時点で塑性流動の小さな多結晶材料では、急冷により亀裂が生成したり、密な構造中にイオンの出入りが困難であったりするため、これら物理的・化学的な手法での強度制御が行われていなかった。高強度セラミックスは強化ガラスの十倍以上の強度を有し、このような高い強度材、高融点の耐火物においても強度制御が望まれていた。
    本研究では、ガラスより遙かに強度が大きく、高温でも軟化しないといった特性を有していながら、内部応力が熱緩和しないような低温でイオン伝導度、イオン交換能が大きなNaβアルミナセラミックスに着目した。ガラス同様にNaイオンをイオン交換することにより、50%にも上る強度制御が達成され、最高強度が500MPaと、構造材料として十分な特性を引き出すことに成功した。またこの材料は、強度値を熱処理により容易に低減できるというリサイクル性に優れた材料であることがわかった。更に、亀裂生成についても検討し、過剰なイオン交換は生成した内部応力によるマトリックス組織の破壊を導くため強度の劣化をもたらすことを見出した。すなわち強化には最適な交換量があることがわかった。

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  • 高電圧スクリーニング法によるセラミックスの高信頼性化に関する研究

    研究課題/領域番号:11875190  1999年 - 2000年

    日本学術振興会  科学研究費助成事業  萌芽的研究

    岸本 昭, 竹田 俊二, 中村 吉伸

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    配分額:2100000円 ( 直接経費:2100000円 )

    我々は既に高電圧印加により、機械的に弱い部材を抜き取る高電圧スクリーニング法を提案し、いくつかの系で実証している。本研究では、応力分布の異なる機械強度試験(三点曲げ、四点曲げ、二軸曲げ)を用い、その機械強度と絶縁破壊強度の相関について検討し、高電圧によるスクリーニングの試験方法依存性について知見を得た。
    絶縁体試料としてチタニアセラミックスを用いた。市販粉末を一軸加圧により、直方体および円筒形に成型後、1400℃、3h焼成によりバルク試料を得た。ダイヤモンドカッターおよび手研磨により、4×12×0.3mm3およびφ=14mm,t=0.3mmの薄片試料を作製し、前者は三点曲げおよび四点曲げ試験に、後者は二軸曲げ試験に用いた。それぞれの場合について試料片を120枚作製し、半数でスクリーニング前の機械強度と絶縁強度の分布を測定し、30%の試料が絶縁破壊するスクリーニング電界を求めた。これを残りの試料に印加してスクリーニングを行い、絶縁破壊しなかった試料について機械強度分布を求め、スクリーニング前の分布と比較した。
    スクリーニング前の機械強度の平均値は三点曲げ:188MPa、四点曲げ:128MPa、二軸曲げ:77MPaとなり、有効体積が大きくなるにつれ平均強度が減少することを確認した。スクリーニング前後の四点曲げ強度分布から、スクリーニングにより、低強度側が高強度よりにシフトし、強度分布が小さくなることがわかった。応力によるスクリーニング(保証試験)の理論線と比較すると、高電圧スクリーニングの結果はスクリーニング前と応力スクリーニングの中間に位置することがわかった。応力スクリーニングとの関係を三点曲げと四点曲げで比較すると、後者に対する高電圧スクリーニングがより応力スクリーニングに近いことがわかった。これは四点曲げの最大応力範囲が三点曲げに比べて大きく、高電圧スクリーニングの電界により近いためであると思われる。

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  • 自己診断機能を有する構造材料の開発

    研究課題/領域番号:07555655  1995年 - 1996年

    日本学術振興会  科学研究費助成事業  基盤研究(A)

    岸本 昭, 柳田 博明, 戸田 郁也, 武藤 範雄, 杉田 稔, 松原 秀彰

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    配分額:3200000円 ( 直接経費:3200000円 )

    (1)CFGFRPにおける自己診断機構の広範な材料への適用
    自己診断の考え方のセラミックスへの適用は、分担者であるファインセラミックスミックスセンターおよび東大のメンバーにより行った。このうちファインセラミックスミックスセンターでは、検知材として導電性連続層を導入し、加重負荷時の電気抵抗の変化により窒化ケイ素セラミックスの破壊検知を試みた。また東大では、導電性フィラー分散プラスチック被膜をセラミックス材料上に形成し破壊前の導電性変化が顕著であることを見いだしている。自己診断の考え方の柔軟材料への適用は、分担者の一つ太陽工業により行った。CFGFRP同様の炭素繊維の抵抗片かを利用することにより、定期的に膜構造体の劣化自己診断が可能となった。
    (2)大型建造物、防犯へのCFGFRPの適用
    清水建設ではCFGFRPをコンクリート補強筋として用いた場合の、破壊自己診断性について、綜合警備保障では、壁材の補強筋として用いた場合の侵入防止に用いることを検討した。
    (3)CFGFRP自己診断機構の統計的解釈
    東京大学のグループでは、同時荷重印加時の脆性材料の機械および電気的特性の挙動から、CFGFRPの自己診断機構の統計的解釈を試みた。その結果CFGFRPの低歪み域での抵抗の漸増減少は、炭素繊維の強度分布に依存し、多数真意に同時に引っ張り試験を施した際の抵抗変化といる簡単なモデルで説明できることがわかった。

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担当授業科目

  • SDGs:化学イノベーション (2021年度) 第3学期  - 木7~8

  • セラミックス化学 (2021年度) 後期  - 木1,木2

  • セラミックス材料 (2021年度) 前期  - その他

  • 化学基礎 (2021年度) 第2学期  - 火3,火4,金1,金2

  • 化学基礎 (2021年度) 第2学期  - 火3~4,金1~2

  • 化学基礎 (2021年度) 第2学期  - 火3,火4,金1,金2

  • 化学生命系概論 (2021年度) 特別  - その他

  • 化学生命系概論 (2021年度) 特別  - その他

  • 実践応用化学 (2021年度) 前期  - その他

  • 応用化学ゼミナール1 (2021年度) 前期  - その他

  • 応用化学ゼミナール2 (2021年度) 後期  - その他

  • 応用化学基礎 (2021年度) 後期  - 月3~4,火3~4

  • 応用化学特別研究 (2021年度) 通年  - その他

  • 数理・データサイエンス(発展) (2021年度) 第4学期  - 火1,火2

  • 無機化学及び演習1 (2021年度) 第1学期  - 月1,月2,木1,木2

  • 無機化学1 (2021年度) 第1学期  - 月1,月2,木1,木2

  • 無機化学1 (2021年度) 3・4学期  - 水3,水4

  • 無機化学3 (2021年度) 第3学期  - 火1,火2,金1,金2

  • 無機化学4 (2021年度) 第3学期  - 火1,火2,金1,金2

  • 無機物性化学 (2021年度) 第4学期  - 月1,月2

  • 無機物性化学 (2021年度) 第4学期  - 月1,月2

  • 無機物性化学演習 (2021年度) 通年  - その他

  • 確率統計2 (2021年度) 第4学期  - 火1,火2

  • セラミックス化学 (2020年度) 後期  - 木1,木2

  • セラミックス材料 (2020年度) 前期  - その他

  • 化学基礎 (2020年度) 第2学期  - 水1,水2,金1,金2

  • 化学基礎 (2020年度) 第2学期  - 水1,水2,金1,金2

  • 化学生命系概論 (2020年度) 夏季集中  - その他

  • 化学生命系概論 (2020年度) 夏季集中  - その他

  • 実践応用化学 (2020年度) 前期  - その他

  • 応用化学ゼミナール1 (2020年度) 前期  - その他

  • 応用化学ゼミナール2 (2020年度) 後期  - その他

  • 応用化学基礎 (2020年度) 後期  - 月3~4,火3~4

  • 応用化学特別研究 (2020年度) 通年  - その他

  • 材料プロセス各論1 (2020年度) 夏季集中  - その他

  • 材料プロセス各論1 (2020年度) 夏季集中  - その他

  • 材料機能化学特論5 (2020年度) 夏季集中  - その他

  • 無機化学及び演習1 (2020年度) 第1学期  - 月1,月2,木1,木2

  • 無機化学1 (2020年度) 第1学期  - 月1,月2,木1,木2

  • 無機化学3 (2020年度) 第3学期  - 火1,火2,金1,金2

  • 無機化学4 (2020年度) 第3学期  - 火1,火2,金1,金2

  • 無機物性化学 (2020年度) 第4学期  - 月1,月2

  • 無機物性化学 (2020年度) 第4学期  - 月1,月2

  • 無機物性化学演習 (2020年度) 通年  - その他

  • 現代化学1 (2020年度) 第3学期  - 月3,月4

▼全件表示