2024/02/07 更新

写真a

テラニシ タカシ
寺西 貴志
TERANISI Takasi
所属
環境生命自然科学学域 准教授
職名
准教授
外部リンク

学位

  • 博士(工学) ( 2010年9月   東京工業大学 )

  • 修士(工学) ( 2006年3月   東京工業大学 )

  • 学士(工学) ( 2004年3月   東京工業大学 )

研究キーワード

  • 強誘電体

  • ミリ波焼成プロセス

  • リチウムイオン電池

研究分野

  • ナノテク・材料 / 応用物性

  • ナノテク・材料 / 結晶工学

  • ナノテク・材料 / 無機材料、物性

学歴

  • 東京工業大学   Science of Engineering  

    - 2010年

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    国名: 日本国

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  • 東京工業大学   School of Engineering   DEAPRTMENT OF INORGANIC MATERIALS

    - 2004年

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    国名: 日本国

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経歴

  • 岡山大学 大学院自然科学学域   准教授

    2018年4月 - 現在

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委員歴

  • 日本セラミックス協会   セッションオーガナイザー  

    2018年4月 - 現在   

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  • 日本セラミックス協会   中四国支部運営委員  

    2013年 - 現在   

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論文

  • 外場としてのミリ波を援用した高温電気化学デバイスの特性変化

    Takuro FUJIWARA, Takashi TERANISHI, Akira KISHIMOTO, Seiichi SUDA

    Journal of the Japan Society of Powder and Powder Metallurgy   70 ( 9 )   387 - 391   2023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:Japan Society of Powder and Powder Metallurgy  

    DOI: 10.2497/jjspm.23-00013

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  • 負膨張材料を分散させた表面層を持つセラミックス積層体の耐熱衝撃性

    Takaya UENO, Shinya KONDO, Takashi TERANISHI, Akira KISHIMOTO

    Journal of the Japan Society of Powder and Powder Metallurgy   70 ( 8 )   376 - 379   2023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:Japan Society of Powder and Powder Metallurgy  

    DOI: 10.2497/jjspm.23-00011

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  • Polarization contributions to DC bias characteristics of nanograined BaTiO3-based ceramics

    Takashi Teranishi, Ruku Ozaki, Shinya Kondo, Akira Kishimoto

    Japanese Journal of Applied Physics   62 ( SM )   SM1015 - SM1015   2023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:IOP Publishing  

    Abstract

    The domain configuration contributions to the DC bias characteristics of nanograined BaTiO3 were clarified. Domain boundaries became more ambiguous with decreasing grain size (g.s.), whereas domain patterns partially vanished because of the reduction in BT ferroelectricity, in the g.s. range <1 μm. Additionally, intergranular stress increased with decreasing g.s., resulting in crystal lattice hardening in the vicinity of the domain walls (DWs) and suppression of dipole fluctuations in the DWs. These domain structural variations with the domain size (d.s.) reduced permittivity in the absence of a DC electric field, resulting in improvements in permittivity depressions in an electric field (Δε). Magnesium substitution slightly decreased the d.s. The increase in DW density upon Mg loading implied defect pairs, ${ { \rm{Mg } } }_{ { \rm{Ti } } }^{"}$–${ { \rm{V } } }_{ { \rm{o } } }^{\bullet \bullet },$ which acted as new DW pinning centers, thereby subdividing the DWs. The Δε notably improved via Mg loading, because a defect pair effectively pins the DWs under the electric field.

    DOI: 10.35848/1347-4065/ace6a8

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    その他リンク: https://iopscience.iop.org/article/10.35848/1347-4065/ace6a8/pdf

  • Spinodal decomposition-derived giant polarization in TiO2–SnO2 generated from a metastable phase 査読

    Takashi Teranishi, Hideki Matsui, Shinya Kondo, Akira Kishimoto

    Journal of Applied Physics   133 ( 17 )   2023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:{AIP} Publishing  

    <jats:p>Spinodal decomposition (SD) was incorporated into Nb-doped metastable TiO2–SnO2 to achieve giant interfacial polarization. The dielectric characteristics were analyzed using an equivalent circuit involving electron migration, where the SD bulk is given by the universal dielectric response relation. Both the Nb–TiO2 and the Nb–SnO2 layers showed semiconductive behaviors. With increasing SD treatment temperature, the SD volume fraction increased, as did cation interdiffusion at the SD interface, resulting in a large dielectric loss. The optimal SD temperature was determined as 1100 °C, where the Maxwell–Wagner capacitance showed a very high value of 44.6 μF corresponding to the permittivity at the lowest frequency exceeding 106. Such colossal polarization was considered due to an accumulation of trapped electrons at the Schottky barrier at SD layers with different conductivities.</jats:p>

    DOI: 10.1063/5.0144782

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  • Direct measurement of electrocaloric effect based on multi-harmonic lock-in thermography

    Ryo Iguchi, Daisuke Fukuda, Jun Kano, Takashi Teranishi, Ken-ichi Uchida

    Applied Physics Letters   122 ( 8 )   2023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:AIP Publishing  

    We report on a direct measurement method for electrocaloric effects, the heating/cooling upon application/removal of an electric field in dielectric materials, based on a lock-in thermography technique. By use of sinusoidal excitation and multi-harmonic detection, the actual temperature change can be measured by a single measurement in the frequency domain even when the electrocaloric effect shows a nonlinear response to the excitation field. We demonstrated the method by measuring the temperature dependence of the electric-field-induced temperature change in two Sr-doped BaTiO3 systems with different ferroelectric-paraelectric phase transition temperatures, where we introduce the procedure for extracting the pure electrocaloric contribution free from heat losses and Joule heating due to leakage currents. This method can be used irrespective of the type of dielectric material and enables simultaneous estimation of the polarization change and power dissipation during the application of an electric field, making it a convenient imaging measurement method for the electrocaloric effect.

    DOI: 10.1063/5.0137686

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  • Density Functional Theory and Machine Learning-Based Analyses for Improved Surface Stability of a BaTiO3-Coated LiCoO2 Positive Electrode Material

    Kunihiro Ishida, Naoto Tanibata, Hayami Takeda, Masanobu Nakayama, Takashi Teranishi, Naoki Watanabe

    PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS   259 ( 9 )   2022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:WILEY-V C H VERLAG GMBH  

    The application of oxide coating on the surfaces of active cathode materials is an effective method for improving the electrochemical durability of lithium-ion batteries because it suppresses oxygen gas release from the surface of the cathode material. This report summarizes a study conducted on verifying the suppression of oxygen release from a LiCoO2 cathode material using BaTiO3 (BT), which has recently attracted attention as a new coating material. The use of first-principles calculations and machine learning as verification methods is described. In addition to the discussion of interfacial properties based on atomic- and electronic-level considerations, comprehensive verification of the interface with several junction patterns is described. The verification results suggest that the desorption of oxygen from the surface of the active material is hindered by the oxide coating, indicating the effectiveness of BT as a coating material.

    DOI: 10.1002/pssb.202100526

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  • Electric Potential Mapping of All-Solid-State Lithium Ion Batteries using A Terahertz Chemical Microscope

    Ryota Tomie, Taketo Yamaguchi, Masashi Shimizu, Kashu Hamada, Takashi Teranishi, Hidetoshi Nose, Masaki Kobayashi, Jin Wang, Kenji Sakai, Toshihiko Kiwa

    2022 47TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER AND TERAHERTZ WAVES (IRMMW-THZ 2022)   2022年8月

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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:IEEE  

    A terahertz (THz) chemical microscope has been developed to measure the electric potential distribution of liquid phase lithium ion batteries (LIBs) during charging and discharging. A LIB was fabricated on a sensing plate, which consists of SiO2 and Si films on a sapphire substrate, to generate THz pulses by a laser irradiation. Since the amplitude of THz is proportional to the electric potential on the sensing plate, the electric potential distribution of the lithium ion battery on the sensing plate could be visualized. In this study, the electric potential distribution across a conventional all-solid-state LIB was measured by immobilizing the LIB on the sensing plate using epoxy resin. The distribution of the electric potentials of the battery was clearly visualized by the TCM. This result indicates that the TCM could be one of useful tools for the development high performance batteries.

    DOI: 10.1109/IRMMW-THz50927.2022.9896121

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  • Ceria-based solid electrolyte exhibits superior mechanical and electric properties compared to zirconia-based solid electrolyte

    Akira Kishimoto, Taiga Umemura, Shinya Kondo, Takashi Teranishi

    CERAMICS INTERNATIONAL   48 ( 15 )   21824 - 21831   2022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:ELSEVIER SCI LTD  

    The mechanical strength and electrical characteristics of 10 mol% gadolinium (Gd)-doped ceria (10GDC) and gadolinium-samarium (Gd-Sm) co-doped ceria ceramics treated by contact reduction were investigated. The observed increased strength of 10GDC was similar to the strength previously reported for ceria with and without Sm doping. X-ray photoelectron spectroscopy revealed that only the surface was reduced in the strengthened material. In addition, the strengthened ceramic displayed improved hardness at low test loads, which suggested the formation of a surface compression layer. The reducing conditions did not affect the electrical conductivity of the 10GDC material. Co-doping with 10 mol% each of Gd and Sm improved strength and conductivity compared with 10GDC and 20GDC. When the co-doped material was reduced, the electric conductivity remained identical; however, the mechanical strength improved, exceeding the strength of zirconia.

    DOI: 10.1016/j.ceramint.2022.04.166

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  • Case report of a Japanese patient with chronic renal failure who developed SARS-CoV-2 in a hospital cluster during treatment for acute respiratory failure: An autopsy report

    Yoshifumi Amari, Satoshi Morimoto, Takashi Teranishi, Mai Ohata, Atsushi Takeshita, Hiroshi Hirano, Hitoshi Kobayashi

    CLINICAL CASE REPORTS   10 ( 7 )   2022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:WILEY  

    This article reports a clinical and histopathological perspective which noted not only COVID-19 pneumonia but also exacerbation of chronic renal failure potentially caused by thrombus in the kidney, possibly COVID-19-related lesions. The accumulation of autopsy cases will elucidate the pathogenesis of COVID-19 and aid in the development of effective therapeutics.

    DOI: 10.1002/ccr3.6024

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  • Capacity retention improvement of LiCoO2 cathodes via their laser-ablation-based nanodecoration by BaTiO3 nanoparticles

    Takashi Teranishi, Yumi Yoshikawa, Joel Leblanc-Lavoie, Nazar Delegan, Ibrahima Ka, Akira Kishimoto, My Ali El Khakani

    JOURNAL OF APPLIED PHYSICS   131 ( 12 )   124105 - 124105   2022年3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:AIP Publishing  

    We report on the pulsed-laser-deposition (PLD) based nanodecoration of LiCoO2 (LCO) with BaTiO3 (BTO) nanoparticles (NPs) aimed at increasing the density of dielectric-active material–electrolyte triple-phase interfaces (TPIs). The BTO-NPs were deposited onto LCO at different numbers of laser pulses (NLp) and two different schemes, namely, (i) BTO-NP deposition on the surface of the precast cathode (“2D-nanodecoration”) and (ii) BTO-NP decoration of LCO powder prior to its processing to form a working cathode (“3D-nanodecoration”). While the “2D-nanodecoration” mode was found to improve significantly the discharge capacity of the LCO cathodes (by ∼30 mAh/g for NLp ≥ 200), their capacity retention (CR) was modest. In contrast, the “3D-nanodecoration” scheme enabled not only the volumic nanodecoration of the LCO powder by BTO-NPs but also their subsequent annealing to improve their crystallinity. These 3D-nanodecorated LCO cathodes were found to exhibit significantly higher CR values. In particular, for NLp = 100 k, a CR (@10 °C) as high as 78% was achieved (∼47% higher than that of their sol–gel-processed cathode counterparts). Our results point out that three key ingredients (small BTO-NP size, high DTPI, and high dispersibility of NPs on LCO) should be combined to ensure a high CR of BTO-NP-decorated LCO cathodes.

    DOI: 10.1063/5.0075970

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

    Akira Kishimoto, Kentaro Tanaka, Takashi Teranishi

    JOURNAL OF POROUS MATERIALS   29 ( 1 )   153 - 159   2022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:SPRINGER  

    The applicability of rice husks to solid phase foaming ceramics was assessed. Through an atmospheric heat treatment on silicon carbide based mixture produced by the reduction heat treatment of rice husks, the residual carbon was mostly eliminated, giving a foaming agent composed of approximately SiC and SiO2. Solid-phase foamed porous ceramics was fabricated using this rice husk-derived foaming agent and the properties were compared with that fabricated from commercially available SiC. The sample fabricated from the rice husk-derived foaming agent showed favorable performances in terms of both strength and heat insulating properties. In comparison with the sample fabricated by adding commercially available silica in addition to commercial SiC, the strength became comparable, however, its heat insulating property was still inferior to that using rice husk-derived foaming agent. The increase in mechanical strength can be ascribed to the suppression of the grain growth due to the added silica. The formed silica phase existing at the grain boundaries would affect the thermal conductivity.

    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

  • Ultrafast Ion Transport via Dielectric Nanocube Interface

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

    ADVANCED MATERIALS INTERFACES   9 ( 4 )   2022年2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  

    Drastic enhancement in the high-rate capability of lithium-ion batteries to the level of supercapacitors while maintaining high energy density is required for next-generation power sources. Incorporating dielectric BaTiO3 (BTO)-based nanocubes (NCs) into the active materials-electrolyte interface provides an ultrafast charge transfer pathway via the dielectric layer. The highly dispersed NC-decorated LiCoO2 (LCO) treated at the optimized temperature of 600 degrees C displays significantly enhanced high-rate capability; the cell maintains 56.7 mAh g(-1) at 50C (1C = 160 mA g(-1)), which compares with null capacity at the same rate for bare LCO. Comparing the NCs with conventional sol-gel-derived nanoparticles, the capacity retention at 10C (vs 0.1C) steadily increases with increasing active materials-dielectric-electrolyte triple-phase interface (TPI) in the NC-decorated case, whereas the capacity retention decreases markedly at similar TPI density in the sol-gel case. In the sol-gel case, the amount of Li ions accumulating at the TPI greatly exceeds the maximum amount of Li ions involved in electron exchange through the redox reaction within the charge/discharge time. In the NC case, most Li ions at the TPI participate effectively in the redox reaction, which results in fast charge transfer since the TPI sites are abundantly supplied with Li ions.

    DOI: 10.1002/admi.202101682

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  • Development of impedance measurement of lithium ion batteries electrode using terahertz chemical microscope

    Masashi Shimizu, Ryoji Yamanaka, Takashi Teranishi, Jin Wang, Kenji Sakai, Keiji Tsukada, Toshihiko Kiwa

    ELECTRICAL ENGINEERING IN JAPAN   214 ( 4 )   2021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  

    In recent years, with the spread of electric vehicles, improvement in the performance of lithium ion batteries has been required. Evaluation of the active material is important because the performance of the lithium ion battery is affected by the movement of lithium ions at the electrode active material-electrolyte interface. In this study, we fabricated a lithium ion battery with the sensing plate, which is a potential sensor, attached to the positive electrode, and evaluated lithium ion battery with a terahertz chemical microscope (TCM). As a result, we succeeded in measuring the potential distribution of the positive electrode during charging and discharging, and the local impedance.

    DOI: 10.1002/eej.23355

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    その他リンク: https://onlinelibrary.wiley.com/doi/full-xml/10.1002/eej.23355

  • A surface-supporting method for an anode material of Li4Ti5O12 via an epitaxial thin film approach

    Sou Yasuhara, Shintaro Yasui, Takashi Teranishi, Takuya Hoshina, Takaaki Tsurumi, Mitsuru Itoh

    JAPANESE JOURNAL OF APPLIED PHYSICS   60 ( SF )   2021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:IOP PUBLISHING LTD  

    High-speed rechargeability is essential for next-generation secondary batteries. Introducing a surface-supporting material deposited on a cathode material accelerates Li-ion motions between an electrode-electrolyte interface by an electric field concentration at a supporting material-cathode-electrolyte (triple-phase) interface (TPI). In addition, a high relative permittivity material was found to be a promising supporting material with which to reinforce the electric field concentration at TPIs. However, the TPI's effects on anode materials remains to be revealed. To demonstrate those effects, we prepared CeO2 or BaTiO3 micropads deposited on Li4Ti5O12 epitaxial thin films. Compared with the cathodes, CeO2 micropads deposited on Li4Ti5O12 film showed the best performance at a high C-rate. Because the rate-determining step of Li4Ti5O12 epitaxial thin films is inner diffusion, reinforcing the surface electric field by the deposition of a low relative permittivity materials could promote high C-rate performance even in anode materials.

    DOI: 10.35848/1347-4065/ac15a8

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

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

    JAPANESE JOURNAL OF APPLIED PHYSICS   60 ( SF )   2021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:IOP PUBLISHING LTD  

    Recently, we reported linear electro-optic (EO) effects in (100)-epitaxial yttrium-doped hafnium dioxide (Y-HfO2) ferroelectric thin films. In this study, we have investigated the influence of orientation on the EO effect in Y-HfO2 thin-film. (111)-epitaxial undoped HfO2 and Y-HfO2 films were deposited on Sn-doped In2O3/yttria-stabilized zirconia (111) substrates at room temperature through radiofrequency magnetron sputtering. Although the undoped HfO2 film showed typical paraelectric characteristics, ferroelectricity was observed in the (111)-Y-HfO2 film. Remnant polarization in the (111)-Y-HfO2 film was higher than that in the (100)-Y-HfO2 film. The (111)-Y-HfO2 film exhibited a linear EO effect based on ferroelectricity, which is consistent with that of the (100)-Y-HfO2 film. The average EO coefficient r (c) of the (111)-Y-HfO2 film was 0.67 pm V-1, which is higher than that of the (100)-Y-HfO2 film. This result is reasonable considering the difference in remnant polarization between the (100)-Y-HfO2 and (111)-Y-HfO2 films.

    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

  • Revealing intrinsic electro-optic effect in single domain Pb(Zr, Ti)O-3 thin films

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

    We deposited polar-axis-oriented tetragonal and rhombohedral single domain Pb(Zr, Ti)O-3 (PZT) films on CaF2(100) substrates by inserting SrRuO3 (SRO)/LaNiO3 and SRO/SrTiO3/TiO2/CeO2 buffer layers. Both PZT films grew epitaxially and had a (001)- and (111)-domain with the remnant polarization and piezoelectric constant comparable to the theoretical values of PZT single crystals having the same compositions. The electro-optic (EO) response of the fabricated PZT films was constant with respect to the DC electric field and increased linearly with an increasing AC electric field, thus representing a typical linear EO response in single domain ferroelectrics. The measured EO coefficients were larger than the value for a single crystal of PbTiO3, i.e., one of the end members of PZT, but smaller than the values reported for polycrystalline and epitaxial PZT films with multiple domains. These findings show that the intrinsic EO effect is enhanced in PZT, which is similar to the enhancement seen in the dielectric and piezoelectric constants. Moreover, most of the reported EO response in PZT films is supported by additional extrinsic contributions.

    DOI: 10.1063/5.0056121

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

    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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    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  

    <title>Abstract</title>
    Electro-optic (EO) modulators for silicon photonics using CMOS-compatible materials and processes are in great demand. In this study, epitaxial (100)-undoped HfO2 and Y-doped HfO2 thin films were fabricated on Sn-doped In2O3/yttria-stabilized zirconia(100) substrates at room temperature via magnetron sputtering. EO measurement of the Y-HfO2 film using modulation ellipsometry showed that the phase was changed by 180° after application of positive and negative poling biases, and the modulation amplitude increased linearly with increasing AC electric field, indicating a linear EO effect based on ferroelectricity. The observed results indicate that ferroelectric HfO2-based films are viable candidates for CMOS-compatible EO devices.

    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

  • Suppression Mechanisms of the Solid-Electrolyte Interface Formation at the Triple-Phase Interfaces in Thin-Film Li-Ion Batteries

    Sou Yasuhara, Shintaro Yasui, Takashi Teranishi, Osami Sakata, Takuya Hoshina, Takaaki Tsurumi, Yutaka Majima, Mitsuru Itoh

    ACS APPLIED MATERIALS & INTERFACES   13 ( 29 )   34027 - 34032   2021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 CHEMICAL SOC  

    Side reactions of the charge/discharge in Li-ion batteries (LIBs) generate a solid-electrolyte interface (SEI) onto an electrode surface, resulting in the degradation of the lifetime of a cell. The suppression of SEI formations has attracted much attention for achieving longer cyclable LIBs. Our research group has previously reported that few SEI were observed at triple-phase interfaces (TPIs) consisting of BaTiO3, LiCoO2, and electrolyte interfaces in LIBs with excellent cyclability and ultrahigh-speed chargeability. An investigation on the suppression mechanisms of SEI formations at TPIs should yield important information on understanding the undesirable side reactions. Therefore, we have explored the suppression mechanisms of SEI formations by preparing epitaxial thin films and evaluating the surface of the samples after the electrochemical treatment. The results of X-ray photoelectron spectroscopy and scanning electron microscopy with energy-dispersive X-ray analysis measurements suggested that the decomposition of LiPF6 was suppressed at TPIs, implying that the generation of PF5 via the decomposition of LiPF6 contributed to SEI formation.

    DOI: 10.1021/acsami.1c05090

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  • Surface-supporting method of micropad deposition onto LiCoO2 epitaxial thin films to improve high C-rate performance

    Sou Yasuhara, Shintaro Yasui, Takashi Teranishi, Takuya Hoshina, Takaaki Tsurumi, Mitsuru Itoh

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   129 ( 7 )   415 - 418   2021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:CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

    High-speed rechargeable Li ion batteries are in strong demand. Two methods have been reported to improve the high-speed rechargeability of electrodes: reducing particle size and introducing a surface support. However, the effectiveness of the latter could not be directly compared among reports due particle size differences from study to study. Our previous report revealed that Li+ motion under high-speed charge-discharge conditions is accelerated around a surface-supporting material, an electrode, and an electrolyte interface. In this study, we prepared epitaxial LiCoO2 thin films with micropads of various kinds of materials and evaluated the high-speed rechargeability of each. (C) 2021 The Ceramic Society of Japan. All rights reserved.

    DOI: 10.2109/jcersj2.20237

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

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

    JOURNAL OF POWER SOURCES   494   2021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  

    We report ultrafast charge transfer along the Li-ion pathway via a dielectric layer at the electrolyte electrode interface. The rate capabilities of dielectric-modified cathodes were evaluated as a function of the combination of electrolyte solvents and dielectric layers having various dielectric constants, epsilon(r). The high-rate capability was enhanced when the loaded dielectric layer's epsilon(r) was close to that of the electrolyte solvent. Density functional theory molecular dynamics calculations and atomic force microscope force measurements confirmed that the activation energies related to Li+ adsorption and desolvation were notably reduced when the loaded dielectric layer's epsilon(r) approached that of the solvent. In this case, the solvated Li+ ion preferentially underwent desolvation on the solid surface. The discharge capacity at the ultrahigh rate of 50 C (1 C = 160 mA g(-1)) of the dielectric-modified thin films steadily increased with increasing length of the dielectrics electrode electrolyte triple-phase interface (TPI). Experimental and computational results reveal that, when the permittivity of the dielectrics and solvent are similar, solvated Li+ ions are preferentially involved in the physical adsorption and desolvation on the dielectric surface, followed by Li+ intercalation near the TPI.

    DOI: 10.1016/j.jpowsour.2021.229710

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

    Takashi Teranishi, Yuki Nishikori, Mika Yoneda, Akira Kishimoto

    JAPANESE JOURNAL OF APPLIED PHYSICS   60 ( 4 )   2021年4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:IOP PUBLISHING LTD  

    A novel colossal polarization architecture generated at the fast Li-ion conductor-dielectric interface is proposed. A fast Li-ion conductor, La0.57Li0.29TiO3 (LLT), is utilized as the conductive core material, while the ferroelectric barium titanate (BaTiO3; BT) was coated onto the LLT as the shell layer via a liquid phase reaction. After densification of the composites, the shell BT fully transforms into the interdiffusion layer, i.e. (Ba, Li, La)TiO3 (BLLT). The BLLT effectively hinders Li diffusion, leading to a colossal polarization at the core-shell interface. Consequently, the optimized BT-LLT achieves dielectric characteristics at 1 kHz with permittivity of 3.28 x 10(4).

    DOI: 10.35848/1347-4065/abf088

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  • Investigation of Cross-Section Measurement Method for All-Solid-State Batteries Using Terahertz Chemical Microscopy

    Masashi Shimizu, Ryota Tomie, Kashu Hamada, Takashi Teranishi, Jin Wang, Kenji Sakai, Toshihiko Kiwa

    2021 46TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER AND TERAHERTZ WAVES (IRMMW-THZ)   2021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:IEEE  

    In recent years, all-solid-state batteries have been attracting attention as secondary batteries to replace Li ion batteries. To improve the performance of all-solid-state batteries, measurement methods are required to evaluate electrode-solid electrolyte interfaces and electrochemical reactions between electrodes. In this study, we investigated a measurement method for the cross-section of all-solid-state batteries using terahertz chemical microscopy (TCM). We fabricated a model of all-solid-state battery and showed the possibility of using TCM to measure the cross-section of the all-solid-state battery by measuring the cross-section of a model of all-solid-state battery.

    DOI: 10.1109/IRMMW-THz50926.2021.9567015

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  • Electric Potential Distribution on Lithium Ion Battery Cathodes Measured Using Terahertz Chemical Microscopy 査読

    Toshihiko Kiwa, Yuki Akiwa, Hayato Fujita, Takashi Teranishi, Kenji Sakai, Hidetoshi Nose, Masaki Kobayashi, Keiji Tsukada

    JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES   41 ( 4 )   430 - 437   2020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:SPRINGER  

    A terahertz chemical microscope has been developed to visualize electric potential distribution on lithium ion battery cathodes during battery operation. A sensing plate comprising a Si film grown epitaxially on a sapphire substrate was used as a terahertz emitter. The amplitude of terahertz radiation from the sensing plate could be related to the electric potential at the exact point where a femtosecond laser illuminated. Here, the sensing plate was integrated into a conventional can-type lithium ion battery and terahertz radiation from the sensing plate was observed during battery operation between 2.7 and 4.2 V. By scanning the laser, the distribution of terahertz amplitude radiated from the sensing plate was observed, which could be related to the electric potential distribution on the electrodes of the batteries. Localized electric potential could be visualized as the amplitude of terahertz radiation generated in the sensing plate, which was integrated beneath the battery electrode.

    DOI: 10.1007/s10762-019-00640-x

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

    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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    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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  • High-frequency dielectric characterization of electronic defect states in co-sputtered W-doped TiO2

    N. Delegan, T. Teranishi, M. A. El Khakani

    Journal of Applied Physics   125 ( 20 )   205103 - 205103   2019年5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: 10.1063/1.5087061

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  • Enhancement of Ultrahigh Rate Chargeability by Interfacial Nanodot BaTiO3 Treatment on LiCoO2 Cathode Thin Film Batteries

    Sou Yasuhara, Shintaro Yasui, Takashi Teranishi, Keisuke Chajima, Yumi Yoshikawa, Yutaka Majima, Tomoyasu Taniyama, Mitsuru Itoh

    Nano Letters   19 ( 3 )   1688 - 1694   2019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:American Chemical Society (ACS)  

    DOI: 10.1021/acs.nanolett.8b04690

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

    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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    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

    T. Teranishi, Y. Yoshikawa, M. Yoneda, A. Kishimoto, J. Halpin, S. O’Brien, M. Modreanu, I. M. Povey

    ACS Appl. Energy Mater.   1   3277 - 3282   2018年6月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Low-temperature High-rate Capabilities of Lithium Batteries via Polarization-assisted Ion Pathways 査読

    T. Teranishi, N. Katsuji, K. Chajima, S. Yasuhara, M. Inohara, Y. Yoshikawa, S. Yasui, H. Hayashi, A. Kishimoto, M. Itoh

    Advanced Electronic Materials   4   1700413   2018年3月

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    担当区分:筆頭著者   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 Ba0.8Sr0.2TiO3 査読

    T. Teranishi, K. Osaki, H. Hayashi, A. Kishimoto

    J. Am. Ceram. Soc.   101 ( 2 )   723 - 731   2018年2月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1111/jace.15242

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  • Millimeter-wave irradiation heating for operation of doped CeO2 electrolyte-supported single solid oxide fuel cell 査読

    Salmie S. C. Abdullah, T. Teranishi, H. Hayashi and A. 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)  

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  • Synthesis of nano-crystalline LiNbO3-decorated LiCoO2 and resulting highrate capabilities", Solid State Ionics 査読

    T. Teranishi, M. Inohara, J. Kano, H. Hayashi, A. Kishimoto, K. Yoda, H. Motobayashi, Y. Tasaki

    Solid State Ionics   314   57 - 60   2018年1月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • 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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  • LaGaO<sub>3</sub>系セラミックスにおける酸化物イオン伝導に及ぼすミリ波照射加熱の影響 査読

    工藤侑芽、藤井祐里、蓮沼英樹、寺西貴志、林秀考、岸本昭

    粉体および粉末冶金   65 ( 1 )   21 - 25   2018年

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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.65.21

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  • Evaluation of Li-ion battery using a Terahertz Chemical Microscope

    Yuki Akiwa, Kentarou Fujiwara, Yumi Yoshikawa, Takashi Teranishi, Kenji Sakai, Toshihiko Kiwa, Keiji Tsukada

    2018 43RD INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ)   2018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:IEEE  

    We measured the terahertz wave intensity of the active material surface using TCM as a method to evaluate lithium ion batteries. We made a battery with a sensing plate attached to measure with TCM. As a result, changes in the terahertz wave intensity due to charging and discharging of the battery could be measured. This result indicates that the extraction and insertion of lithium in the active material can be measured by TCM in the future.

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

    KISHIMOTO Akira, SHIMOYAMA Koyo, TERANISHI Takashi, HAYASHI Hidetaka

    Journal of the Ceramic Society of Japan   125 ( 10 )   717 - 720   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:公益社団法人 日本セラミックス協会  

    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.

    DOI: 10.2109/jcersj2.17056

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

    Yoshikawa Yumi, Teranishi Takashi, Hayashi Hidetaka, Kishimoto Akira

    Jpn. J. Appl. Phys.   56 ( 10 )   10PC01 - 4959   2017年9月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Physics  

    Cyclic characteristics of BaTiO<inf>3</inf>(BT)-decorated LiCoO<inf>2</inf>(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 Al<inf>2</inf>O<inf>3</inf>(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 Al<inf>2</inf>O<inf>3</inf>–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 4.7 V. 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.

    DOI: 10.7567/JJAP.56.10PC01

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  • Broadband spectroscopy of dielectrics and oxygen-ion conductors 査読

    Takashi Teranishi *

    Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan, Yogyo Kyokai Shi/Journal of the Ceramic Society of Japan, Journal of the Ceramic Society of Japan   125 ( 7 )   547 - 551   2017年7月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.2109/jcersj2.17083

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  • Electrodeposition of Ni-Al(OH)3 Composite Films from NO3 Containing Non-Suspended Bath

    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)  

    DOI: 10.1111/jace.14768

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  • Effect of the (Ba + 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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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    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 and Design, International Journal of Materials in Engineering Applications   115   231 - 237   2017年2月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.matdes.2016.11.051

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  • 固相発泡により扁平気孔を導入した高温圧力センサーの特性向上 (特集 粉末冶金プロセスによる製造技術とその材料評価の新展開) 査読

    高室 佑基, 寺西 貴志, 林 秀考, 岸本 昭

    粉体および粉末冶金 = Journal of the Japan Society of Powder and Powder Metallurgy : 紛体粉末冶金協会誌   64 ( 2 )   68 - 72   2017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)   出版者・発行元:粉体粉末冶金協会  

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

    A. Kishimoto, A. Tohji, T. Teranishi and H. Hayashi

    Ceram. Trans   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)  

    DOI: 10.1063/1.4964803

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  • Quantitative study of band structure in BaTiO3 particles with vacant ionic sites 査読

    Norihiro Oshime,Jun Kano*,Naoshi Ikeda*,Takashi Teranishi*,Tatsuo Fujii*,Takeji Ueda,Tomoko Ohkubo

    Journal of Applied Physics   120 ( 15 )   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)  

    DOI: 10.1063/1.4964803

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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, Part 1: Regular Papers & Short Notes, Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Japanese Journal of Applied Physics, Japanese Journal of Applied Physics, Part 2: Letters   55 ( 10 )   2016年10月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.7567/JJAP.55.10TB01

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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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  • 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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  • Electrical Conductivity of Ceria-based Oxide under 24 GHz Millimeter-wave Heating in Varying Thermal Environments 査読

    CHE ABDULLAH Salmie Suhana Binti, TERANISHI Takashi, HAYASHI Hidetaka, KISHIMOTO Akira

    粉体および粉末冶金   63 ( 7 )   663 - 667   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:一般社団法人 粉体粉末冶金協会  

    <p>Sm-doped CeO2 ceramics were prepared by conventional solid state method. The electrical conductivity of the samples was measured under conventional heating and 24 GHz millimeter-wave (MMW) heating, and the results were compared. During MMW heating, 5 mol% Sm-doped CeO2 pellets with different thickness were used as susceptors, meanwhile Al2O3 fiber board was used as thermal insulator and its design varies by the number of open channels. The aforementioned susceptors and thermal insulators dependency of conductivity values during MMW heating were studied. Conductivity of samples under MMW heating was found to be higher than under conventional heating. Results showed that the different susceptor thickness and thermal insulator design could result in different conductivity values. These results were attributed to the phenomenon of heat dissipation from surface and the amount of direct radiation reached the sample. Specific susceptor thickness and specific insulator design which leads to highest conductivity were identified. By combining these two effects, the largest enhancement of conductivity of ceria based ceramics was obtained.</p>

    DOI: 10.2497/jjspm.63.663

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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, Reactivity of Solids   284   1 - 6   2016年1月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.ssi.2015.11.029

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  • セリア/ジルコニアセラミックス対のカチオン相互拡散に及ぼすミリ波照射の影響 査読

    脇本幹也、寺西貴志、林秀考、岸本昭

    粉体および粉末冶金   63 ( 11 )   981 - 985   2016年

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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.63.981

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  • In situ time-resolved dispersive X-ray absorption fine structure analysis of BaTiO3-LiCoO2 composites for lithium ion batteries 査読

    Takashi Teranishi*,Yumi Yoshikawa,Ryota Miyahara,Hidetaka Hayashi*,Akira Kishimoto*,Misaki Katayama,Yasuhiro Inada

    Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan, Yogyo Kyokai Shi/Journal of the Ceramic Society of Japan   124 ( 6 )   659 - 663   2016年

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.2109/jcersj2.16009

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  • 21aAF-3 BaTiO_3のバンド構造におけるイオン欠損効果

    押目 典宏, 狩野 旬, 池田 直, 寺西 貴志, 大崎 浩司, 藤井 達生, 上田 剛慈, 大久保 智子

    日本物理学会講演概要集   71   2691 - 2691   2016年

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    記述言語:日本語   出版者・発行元:一般社団法人日本物理学会  

    DOI: 10.11316/jpsgaiyo.71.1.0_2691

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

    T. Teranishi, Y. Yoshikawa, R. Sakuma, H. Okamura, H. Hashimoto, H. Hayashi, T. Fujii, A. Kishimoto, and Y. Takeda

    ECS Electrochemistry Letters   4   A137   2015年10月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

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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

    DOI: 10.7567/JJAP.54.10NB02

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

    T. Teranishi, Y. Yoshikawa, R. Sakuma, H. Okamura, H. Hayashi, A. Kishimoto, and Y. Takeda

    Japanese Journal of Applied Physics   54   10NB02   2015年9月

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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, journal of the japan society of powder and powder metallurgy, Journal of the Japan Society of Powder and Powder Metallurgy   63 ( 10 )   861 - 865   2015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)  

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

    A. Kishimoto, K. Yamashita, T. Teranishi, H. Hayashi and S. Sano

    Ceramics International   41   5785   2015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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  • Stabilisation dopant-dependent facilitation in ionic conductivity on millimetre-wave irradiation heating of zirconia-based ceramics 査読

    A. Kishimoto, H. Hasunuma, T. Teranishi and H. Hayashi

    Journal of Alloys and Compounds   648   740   2015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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  • Effect of Mg loading on the high-frequency tunability of Ba0.8Sr0.2TiO3 ceramics 査読

    T. Teranishi, T. Sogabe, H. Hayashi, A. Kishimoto, K. Iokibe, and Y. Toyota,

    Japanese Journal of Applied Physics   54   011502   2015年4月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

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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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  • 21pCJ-7 Ba_<0.8>Sr_<0.2>TiO_3のMgドープ効果

    押目 典宏, 狩野 旬, 大崎 浩司, 寺西 貴志, 吉田 右, 池田 直, 藤井 達生, 大久保 智子, 上田 剛慈

    日本物理学会講演概要集   70   2704 - 2704   2015年

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    記述言語:日本語   出版者・発行元:一般社団法人日本物理学会  

    DOI: 10.11316/jpsgaiyo.70.1.0_2704

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  • 22pCH-13 金属-強誘電体接合系での触媒作用

    狩野 旬, 池田 直, 押目 典宏, 藤井 達生, 橋本 英樹, 寺西 貴志, 大久保 智子, 上田 剛慈, 吉田 右, 秋山 雄介

    日本物理学会講演概要集   70   2743 - 2743   2015年

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    記述言語:日本語   出版者・発行元:一般社団法人日本物理学会  

    DOI: 10.11316/jpsgaiyo.70.1.0_2743

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

    T. Teranishi, Y. Yoshikawa, R. Sakuma, H. Hashimoto, H. Hayashi, A. Kishimoto, and T. Fujii

    Applied Physics Letters   105   143904   2014年10月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

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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.

    DOI: 10.1063/1.4898006

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

    T. Teranishi, A. Kouchi, H. Hayashi, and A. Kishimoto

    Solid State Ionics   263   33   2014年5月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

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

    A. Kishimoto, K. Ayano, T. Teranishi, and H. Hayashi

    The isothermal conductivity improvement in zirconia-based ceramics under 24 GHz microwave heating.   143   486 - 489   2014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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  • Relationship Between Phonon Parameters and Oxygen Ion Conductivity for Al?Yb Co-doped Zirconia 査読

    T. Teranishi, N. Matsubara, H. Hayashi, and A. Kishimoto

    Key Engineering Materials   582   107 - 110   2014年4月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

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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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  • Ferroelectric Domain Contribution to the Tunability of Ba08Sr02TiO3 Ceramics 査読

    Japanese Journal of Applied Physics   52   09KF06   2013年9月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Ferroelectric Domain Contribution to the Tunability of Ba0.8Sr0.2TiO3Ceramics

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

    Japanese Journal of Applied Physics   52 ( 9S1 )   09KF06 - 09KF06   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  

    DOI: 10.7567/jjap.52.09kf06

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

    Materials Science and Engineering: A   581   98 - 103   2013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)  

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

    Solid State Ionics   243   18 - 21   2013年5月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

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

    Materials Chemistry and Physics   139   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)  

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  • Thermoelectric Efficiency of Reduced SrTiO3 Ceramics Modified with La and Nb 査読

    Journal of the American Ceramics Society   96 ( 9 )   2852 - 2856   2013年5月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

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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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  • 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.

    DOI: 10.4028/www.scientific.net/MSF.735.109

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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 Reliable Porous Ceramics 査読

    Materials Science Forum   735   109 - 112   2012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)  

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  • 塑性発泡法によるセラミックスへの螺旋状連通閉気孔の導入 査読

    粉体および粉末冶金   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)  

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

    Journal of the American Ceramic Society   95 ( 2 )   690 - 695   2012年2月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

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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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  • ミリ波-HIP複合焼結法で焼成したAINセラミックスに及ぼす還元雰囲気の影響 査読

    粉体および粉末冶金   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)  

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

    Applied Physics Letters   100   242903   2012年1月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • 超塑性発泡法における窒化物系新規発泡剤の探索と特性評価 査読

    耐火物   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)  

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

    Japanese Journal of Applied Physics   51   011102   2011年12月

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

    Materials Science and Engineering B   177   69 - 73   2011年10月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

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

    Materials Letters   65   2197 - 2200   2011年4月

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  • Size effect and domain-wall contribution of barium titanate ceramics 査読

    Takuya Hoshina, Yoichi Kigoshi, Saki Hatta, Takashi Teranishi, Hiroaki Takeda, Takaaki Tsurumi

    Ferroelectrics   402 ( 1 )   29 - 36   2010年11月

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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)  

    Barium titanate (BaTiO3) ceramics with various grain sizes from 0.7 to 13 μm were prepared by a conventional sintering method and a two-step sintering method. The permittivity of the BaTiO3 ceramics with an average grain size of 1.1 μm exhibited a maximum around 8,000. By ultrawide range dielectric spectroscopy, the domain-wall contribution to the permittivity was investigated. For the BaTiO3 ceramics with grain sizes over 1 μm, the dipole and ionic polarizabilities were enhanced by the high domain density. In contrast, for the BaTiO3 ceramics with grain sizes below 1 μm, these polarizabilities were weakened. Copyright © 2010 Taylor & Francis Group, LLC.

    DOI: 10.1080/00150191003697179

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  • Effects of oxygen vacancies and grain sizes on the dielectric response of BaTiO3 査読

    Applied Physics Letters   97   212907-1 - 212907-3   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)  

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  • Analysis of polarization behavior in relaxation of BaTiO<inf>3</inf>-based ferroelectrics using wideband dielectric spectroscopy 査読

    Takashi Teranishi, Takuya Hoshina, Hiroaki Takeda, Takaaki Tsurumi

    IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control   57 ( 10 )   2118 - 2126   2010年10月

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    担当区分:筆頭著者   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)  

    Wideband dielectric spectra from the kilohertz to terahertz range are discussed for BaTiO3-based ferroelectrics. Ceramics of BaTiO3 (BT), Ba0.6Sr0.4TiO3 (BST-0.6), and BaZr0.25Ti0.75O3 (BZT-0.25) were selected as normal ferroelectrics, ferroelectrics with diffuse phase transition (DPT ferroelectrics), and relaxor ferroelectrics, respectively. The variation of ionic polarization in both BT and BST-0.6 ceramics with temperature could be explained by the softening of the soft phonon mode. In BZT-0.25, a permittivity anomaly at the dielectric maximum temperature (Tm) at low frequencies is not attributed to the softening of the soft phonon mode, but originates from the permittivity derived from the εdipole polarization (dipole). Relaxor behavior in BZT-0.25 is derived from the increase in the depression of εdipole on cooling across the Tm with increasing frequency. In εdipole polarization, BT, BST- 0.6, and BZT-0.25 all exhibited a similar tendency of εdipole above the Curie temperature (Tc) and Tm. However, behavior of εdipole below the Tc can be explained by the ferroelectric domains in BT, whereas the variation of εdipole below the Tm could be explained by growth process of polar nanoregions (PNRs) in BST-0.6 and BZT-0.25. Regarding this, BT can be distinguished from BST-0.6 and BZT-0.25. Relaxation in BT could be interpreted as successive change in polarization mechanism from normal ferroelectrics to relaxor ferroelectrics via DPT ferroelectrics. © 2010 IEEE.

    DOI: 10.1109/TUFFC.2010.1667

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  • Analysis on Dipole Polarization of BaTiO3-based Ferroelectric Ceramics by Raman Spectroscopy 査読

    Journal of the Ceramic Society of Japan   118   679 - 682   2010年8月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Analysis on dipole polarization of BaTiO3-based ferroelectric ceramics by Raman spectroscopy 査読

    Takashi Teranishi, Naohiro Horiuchi, Takuya Hoshina, Hiroaki Takeda, Takaaki Tsurumi

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   118 ( 1380 )   679 - 682   2010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  

    Analysis of asymmetric Raman line shape disclosed the variation of phonon correlation length in A(1)(3TO) mode, L-A1(3TO), with temperature in the ceramics of BaTiO3 (BT), Ba0.6Sr0.4TiO3 (BST-0.6) and BaZr0.25Ti0.75O3 (BZT-0.25), namely normal ferroelectrics, ferroelectrics with diffuse phase transition (DPT ferroelectrics) and relaxor ferroelectrics, respectively. In BT, L-A1(3TO) exhibited steep increase at the Curie temperature (T-c) on cooling. This is attributed to the formation of the ferroelectric domains at the T-c. Both BST-0.6 and BZT-0.25 showed gradual increase in L-A1(3TO) on cooling across the dielectric maximum temperature (T-m), indicating the continuous increase in the average size of the polar nanoregions (PNRs). Normal ferroelectrics can be distinguished from DPT and relaxor ferroelectrics in this point. L-A1(3TO) of BZT-0.25 was longer than that of BST-0.6 near the T-m. This suggests the size of PNRs in BZT-0.25 is larger than that in BST-0.6. Huge dipole polarization of BZT-0.25, giving rise to the strong relaxor behavior, could be originated from the contribution of the large PNRs near the T-m. DPT ferroelectrics can be also differentiated from relaxor ferroelectrics in terms of the average size of PNRs. (C) 2010 The Ceramic Society of Japan. All rights reserved.

    DOI: 10.2109/jcersj2.118.679

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  • Wide Band Dielectric Spectroscopy at Ferroelectric Phase Transition of BaTiO3 Ceramics 査読

    Japanese Journal of Applied Physics   49   041506-1 - 041506-4   2010年4月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Wide Range Dielectric Spectroscopy of Barium Strontium Titanate Ceramics 査読

    Takashi Teranishi, Takuya Hoshina, Hiroaki Takeda, Takaaki Tsurumi

    Key Engineering Materials (ASIAN CERAMIC SCIENCE FOR ELECTRONICS III AND ELECTROCERAMICS IN JAPAN XII)   421-422   273 - 276   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  

    Wide band dielectric spectroscopy was applied from kHz to THz region for the analysis of both the ionic and the dipole polarization in Ba(0.6)Sr(0.4)TiO(3) ceramics. The dielectric permittivity above the dielectric maximum temperature (T(m)) is mostly dominated by the ionic polarization, while that below T(m) is governed by the dipole polarization. Dielectric permittivity given by the dipole polarization increased and the relaxation frequency decreased with decreasing temperature. These phenomena are related to a increase of the size of polar nanoregions (PNRs).

    DOI: 10.4028/www.scientific.net/KEM.421-422.273

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  • Dielectric Properties of Barium Titanate Ceramics with Nano-Sized Domain 査読

    Yoichi Kigoshi, Saki Hatta, Takashi Teranishi, Takuya Hoshina, Hiroaki Takeda, Osamu Sakurai, Takaaki Tsururni

    Key Engineering Materials (ELECTROCERAMICS IN JAPAN XIII)   445   27 - 30   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  

    Barium titanate (BaTiO3) ceramics with various grain sizes from 0.7 to 13 mu m on average were prepared by a conventional sintering method, a two-step sintering method and a rate controlled two-step sintering method. The permittivity of the ceramics was increased with decreasing grain size to 1.1 mu m on average. However, the permittivity of the ceramics was decreased when the grain size was below 1 mu m. The field emission scanning electron microscope (FE-SEM) observations revealed that the 900 domain width decreased with decreasing the grain size. By ultrawide range dielectric spectra from kHz to THz range of the BaTiO3 ceramics, the domain contribution to the permittivity was investigated. For the BaTiO3 ceramics with grain sizes over 1 mu m, the dipole polarizability and the ionic polarizability were enhanced by high domain-wall density. In contrast, for the BaTiO3 ceramics with grain sizes below 1 mu m, these polarizabilities were weakened.

    DOI: 10.4028/www.scientific.net/KEM.445.27

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  • Wide Range Dielectric Spectroscopy on Perovskite Dielectrics 査読

    Materials Science and Engineering: B   161   55 - 60   2009年4月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Polarization Behavior in Diffuse Phase Transition of BaxSr1−xTiO3 Ceramics 査読

    Journal of Applied Phyics   105   054111-1 - 054111-5   2009年3月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Ultrawideband Dielectric Spectroscopy of BaZrxTi1−xO3 Ceramics and Its Microscopic Mechanism of Polarization 査読

    Journal of Applied Phyics   105   114102-1 - 14102-4   2009年1月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

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▼全件表示

MISC

  • BaTiO3担持リチウムイオン薄膜電池の固体電解質界面(SEI)形成に対する電解液依存性 II

    七澤太梧, 安原颯, 寺西貴志, 伊藤あゆみ, 小林能直, 安井伸太郎

    日本セラミックス協会秋季シンポジウム講演予稿集(Web)   35th   2022年

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  • 電解質支持型酸化物系全固体リチウムイオン電池の高性能化

    浜田果周, 本林秀文, 樋口拓実, 寺西貴志, 安井伸太郎, 安原颯, 近藤真矢, 田崎雄三, 中村亨, 岸本昭

    日本セラミックス協会秋季シンポジウム講演予稿集(Web)   35th   2022年

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  • 誘電体界面を導入した酸化物系全固体電池の作製

    樋口拓実, 浜田果周, 寺西貴志, 安井伸太郎, 安原颯, 近藤真矢, 岸本昭

    日本セラミックス協会秋季シンポジウム講演予稿集(Web)   35th   2022年

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  • 負極Li4Ti5O12エピタキシャル薄膜上への三相界面導入

    安原颯, 安井伸太郎, 保科拓也, 鶴見敬章, 寺西貴志, 伊藤満

    日本セラミックス協会年会講演予稿集(Web)   2021   2021年

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  • 誘電体を介したリチウムイオン電池界面の高速電荷移動

    寺西貴志, 山中亮治, 近藤真矢, 岸本昭, 三村憲一, 加藤一実, 安原颯, 安井伸太郎

    日本セラミックス協会年会講演予稿集(Web)   2021   2021年

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  • BaTiO3-LiCoO2-電解液三相界面近傍のSEI観察

    安原颯, 安井伸太郎, 保科拓也, 鶴見敬章, 寺西貴志, 伊藤満

    日本セラミックス協会秋季シンポジウム講演予稿集(CD-ROM)   33rd   2020年

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  • 充放電サイクル後の「LiCoO2-BaTiO3-電解液」三相界面の観察

    安原颯, 吉川祐未, 寺西貴志, 坂田修身, 安井伸太郎, 谷山智康, 谷山智康, 伊藤満

    応用物理学会春季学術講演会講演予稿集(CD-ROM)   66th   2019年

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  • 酸化物ドットを担持したLiCoO2エピタキシャル薄膜の作製とその高速充放電特性のドット種依存性

    安原颯, 吉川祐未, 寺西貴志, 安井伸太郎, 谷山智康, 伊藤満

    応用物理学会春季学術講演会講演予稿集(CD-ROM)   65th   2018年

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  • 誘電体界面を利用した急速充放電型Liイオン電池の開発

    吉川祐未, 寺西貴志, 勝治直人, 岸本昭, 安原颯, 安井伸太郎, 伊藤満

    日本セラミックス協会秋季シンポジウム講演予稿集(CD-ROM)   31st   2018年

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  • 酸化物ドットを担持したLiCoO2エピタキシャル薄膜の作製とその高速充放電特性のドット種依存性

    安原颯, 吉川祐未, 寺西貴志, 安井伸太郎, 谷山智康, 谷山智康, 伊藤満

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)   79th   2018年

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  • 高速充放電Liイオン電池に向けた誘電体SEIの開発

    吉川祐未, 勝治直人, 安原颯, 安井伸太郎, 寺西貴志, 林秀考, 岸本昭, 伊藤満

    エレクトロセラミックス研究討論会講演予稿集   37th   2017年

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  • 強誘電体-活物質ナノ積層正極膜の電池特性評価

    茶島圭介, 寺西貴志, 林秀考, 岸本昭, 安原颯, 安井伸太郎, 伊藤満

    セラミックス基礎科学討論会講演要旨集   55th   2017年

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  • 強誘電体-活物質ナノ積層正極膜の電池特性評価

    茶島圭介, 寺西貴志, 林秀考, 岸本昭, 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)   2016   2016年

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  • BaTiO3/LiCoO2エピタキシャル薄膜の作製と正極特性の評価

    安原颯, 安井伸太郎, 寺西貴志, 伊藤満

    セラミックス基礎科学討論会講演要旨集   54th   2016年

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  • BaTiO3-LiCoO2ナノ積層正極膜における高出力特性

    茶島圭介, 寺西貴志, 林秀考, 岸本昭, 安原颯, 安井伸太郎, 伊藤満

    日本セラミックス協会秋季シンポジウム講演予稿集(CD-ROM)   29th   2016年

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  • エピタキシャルBaTiO3/LiCoO2薄膜の界面状態と正極特性

    安原颯, 茶島圭介, 寺西貴志, 勝矢良雄, 坂田修身, 安井伸太郎, 谷山智康, 伊藤満

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)   77th   2016年

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  • Wide Band Dielectric Spectroscopy at Ferroelectric Phase Transition of BaTiO3 Ceramics

    Takashi Teranishi, Takuya Hoshina, Hiroaki Takeda, Takaaki Tsurumi

    Jpn. J. Appl. Phys.   49   041506 (4 pages)   2010年

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  • Ultrawideband dielectric spectroscopy of BaZrxTi1-xO3 ceramics and its microscopic mechanism of polarization

    Takashi Teranishi, Takuya Hoshina, Hiroaki Takeda, Takaaki Tsurumi

    JOURNAL OF APPLIED PHYSICS   105 ( 11 )   114102   2009年6月

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    記述言語:英語   出版者・発行元:AMER INST PHYSICS  

    Ultrawideband dielectric spectroscopy analysis of barium zirconate titanate (BaZrxTi1-xO3, BZT) ceramics at different temperatures disclosed the contribution of both the dipole and the ionic polarizations to permittivity at around dielectric maximum temperature (T-m). In BaZr0.25Ti0.75O3 ceramics, the permittivity around Tm is dominated by the temperature dependence of the permittivity determined by the dipole polarization (epsilon(dipole)). In relaxor ferroelectrics, the diffuse dielectric response around Tm could be derived from the temperature dependence of epsilon(dipole). The variation of epsilon(dipole) with temperature could be also explained by the growth process of polar nanoregions (PNRs) and the damping process of the thermal fluctuation of dipoles in PNRs. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3131624]

    DOI: 10.1063/1.3131624

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  • Wide range dielectric spectroscopy on perovskite dielectrics 査読

    Takashi Teranishi, Takuya Hoshina, Takaaki Tsurumi

    Materials Science and Engineering: B   161 ( 1-3 )   55 - 60   2009年4月

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    記述言語:英語   出版者・発行元:Elsevier BV  

    Wide band dielectric spectra from the kilohertz to terahertz range were discussed for SrTiO(3) (ST) and BaTiO(3)-based ceramics. The dielectric permittivity of BaTiO(3) (BT) is determined by the ionic polarization of the Slater mode as well as the dipole polarization of domain-wall vibrations in micro-sized domains. (Ba(x),Sr(1-x))TiO(3) (BST) shows relatively high dielectric permittivity with a low dielectric loss up to GHz region, while Ba(Zr(x)Ti(1-x))O(3) (BZT) shows a high permittivity with dielectric relaxation at MHz range. The dielectric dispersion in the BZT was due to the dipole fluctuation in polar nano-regions (PNR) in relaxors. The change of dielectric spectrum from BT to BZT was interpreted by the change from normal ferroelectrics to relaxors via ferroelectrics with diffuse phase transition (DPT-ferro.). Wide band dielectric spectra were also measured for BT ceramics with different grain and domain sizes to elucidate the size effect observed in BT ceramics. The low-frequency permittivity increased with decreasing grain size when the grain size was above 1 mu m. It was found that the dipole polarization due to the domain-wall motion was enhanced with increasing domain density. We demonstrated wide band dielectric spectroscopy is a powerful tool to investigate the polarization mechanism of dielectric and ferroelectric materials. (C) 2008 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.mseb.2008.11.039

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  • Polarization behavior in diffuse phase transition of BaxSr1-xTiO3 ceramics

    Takashi Teranishi, Takuya Hoshina, Hiroaki Takeda, Takaaki Tsurumi

    JOURNAL OF APPLIED PHYSICS   105 ( 5 )   054111   2009年3月

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    記述言語:英語   出版者・発行元:AMER INST PHYSICS  

    Ultrawide band dielectric spectroscopy analysis of barium strontium titanate [BaxSr1-xTiO3 (BST)] ceramics at different temperatures disclosed a contribution of the dipole and the ionic polarizations to their diffuse phase transition (DPT). In the BST ceramics, thermal behavior of the ionic polarization governs the DPT. The dielectric maximum temperature (T-m) is in agreement with the maximum temperature of the permittivity determined by the ionic polarization. The maximum of the permittivity determined by the ionic polarization at the T-m is caused from the decrement of the vibration frequency of the soft mode. The dipole polarization gives small contribution to the DPT. The gradual increase in the permittivity determined by the dipole polarization with decreasing temperature could be explained by the increase in the size of the polar nanoregions.

    DOI: 10.1063/1.3089250

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産業財産権

  • 電極及び電極の製造方法

    寺西 貴志, 岸本 昭, 布施 裕大, 平松 健矢, 山田 博俊

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    出願人:国立大学法人 岡山大学

    出願番号:特願2019-199388  出願日:2019年10月31日

    公開番号:特開2021-072232  公開日:2021年5月6日

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  • リチウムイオン電池の正極材料の製造方法及びリチウムイオン電池の製造方法

    依田 孝次, 寺西 貴志

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    出願人:株式会社豊島製作所

    出願番号:特願2019-195657  出願日:2019年10月28日

    公開番号:特開2021-068683  公開日:2021年4月30日

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  • 電気熱量材料の特性評価装置、その方法、及びそのプログラム

    井口 亮, 内田 健一, 狩野 旬, 寺西 貴志

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    出願人:国立研究開発法人物質・材料研究機構

    出願番号:特願2019-136550  出願日:2019年7月25日

    公開番号:特開2021-021578  公開日:2021年2月18日

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  • リチウムイオン二次電池用正極材料

    堀川 大介, 山本 雄治, 寺西 貴志

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    出願人:トヨタ自動車株式会社

    出願番号:特願2019-123080  出願日:2019年7月1日

    公開番号:特開2021-009801  公開日:2021年1月28日

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  • 二次電池用電極材料

    山本 雄治, 三村 憲一, 加藤 一実, 寺西 貴志

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    出願人:トヨタ自動車株式会社

    出願番号:特願2019-109646  出願日:2019年6月12日

    公開番号:特開2020-202124  公開日:2020年12月17日

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  • 二次電池の正極材料、およびこれを用いた二次電池

    堀川 大介, 山本 雄治, 寺西 貴志

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    出願人:トヨタ自動車株式会社

    出願番号:特願2019-106059  出願日:2019年6月6日

    公開番号:特開2020-202022  公開日:2020年12月17日

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  • リチウム二次電池の正極材料、およびこれを用いたリチウム二次電池

    堀川 大介, 山本 雄治, 寺西 貴志

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    出願人:トヨタ自動車株式会社

    出願番号:特願2019-106058  出願日:2019年6月6日

    公開番号:特開2020-202021  公開日:2020年12月17日

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  • 二次電池の正極、およびこれを用いた二次電池

    堀川 大介, 山本 雄治, 寺西 貴志

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    出願人:トヨタ自動車株式会社

    出願番号:特願2019-106060  出願日:2019年6月6日

    公開番号:特開2020-202023  公開日:2020年12月17日

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  • 正極材料とこれを用いた二次電池

    堀川 大介, 杉浦 隆太, 寺西 貴志

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    出願人:トヨタ自動車株式会社

    出願番号:特願2018-200563  出願日:2018年10月25日

    公開番号:特開2020-068135  公開日:2020年4月30日

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  • キャパシタ、キャパシタ用固体電解質粒子の製造方法、及び、キャパシタの製造方法

    清水 正義, 畠 宏太郎, 寺西 貴志

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    出願人:サムソン エレクトロ-メカニックス カンパニーリミテッド.

    出願番号:特願2018-144604  出願日:2018年7月31日

    公開番号:特開2020-021826  公開日:2020年2月6日

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  • 電極評価装置、電極評価方法及び電池キット

    紀和 利彦, 寺西 貴志

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    出願人:国立大学法人 岡山大学

    出願番号:特願2018-138037  出願日:2018年7月23日

    公開番号:特開2020-016479  公開日:2020年1月30日

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  • 正極材料とこれを用いたリチウム二次電池

    堀川 大介, 杉浦 隆太, 寺西 貴志

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    出願人:トヨタ自動車株式会社

    出願番号:特願2017-237310  出願日:2017年12月12日

    公開番号:特開2019-106276  公開日:2019年6月27日

    特許番号/登録番号:特許第6919994号  登録日:2021年7月28日 

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  • 正極材料とこれを用いたリチウム二次電池

    堀川 大介, 杉浦 隆太, 寺西 貴志

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    出願人:トヨタ自動車株式会社

    出願番号:特願2017-237311  出願日:2017年12月12日

    公開番号:特開2019-106277  公開日:2019年6月27日

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  • 正極材料とこれを用いたリチウム二次電池

    堀川 大介, 杉浦 隆太, 寺西 貴志

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    出願人:トヨタ自動車株式会社

    出願番号:特願2017-237310  出願日:2017年12月12日

    公開番号:特開2019-106276  公開日:2019年6月27日

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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 昂佑

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    出願人:国立大学法人 岡山大学

    出願番号:特願2017-123010  出願日:2017年6月23日

    公開番号:特開2019-009252  公開日:2019年1月17日

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  • リチウムイオン二次電池用正極材料

    堀川 大介, 杉浦 隆太, 寺西 貴志

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    出願人:トヨタ自動車株式会社

    出願番号:特願2017-079861  出願日:2017年4月13日

    公開番号:特開2018-181614  公開日:2018年11月15日

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  • リチウムイオン電池の正極材料の製造方法及びこの方法で製造した電極材料

    寺西 貴志, 岸本 昭, 吉川 祐未

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    出願人:国立大学法人 岡山大学

    出願番号:特願2015-025824  出願日:2015年2月12日

    公開番号:特開2016-149270  公開日:2016年8月18日

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  • リチウムイオン電池の正極材料の製造方法及びこの方法で製造した電極材料

    寺西 貴志, 岸本 昭, 吉川 祐未

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    出願人:国立大学法人 岡山大学

    出願番号:特願2015-025824  出願日:2015年2月12日

    公開番号:特開2016-149270  公開日:2016年8月18日

    特許番号/登録番号:特許第6551878号  登録日:2019年7月12日 

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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, 須田 聖一, 寺西 貴志, 近藤 真矢

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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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  • 界面ポテンシャル制御による高性能酸化物系全固体電池の実現

    研究課題/領域番号:21H01625  2021年04月 - 2024年03月

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    寺西 貴志, 中山 将伸, 三村 憲一, 近藤 真矢, 岸本 昭

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    配分額:17420000円 ( 直接経費:13400000円 、 間接経費:4020000円 )

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  • 熱イメージングを用いた誘電体における熱電現象・電場誘起熱応答の開拓

    研究課題/領域番号:20H02609  2020年04月 - 2023年03月

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    井口 亮, 寺西 貴志, 狩野 旬, 内田 健一

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    配分額:18200000円 ( 直接経費:14000000円 、 間接経費:4200000円 )

    本研究は、誘電体において電場が誘起する熱現象を詳らかにし、誘電体の熱制御の方法や熱応答の理解の刷新を狙うものである。本年度は、サーモグラフィ法を用いて誘電体における縦熱電効果(電場と熱流方向が平行)の温度依存性および物質依存性の計測、そしてその定量化を目指した取り組みを行った。特に、交流サーモグラフィ計測における定量性の確保のため、評価・実験面での取り組みに力を入れた。実験結果の議論を行うためには、交流熱応答から適切な物理量を定量的に抽出する必要があり、既知の電気熱量効果をモデルとして評価法の構築に取り組んだ。熱リークや電気熱量効果そのものの周波数依存性を取り入れた評価法を検討した結果、赤外線カメラ自体の応答の補正も組み入れる必要性が分かった。これに対応した交流サーモグラフィ計測評価法を完成させ、電気熱量効果を対象として論文として公表する準備を進めた。実験面では、誘電体試料の電極および配線の間の接触状態によって、対象とする効果の温度変化量が変わる懸念があり、サーモグラフィ計測および高電圧印加と両立するプロービングシステムを設計し、準備を進めた。また、計画していた異種誘電体接合系における実験も進めた。電気的特性および機械的特性は問題なく、今後詳細な熱測定と解析を進める予定である。加えて、新たに物質依存性測定の一環として開始した単結晶試料を用いた実験においても進展があった。その熱信号は非自明な空間分布を有しており、縦熱電効果において誘電秩序の果たす想定外の役割がある可能性がある。これを明らかにすべく、可視光用の測定系をサーモグラフィと組み合わせた赤外-可視同時計測にも取り組んだ。

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  • 誘電体ナノ分極界面を利用した超高出力全固体リチウム二次電池の実現

    研究課題/領域番号:18H01707  2018年04月 - 2021年03月

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    寺西 貴志, 中山 将伸, 秋本 順二, 岸本 昭, 安井 伸太郎

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    配分額:17290000円 ( 直接経費:13300000円 、 間接経費:3990000円 )

    本研究は全固体リチウムイオン二次電池の活物質-固体電解質層間に,誘電体ナノ分極界面を導入することで空間電荷層中のLi移動を促進し,キャパシタ並みの出力特性,すなわち秒単位での超急速充放電の実現を目指している.我々はこれまで従来の有機電解液系リチウムイオン電池において,誘電分極が活物質-電解液界面のLi電荷移動抵抗を顕著に軽減させることを実証してきたが,本知見を全固体電池に応用展開させたものである.
    昨年度までに,疑似全固体電池および硫化物系全固体電池において,BaTiO3(BTO)系誘電体界面がセル特性を一定程度改善することが分かった.本年度は,バルク型酸化物全固体電池において誘電体界面の効果を検証した.正極複合粉末にはBTOを1~10mol%担持させたLiCoO2とした.電解質にはLLZT,負極にIn合金を用いた。電池の構造は電解質支持型とした.比較的低温にて熱処理を行い,電解質―電極間の界面形成を行った.続いて全固体電池の評価を室温にて行った.電流レート0.1C(1C=160mA/g)において,未処理LCOにおいては70mAh/g程度の電池容量が得られたが,一方,BTO担持試料においてはいずれの担持量においても同レートにおいて50mAh/g程度と容量は減少した.今回作製した全固体電池の構造においては,界面電荷移動抵抗が律速抵抗となっていない可能性や,電解質から活物質へ直接的にLi界面移動が生じ,BTO表面を介した電荷移動機構となっていない可能性等が示唆された.今後,これらの検証が必要である.

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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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  • 正負極分極アシストによる超高速充放電Liイオン電池の実現

    研究課題/領域番号:16K14094  2016年04月 - 2018年03月

    日本学術振興会  科学研究費助成事業  挑戦的萌芽研究

    寺西 貴志, 仁科 勇太, 岸本 昭, 林 秀考

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    配分額:3770000円 ( 直接経費:2900000円 、 間接経費:870000円 )

    秒単位での超高速充放電が可能なLiイオン電池の開発が求められている.本研究は正負両極に分極アシスト機構を同時導入することで界面電荷移動の活性を相乗効果的に高めることを目的とした.正極にチタン酸バリウムBaTiO3を液相法により担持したLiCoO2を,負極は酸化グラフェンrGOおよびそれを窒化したN-rGOを作製し,全電池評価を行った.結果,正極BTO-LCO/負極rGOにおいて,改質前の試料(未処理LCO/グラファイト)に対して,10Cレート・5サイクル目で約15倍もの容量改善があった.正負極に導入した分極アシスト機構により,Liイオン電池の出力特性を劇的に改善できることが明らかとなった.

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  • 高速充放電リチウムイオン電池用正極に向けた強誘電体/活物質ナノコンポジットの創製

    研究課題/領域番号:15H04126  2015年04月 - 2018年03月

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    寺西 貴志, 岸本 昭, 安井 伸太郎, 保科 拓也, 林 秀考

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    配分額:17030000円 ( 直接経費:13100000円 、 間接経費:3930000円 )

    次世代型車載用蓄電池に向けて,超高出力型Liイオン電池に対する需要が急速に高まりつつある.著者らは正極活物質-電解液界面における電荷移動促進を狙いとして,強誘電体ナノ粒子を人工界面層として適用した複合正極を新たに提案した.実際,チタン酸バリウムBaTiO3をLi活物質LiCoO2上に液相法により少量担持させた複合正極において,出力特性すなわち高速充放電特性を大幅に改善することに成功した.インピーダンス解析や薄膜電池を用いた一連の検証実験結果から,電界が集中する強誘電体-活物質-電解液の三相界面付近にLi優先拡散パスが存在し,三相界面密度が出力特性を決めうる重要なパラメータであると推察された.

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  • ミリ波照射下でのイオン伝導促進現象の解明と固体酸化物燃料電池への応用

    研究課題/領域番号:26630318  2014年04月 - 2016年03月

    日本学術振興会  科学研究費助成事業  挑戦的萌芽研究

    岸本 昭, 林 秀考, 寺西 貴志

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    配分額:3900000円 ( 直接経費:3000000円 、 間接経費:900000円 )

    固体酸化物型燃料電池の電解質の候補である安定化ジルコニアセラミックス、希土類添加セリアセラミックスをミリ波照射で加熱し、イオン伝導の促進について調査を行なった。ミリ波加熱昇温によりイオン伝導度が促進するが、促進割合は周囲の熱環境に依存し、自己発熱が大きく温度勾配が小さいほど促進度合いが大きいことがわかった。最適化された熱環境でのイオン伝導促進率は添加物に依存し通常加熱の20倍を超えるものを見出した。

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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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  • 大容量キャパシタに向けたリチウムイオン伝導体/誘電体ナノコンポジット材料の創製

    研究課題/領域番号:25820332  2013年04月 - 2015年03月

    日本学術振興会  科学研究費助成事業  若手研究(B)

    寺西 貴志

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    配分額:4420000円 ( 直接経費:3400000円 、 間接経費:1020000円 )

    大容量キャパシタの基盤材料に向けて高速Liイオン伝導体と誘電体酸化物のナノ複合材料を作製し,巨大誘電率を実現させることを目的とした.まずLiイオン伝導体において,ペロブスカイトAサイトイオンの半径を制御することにより,効果的にLiイオン導電率を改善することに成功した.次にLiイオン伝導体-誘電体の2次元・3次元構造を持つコンポジット材料を作製し電気評価を行ったが,現在までに検討した系においては大容量化と低誘電損失の両立化は達成することができなかった.

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  • イオン伝導性酸化物における広帯域導電率測定による格子振動解析

    研究課題/領域番号:23750242  2011年 - 2012年

    日本学術振興会  科学研究費助成事業  若手研究(B)

    寺西 貴志

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    配分額:4420000円 ( 直接経費:3400000円 、 間接経費:1020000円 )

    酸化物イオン伝導体セラミックスにおいて,電気領域(数 Hz 以上)から光領域(THz)に及ぶ広周波数帯域における複素導電率を連続的に評価する手法を開発した.本手法を用いて,代表的な酸化物イオン伝導体(イットリア安定化ジルコニア等)について評価を行い,格子振動の振る舞いとイオン導電率の関係を定量的に調べた.結果,格子振動定数のうちダンピングファクター(振動の減衰項)が小さいほど,イオン導電率が高いという一定の相関を見出すことができた.

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  • チタン酸バリウムストロンチウムにおける高周波誘電特性の発現メカニズムの解明

    研究課題/領域番号:09J08561  2009年 - 2010年

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    寺西 貴志

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    配分額:1400000円 ( 直接経費:1400000円 )

    H21年度までにおいて,通常の強誘電体であるBaTiO3(BT),リラクサー強誘電体であるBaZr0.25Ti0.7503(BZT-0.25),散漫相転移型強誘電体であるBST-0.6について,新規に開発した広帯域誘電分散測定法を用いて,kHz~THzまでの広帯域複素誘電率を測定し,双極子分極、イオン分極、電子分極由来の誘電率を同時に定量化した.結果,通常の強誘電体である,BTにおいてキュリー温度(相転移温度)以上の本来常誘電領域で,双極子分極がBZT-0.25やBST0.6と同様な挙動を示すことがわかった.本年度は,より詳細にBTにおける双極子分極の挙動を解析するため,キュリー温度付近でラマン分光測定を行った.さらに測定したラマン強度を,フォノン相互作用長(Lphonon)を用いたラマン強度の理論式で最小二乗フィッティングし,Lphononの温度変化を調べた.結果,Lphononはキュリー点以上においても0とはならず,正の値を持つことが分かった.Lphononの大きさは,双極子のクラスターサイズを反映していることから,BTの常誘電相においてナノサイズ分極領域(Polar nanoregions,PNRs)が存在していることを示唆する結果となった.この結果は,前年度までに得られた広帯域誘電率測定の結果をサポートするものであり,強誘電体BTにおける常誘電相での双極子分極の起源に大きく迫ることができたといえる.

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