Updated on 2025/09/30

写真a

 
FUJII Tatsuo
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Professor
Position
Professor
External link

Degree

  • 理学博士 ( 京都大学 )

Research Interests

  • Photoelectron spectroscopy

  • 遷移金属酸化物

  • Magnetic materials

  • Mossbauer spectroscopy

  • Ceramics

  • Ferrites

  • Thin films

  • Transition metal oxides

  • 光電子分光

  • メスバウアー分光

  • 高周波材料

  • X線分光

  • 磁性体

  • 誘電体

  • フェライト

Research Areas

  • Nanotechnology/Materials / Inorganic materials and properties

  • Nanotechnology/Materials / Functional solid state chemistry

 

Papers

  • Preparation and Microstructure of Bluish Glass Reviewed

    S. Murase, A. Kaminaga, H. Uenishi, R. Maki, T. Fujii, M. Takano, Y. Kusano

    Proceedings of 2024 Powder Metallurgy World Congress & Exhibition   1654 - 1657   2024.12

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  • Synthesis of Tubular Iron Oxide Pigments with Bright Red Color Deposited on Phosphorylated Cellulose Nanofibers Reviewed

    K. Suga, Y. Oshima, T. Okihara, T. Fujii

    Proceedings of 2024 Powder Metallurgy World Congress & Exhibition   889 - 892   2024.12

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  • Preparation of Lepidocrocite and Maghemite by the Addition of Calcite to Iron(II) Chloride Solutions Reviewed

    N. Arinobu, R. Maki, T. Ogawa, T. Fujii, Y. Kusano

    Proceedings of 2024 Powder Metallurgy World Congress & Exhibition   1570 - 1573   2024.12

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  • Synthesis of Carbon Nanowalls using Plasma-Irradiated Solid Carbon and Absorption of Cs in Water Reviewed

    Yukimasa Fukada, Yumito Aoyagi, Misaki Yokoyama, Yoichi Horibe, Jun Kano, Miyu Kaneda, Tatsuo Fujii, Akitaka Yoshigoe, Masaaki Kobata, Tatsuo Fukuda, Kenji Yoshii, Naoshi Ikeda

    Journal of Electronic Materials   54 ( 1 )   686 - 692   2024.11

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    Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    DOI: 10.1007/s11664-024-11586-9

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    Other Link: https://link.springer.com/article/10.1007/s11664-024-11586-9/fulltext.html

  • 鉄複電荷酸化物RFe2O4が示す電子強誘電性の研究 Reviewed

    沖本洋一, 藤井達生, 池田直

    日本結晶学会誌   66 ( 2 )   103 - 108   2024.6

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  • Influence of viscosity and composition of alkali borosilicate lead-free frit on its reaction with hematite, and the color control of red overglaze enamels Reviewed

    Misa Ogawa, Yuuka Kokubo, Yuto Okawara, Hirofumi Inada, Taigo Takaishi, Tatsuo Fujii, Toshinori Okura, Hideki Hashimoto

    Journal of the European Ceramic Society   43 ( 15 )   7205 - 7214   2023.12

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.jeurceramsoc.2023.07.035

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  • Attempt for Fabrication of Acicular Hexagonal Ferrite Particles Elongated in the c-axis Direction Reviewed

    Kanpei NISHIOKA, Yu YAMAMOTO, Masakuni TAKAHASHI, Jun KANO, Tatsuo FUJII

    Journal of the Japan Society of Powder and Powder Metallurgy   70 ( 9 )   398 - 401   2023.9

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    Authorship:Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Powder and Powder Metallurgy  

    DOI: 10.2497/jjspm.23-00019

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  • Co-substituted Ca–La magnetoplumbite ferrite microwave absorbers at 100 GHz Reviewed

    Kazushige Hyodo, Jun Kano, Makoto Nakanishi, Tatsuo Fujii

    Applied Physics Letters   122 ( 11 )   2023.3

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    Millimeter wave absorption exceeding 70 GHz has been performed in a Co-substituted Ca–La magnetoplumbite (M-type) ferrite. A polymerized complex method was used to increase the substitution of La and Co ions in the M-type ferrite. The increase in the magnetic anisotropy field combined with the remaining significant saturation magnetization results in good magnetic resonance absorption in the millimeter range of 70–100 GHz. Above 70 GHz, good millimeter wave absorption of more than −20 dB was achieved in 0.25 mm thickness plates of Ca0.46La0.54Fe11Co0.28O19-η and Ca0.42La0.58Fe11Co0.58O19-η. Highly Co-substituted Ca–La M-type ferrites may, thus, be promising candidates for magnetic absorption materials operating in frequencies of up to 100 GHz.

    DOI: 10.1063/5.0133578

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  • Nonlinear Optical Properties in an Epitaxial YbFe2O4 Film Probed by Second Harmonic and Terahertz Generation Reviewed

    Hongwu Yu, Yoichi Okimoto, Atsuya Morita, Shuhei Shimanuki, Kou Takubo, Tadahiko Ishikawa, Shin-ya Koshihara, Ryusei Minakami, Hirotake Itoh, Shinichiro Iwai, Naoshi Ikeda, Takumi Sakagami, Mayu Nozaki, Tatsuo Fujii

    Materials   16 ( 5 )   1989 - 1989   2023.2

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    An epitaxial film of YbFe2O4, a candidate for oxide electronic ferroelectrics, was fabricated on yttrium-stabilized zirconia (YSZ) substrate by magnetron sputtering technique. For the film, second harmonic generation (SHG), and a terahertz radiation signal were observed at room temperature, confirming a polar structure of the film. The azimuth angle dependence of SHG shows four leaves-like profiles and is almost identical to that in a bulk single crystal. Based on tensor analyses of the SHG profiles, we could reveal the polarization structure and the relationship between the film structure of YbFe2O4 and the crystal axes of the YSZ substrate. The observed terahertz pulse showed anisotropic polarization dependence consistent with the SHG measurement, and the intensity of the emitted terahertz pulse reached about 9.2% of that emitted from ZnTe, a typical nonlinear crystal, implying that YbFe2O4 can be applied as a terahertz wave generator in which the direction of the electric field can be easily switched.

    DOI: 10.3390/ma16051989

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  • Uniform Formation of a Characteristic Nanocomposite Structure of Biogenous Iron Oxide for High Rate Performance as the Anode of Lithium-Ion Batteries Reviewed

    Masakuni Takahashi, Ryo Sakuma, Hideki Hashimoto, Tatsuo Fujii, Jun Takada

    JOURNAL OF PHYSICAL CHEMISTRY C   2223 - 2230   2023.1

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    DOI: 10.1021/acs.jpcc.2c08380

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  • Spinodal Decomposition in the Mg–Al–Fe–O System Reviewed

    Yoshihiro Kusano, Taiki Furuta, Ryosuke Maki, Tomoyuki Ogawa, Tatsuo Fujii

    Inorganic Chemistry   61 ( 45 )   18170 - 18180   2022.11

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    Publishing type:Research paper (scientific journal)   Publisher:American Chemical Society (ACS)  

    DOI: 10.1021/acs.inorgchem.2c02843

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  • Eco-Benign Orange-Hued Pigment Derived from Aluminum-Enriched Biogenous Iron Oxide Sheaths. Reviewed International journal

    Katsunori Tamura, Yuri Oshima, Yuta Fuse, Noriyuki Nagaoka, Tatsuki Kunoh, Makoto Nakanishi, Tatsuo Fujii, Tokuro Nanba, Jun Takada

    ACS omega   7 ( 15 )   12795 - 12802   2022.4

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    Inorganic pigments have been widely used due to their low cost of production, strong hiding power, and chemical resistance; nevertheless, they have limited hue width and chromaticity. To eliminate these disadvantages, we herein propose the use of an ingenious biotemplate technique to produce Al-enriched biogenic iron oxide (BIOX) materials. Spectrophotometric color analysis showed that high levels of Al inclusion on heat-treated BIOX samples produced heightened yellowish hues and lightness. The Al-enriched BIOX sheaths exhibited a stable tubular structure and excellent thermal stability of color tones after heating at high temperatures and repetitive heat treatments. Ultrastructural analysis and mechanical destruction experiments revealed that the highly chromatic orange-hue of these pigments are ascribed probably to an ingenious cylindrical nanocomposite architecture composed of putative Fe-included low crystalline Al oxide regions and hematite particles embedded therein. The present work therefore demonstrates that the bioengineered material can serve as an epochal orange-hued inorganic pigment with low toxicity and marked thermostability that should meet large industrial demand.

    DOI: 10.1021/acsomega.1c07390

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  • Valence control of charge and orbital frustrated system YbFe<inf>2</inf>O<inf>4</inf> with electrochemical Li+ intercalation Reviewed

    S. Murase, Y. Yoshikawa, K. Fujiwara, Y. Fukada, T. Teranishi, J. Kano, T. Fujii, Y. Inada, M. Katayama, K. Yoshii, T. Tsuji, D. Matsumura, N. Ikeda

    Journal of Physics and Chemistry of Solids   162   110468   2022.3

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    DOI: 10.1016/j.jpcs.2021.110468

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  • High valence states of Pd supported on ferroelectric BaTiO3 driven by electric polarization

    Tasuku Yoshida, Jun Kano, Masaichiro Mizumaki, Yusuke Tamenori, Kiyofumi Nitta, Kazuo Kato, Satoshi Hinokuma, Norihiro Oshime, Satoshi Hirose, Hitoshi Mikami, Naoshi Ikeda, Tatsuo Fujii, Yuta Nishina, Tomoko Okubo

    Applied Physics Letters   119 ( 9 )   092904 - 092904   2021.8

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    DOI: 10.1063/5.0066289

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  • Single domain growth and charge ordering of epitaxial YbFe2O4 films

    Takumi Sakagami, Reika Ota, Jun Kano, Naoshi Ikeda, Tatsuo Fujii

    CRYSTENGCOMM   2021.8

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    DOI: 10.1039/d1ce00834j

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  • Light reflectance and photoelectron yield spectroscopy enable acceptor level measurement in p-type Ba1-xTiO3 semiconductor

    Saya Fujii, Jun Kano, Norihiro Oshime, Tohru Higuchi, Yuta Nishina, Tatsuo Fujii, Naoshi Ikeda, Hiromi Ota

    JOURNAL OF APPLIED PHYSICS   129 ( 8 )   2021.2

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    DOI: 10.1063/5.0033761

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  • Chemical reaction between lead-free multicomponent alkali borosilicate glass frit and hematite during heat treatment

    Hideki Hashimoto, Akane Terasawa, Hirofumi Inada, Taigo Takaishi, Tatsuo Fujii, Hidetaka Asoh

    JOURNAL OF THE EUROPEAN CERAMIC SOCIETY   41 ( 1 )   823 - 830   2021.1

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    DOI: 10.1016/j.jeurceramsoc.2020.08.037

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  • Skewed electronic band structure induced by electric polarization in ferroelectric BaTiO3

    Norihiro Oshime, Jun Kano, Eiji Ikenaga, Shintaro Yasui, Yosuke Hamasaki, Sou Yasuhara, Satoshi Hinokuma, Naoshi Ikeda, Pierre-Eymeric Janolin, Jean-Michel Kiat, Mitsuru Itoh, Takayoshi Yokoya, Tatsuo Fujii, Akira Yasui, Hitoshi Osawa

    SCIENTIFIC REPORTS   10 ( 1 )   2020.7

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    DOI: 10.1038/s41598-020-67651-w

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  • Bright Yellowish-Red Pigment Based on Hematite/Alumina Composites with a Unique Porous Disk-like Structure

    Hideki Hashimoto, Jun Kiyohara, Arisa Isozaki, Yuya Arakawa, Tatsuo Fujii, Jun Takada, Hirofumi Inada, Taigo Takaishi, Hidetaka Asoh

    ACS OMEGA   5 ( 8 )   4330 - 4337   2020.3

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    DOI: 10.1021/acsomega.9b04297

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  • Intermittent parathyroid hormone 1–34 induces oxidation and deterioration of mineral and collagen quality in newly formed mandibular bone Reviewed

    Yohsuke Yoshioka, Eiki Yamachika, Makoto Nakanishi, Tadashi Ninomiya, Sho Akashi, Sei Kondo, Norifumi Moritani, Yasuhiro Kobayashi, Tatsuo Fujii, Seiji Iida

    Scientific Reports   9 ( 1 )   8041   2019.12

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    Abstract

    Intermittent parathyroid hormone (PTH) administration is known to promote bone healing after surgical procedures. However, the mechanism and influence of PTH on the mineral and collagen quality of the jaw are not well understood. Most studies have focused on analyzing the bone density and microstructure of the mandible, and have insufficiently investigated its mineral and collagen quality. Oxidative stress activates osteoclasts, produces advanced glycation end products, and worsens mineral and collagen quality. We hypothesized that PTH induces oxidation and affects the mineral and collagen quality of newly formed mandibular bone. To test this, we examined the mineral and collagen quality of newly formed mandibular bone in rats administered PTH, and analyzed serum after intermittent PTH administration to examine the degree of oxidation. PTH administration reduced mineralization and worsened mineral and collagen quality in newly formed bone. In addition, total anti-oxidant capacity in serum was significantly decreased and the oxidative-INDEX was increased among PTH-treated compared to vehicle-treated rats, indicating serum oxidation. In conclusion, intermittent administration of PTH reduced mineral and collagen quality in newly formed mandibular bone. This effect may have been induced by oxidation.

    DOI: 10.1038/s41598-019-44389-8

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    Other Link: http://www.nature.com/articles/s41598-019-44389-8

  • 青色無機顔料コバルトブルーの色調におよぼすコバルト原料化合物の影響 Reviewed

    米田 美佳, 辰己 祐哉, 三野 泰志, 中曽 浩一, 後藤 邦彰, 中西 真, 藤井 達生, 小西 康裕, 野村 俊之

    粉体工学会誌   56 ( 8 )   446 - 451   2019.8

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  • In situ Mossbauer analysis of bacterial iron-oxide nano-particles for lithium-ion battery

    Ryo Sakuma, Hideki Hashimoto, Tatsuo Fujii, Jun Takada, Naoaki Hayashi, Mikio Takano

    HYPERFINE INTERACTIONS   240 ( 1 )   2019.8

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    DOI: 10.1007/s10751-019-1639-y

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  • Solid-state synthesis and characterization of cobalt blue core-shell pigment particles

    Mika Yoneda, Kuniaki Gotoh, Makoto Nakanishi, Tatsuo Fujii, Yasuhiro Konishi, Toshiyuki Nomura

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   102 ( 6 )   3468 - 3476   2019.6

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    DOI: 10.1111/jace.16191

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  • Bright greenish-yellow pigments based on Sc2-xFexO3 solid solutions with bixbyite structure

    Hideki Hashimoto, Kotaro Sayo, Hidetaka Asoh, Tatsuo Fujii, Mikio Takano, Atsunobu Masuno

    MATERIALS RESEARCH BULLETIN   109   190 - 194   2019.1

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    DOI: 10.1016/j.materresbull.2018.09.035

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  • Influence of cobalt source compounds on the color tone of cobalt blue inorganic pigment

    Mika Yoneda, Yuya Tatsumi, Yasushi Mino, Koichi Nakaso, Kuniaki Gotoh, Makoto Nakanishi, Tatsuo Fujii, Yasuhiro Konishi, Toshiyuki Nomura

    Journal of the Society of Powder Technology, Japan   56 ( 8 )   446 - 451   2019

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    DOI: 10.4164/sptj.56.446

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  • Cathepsin K inhibitor causes changes in crystallinity and crystal structure of newly-formed mandibular bone in rats Reviewed International journal

    Y. Yoshioka, E. Yamachika, M. Nakanishi, T. Ninomiya, K. Nakatsuji, Y. Kobayashi, T. Fujii, S. Iida

    British Journal of Oral and Maxillofacial Surgery   56 ( 8 )   732 - 738   2018.10

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    Cathepsin K inhibitors are new drugs with the potential for the treatment of osteoporosis because they sustain bony remodelling better than bone resorption inhibitors such as bisphosphonates. The treatment of osteoporosis with inhibitors of bony resorption is associated with osteonecrosis of the jaw, as the deterioration in bony quality that they induce is thought to be one of its causes. The quality of bone is delineated by structural and material characteristics (which include the degree and quality of mineralisation, and depends on the content of proteoglycan and the structural integrity of the bony collagen).1,2 Animal and clinical studies have shown that cathepsin K inhibitors improve the mineral density and structural characteristics of bone, but their effect on the rest remains unknown. We therefore hypothesised that these inhibitors will affect the material characteristics of newly-formed mandibular bone. To verify our hypothesis, we used Raman microspectroscopy to examine such bone in rats that were given a cathepsin K inhibitor, and found unusual crystallinity and an increased substitution of carbonate (CO32-) in its crystal structure.

    DOI: 10.1016/j.bjoms.2018.08.003

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  • Preparation of epitaxial Fe3-xTixO4 solid solution films by sputtering method Reviewed

    Kazuhiro Nishimura, Masahiro Kitazono, Makoto Nakanishi, Tatsuo Fujii

    Journal of the Japan Society of Powder and Powder Metallurgy   65 ( 9 )   585 - 588   2018.9

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    DOI: 10.2497/jjspm.65.585

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  • Molecular alterations of newly formed mandibular bone caused by zoledronate International journal

    Y. Yoshioka, E. Yamachika, M. Nakanishi, T. Ninomiya, K. Nakatsuji, M. Matsubara, N. Moritani, Y. Kobayashi, T. Fujii, S. Iida

    International Journal of Oral and Maxillofacial Surgery   47 ( 9 )   1206 - 1213   2018.9

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    Bone quality is defined by structural and material characteristics. Most studies on the mandible have focused on the analysis of structural characteristics, with insufficient investigation of material characteristics. This study tested whether zoledronate affects the material characteristics of newly formed mandibular bone. Thirty-six female Wistar rats were assigned to three groups: sham-ovariectomized rats (SHAM, n=12), ovariectomized rats (OVX, n=12), and ovariectomized rats treated with zoledronate (ZOL, n=12). The left side of the mandibular ramus of all rats was drilled bicortically. Twenty-eight days after surgery, all surviving rats were euthanized and all mandibles were removed. Raman microspectroscopy was performed, and five spectra per specimen of newly formed mandibular bone were analysed. Compared with OVX rats, the mineral/matrix ratio in ZOL rats was significantly increased (5.43±1.88 vs. 7.86±2.05), while crystallinity (0.055±0.002 vs. 0.050±0.002), relative proteoglycan content (0.43±0.10 vs. 0.31±0.05), and collagen structural integrity (1.16±0.21 vs. 0.72±0.06) were significantly decreased. These changes in material characteristics may explain why rats that received zoledronate exhibited peculiar biological phenomena such as bisphosphonate-related osteonecrosis of the jaw.

    DOI: 10.1016/j.ijom.2018.02.002

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  • Cuticle network and orientation preference of photonic crystals in the scales of the weevil Lamprocyphus augustus

    R. Ebihara, H. Hashimoto, J. Kano, T. Fujii, S. Yoshioka

    Journal of The Royal Society Interface   15 ( 145 )   20180360 - 20180360   2018.8

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    This paper reports the structural and optical investigations of the structural colour of the weevil
    <italic>Lamprocyphus</italic>
    <italic>augustus</italic>
    . The photonic crystal structure within the weevil's scales was investigated using sequential focused ion-beam milling and scanning electron microscopy imaging. We carefully analysed the reconstructed three-dimensional structure to determine the unit cell of the photonic crystal. It was found that the cuticle network of the cubic unit cell perfectly matches the previously reported diamond-based network. However, different results were obtained for the crystal orientations of the small crystal domains that comprise the entire photonic crystal structure in the scales:
    <monospace>&lt;111&gt;</monospace>
    directions are highly preferred along the surface normal of the scale. This finding explains the fact that the scale is almost uniformly coloured despite the multi-domain structure. It is confirmed experimentally and theoretically that the wavelength range of the reflection band corresponds to the gap of the photonic band.

    DOI: 10.1098/rsif.2018.0360

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    Other Link: https://royalsocietypublishing.org/doi/full-xml/10.1098/rsif.2018.0360

  • Core-level binding-energy of BaTiO3 with pre- and post-application of electric field

    Oshime N., Itoh M., Fujii T., Yasui A., Kano J., Ikenaga E., Yasui S., Hinokuma S., Ikeda N., Hamasaki Y., Yasuhara S., Yokoya T.

    Meeting Abstracts of the Physical Society of Japan   73   2571 - 2571   2018

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    Language:Japanese   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.73.1.0_2571

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  • Electronic states modulated by electric polarization in ferroelectric BaTiO3

    Oshime N., Itoh M., Fujii T., Yasui A., Kano J., Ikenaga E., Yasui S., Hinokuma S., Ikeda N., Hamasaki Y., Yasuhara S., Yokoya T.

    Meeting Abstracts of the Physical Society of Japan   72   2307 - 2307   2017

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    DOI: 10.11316/jpsgaiyo.72.2.0_2307

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  • 21aAF-3 Effect of ion vacant on band structure in BaTiO_3

    Oshime N., Kano J., Ikeda N., Teranishi T., Osaki K., Fujii T., Ueda T., Ohkubo T.

    Meeting Abstracts of the Physical Society of Japan   71   2691 - 2691   2016

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    DOI: 10.11316/jpsgaiyo.71.1.0_2691

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  • 21aPS-115 Catalysis on Metal-ferroelectric Junction

    Jyuna T., Kano J., Ikeda N., Fujii T., Ohkubo T.

    Meeting Abstracts of the Physical Society of Japan   71   2708 - 2708   2016

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    DOI: 10.11316/jpsgaiyo.71.1.0_2708

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  • Quantitative study of band structure in iron oxides

    Oshime N., Kano J., Okamoto T., Ikeda N., fujii T.

    Meeting Abstracts of the Physical Society of Japan   71   2545 - 2545   2016

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    DOI: 10.11316/jpsgaiyo.71.2.0_2545

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  • Dielectric property of Mn doped Yb2Fe3O7 single crystal

    Karasudani T., Fujiwara K., Fujii T., Todori K., Fukunaga M., Horibe Y., Kano J., Ikeda N.

    Meeting Abstracts of the Physical Society of Japan   71   2543 - 2543   2016

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    DOI: 10.11316/jpsgaiyo.71.2.0_2543

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

    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

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    DOI: 10.1149/2.0041512eel

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  • 21pCJ-7 Mg-doping effects in Ba_<0.8>Sr_<0.2>TiO_3

    Oshime N., Kano J., Osaki K., Teranishi T., Yoshida T., Ikeda N., Fujii T., Ohkubo T., Ueda T.

    Meeting Abstracts of the Physical Society of Japan   70   2704 - 2704   2015

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    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    DOI: 10.11316/jpsgaiyo.70.1.0_2704

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  • 22pCH-13 Catalysis in metal-ferroelectric junctions

    Kano J., Ikeda N., Oshime N., Fujii T., Hashimoto H., Teranishi T., Ohkubo T., Ueda T., Yoshida T., Akiyama Y.

    Meeting Abstracts of the Physical Society of Japan   70   2743 - 2743   2015

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    DOI: 10.11316/jpsgaiyo.70.1.0_2743

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

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

    APPLIED PHYSICS LETTERS   105 ( 14 )   2014.10

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    DOI: 10.1063/1.4898006

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  • Mossbauer spectrum of high-pressure synthesized ilmenite-type FeGeO3 Reviewed

    T. Fujii, D. Nakatsuka, M. Nakanishi, J. Takada, T. Yoshino

    HYPERFINE INTERACTIONS   226 ( 1-3 )   275 - 280   2014.4

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    DOI: 10.1007/s10751-014-1014-y

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    Other Link: http://orcid.org/0000-0002-5422-7396

  • Characterization of Ancient Red Iron Oxides Excavated from the Shimo-ohgibaru Archaeological Site in Kumamoto, Japan Reviewed

    TSUJI Hiromi, MURAKAMI Ryu, MIYAZAKI Takashi, HASHIMOTO Hideki, DANNO Teruaki, KUSANO Yoshihiro, KIKUCHI Takahiro, NAKANISHI Makoto, FUJII Tatsuo, TAKADA Jun

    J. Jpn. Soc. Powder Powder Metallurgy   60 ( 4 )   146 - 153   2013

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Powder and Powder Metallurgy  

    To clarify the detailed features of the red bengala samples excavated from the Shimo-ohgibaru archaeological site in the late Yayoi period (2nd to 3rd century A.D.) from the viewpoint of materials science, colorimetric measurements, X-ray fluorescence analyses, X-ray diffraction measurements, transmission electron microscope observations, and surface area measurements of the ancient bengala samples were achieved. The ancient bengala sample was found to be high purity α - Fe2O3. The features of the color tone and particle size of the ancient bengala were clarified by comparing with those of commercially available bengala, Fukiya bengala, and synthesized α-Fe2O3. In addition, the starting materials and synthesis processes of the ancient bengala were discussed by applying the elutriation experiments of representative natural hematite and heat-treated natural iron hydroxide (Oniita).

    DOI: 10.2497/jjspm.60.146

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  • Crystal and Fine Structural Transformations of Heat-Treated Biogenic Manganese Oxide Reviewed

    木村倫康, 橋本英樹, 宮田直幸, 仁科勇太, 草野圭弘, 池田靖訓, 中西真, 藤井達生, IVO Safarik, IVO Safarik, MIRKA Safarikova, 高田潤

    粉体および粉末冶金   60 ( 3 )   92-99 (J-STAGE) - 99   2013

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    In the natural aquatic environment, there are various types of biogenic manganese oxide (BMO) precipitates which are produced by manganese oxidizing microorganisms, at ambient temperature, atmosphere and neutral pH.BMO is a very interesting and useful functional material because of its unique property; hollow globule shape formed by nanosheets, large surface area and photocatalytic characteristics. In this study, thermally-processed BMO at 100 − 1000 °C was analyzed by XRD, XANES, SEM, TEM and nitrogen adsorption method to reveal the effects of heat-treatment on its crystal structure, Mn valence state, globule morphology, microstructure, pore size distribution and specific surface area. In the result, morphology of BMO is maintained below 800 °C, while nanosheets composing BMO were changed into nanoparticles at 600 °C. The crystal structure was transformed from birnessite into hausmannite (Mn3O4) at 600 °C. The specific surface area was increased by heat-treatment between 300 and 500 °C. In cases of artificial manganese oxides, such changes of crystal structure and specific surface area were not observed, and combustion of organic materials produced by microorganisms in BMO probably has a large effect on them.

    DOI: 10.2497/jjspm.60.92

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  • Synthesis of the Sr3Zn2Fe24O41 Z-type ferriteby polymerizable complex method

    Takuya Tainaka, Takeyuki Kikuchi, Tatsuya Nakamura, Tohru Yamasaki, Makoto Nakanishi, Tatsuo Fujii, Jun Takada, Yasunori Ikeda

    ELECTROCERAMICS IN JAPAN XV   566   231 - 234   2013

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    DOI: 10.4028/www.scientific.net/KEM.566.231

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  • Synthesis of U-type strontium hexaferrite by polymerizable complex method

    Takeyuki Kikuchi, Shinji Yoshida, Tatsuya Nakamura, Tohru Yamasaki, Makoto Nakanishi, Tatsuo Fujii, Jun Takada, Yasunori Ikeda

    ELECTROCERAMICS IN JAPAN XV   566   227 - 230   2013

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    DOI: 10.4028/www.scientific.net/KEM.566.227

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  • Preparation, microstructure, and color tone of microtubule material composed of hematite/amorphous-silicate nanocomposite from iron oxide of bacterial origin Reviewed

    Hideki Hashimoto, Hiroshi Asaoka, Takuya Nakano, Yoshihiro Kusano, Hiromichi Ishihara, Yasunori Ikeda, Makoto Nakanishi, Tatsuo Fujii, Tadanori Yokoyama, Nanao Horiishi, Tokuro Nanba, Jun Takada

    DYES AND PIGMENTS   95 ( 3 )   639 - 643   2012.12

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    DOI: 10.1016/j.dyepig.2012.06.024

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  • Formation Mechanism of a Bixbyite β-Fe_2O_3 Reviewed

    DANNO Teruaki, KUSANO Yoshihiro, ASAOKA Hiroshi, NAKANISHI Makoto, FUJII Tatsuo, IKEDA Yasunori, TAKADA Jun

    J. Jpn. Soc. Powder Powder Metallurgy   58 ( 9 )   529 - 534   2012.9

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    Formation mechanism of β-Fe2O3 particles was investigated by controlling the preparation conditions such as the mixing ratio of NaFe(SO4)2 and Na3Fe(SO4)3 to NaCl and the heat treatment temperature. The heat treatment temperature strongly affected the particle shapes and sizes. β-Fe2O3 was found to be formed by two different reactions; one is a solid state reaction below 490 °C, and another is a liquid phase-mediated reaction above 490 °C. β-Fe2O3 had granular shape with a diameter of about 50 to 100 nm below 490 °C, while at high temperatures above 490 °C cubic particles with relatively large size of about 500 nm to 2 μm were produced. We found that this dramatically change of particle morphology including their sizes and shapes was caused by the effects of the liquid phase in the reaction.

    DOI: 10.2497/jjspm.58.529

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  • Formation and superparamagnetic behaviors of LaFeO3 nanoparticles Reviewed

    Tatsuo Fujii, Ikkoh Matsusue, Makoto Nakanishi, Jun Takada

    HYPERFINE INTERACTIONS   205 ( 1-3 )   97 - 100   2012.3

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    DOI: 10.1007/s10751-011-0423-4

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  • Synthesis of La-Co Substituted M-type Calcium Hexaferrite by Polymerizable Complex Method Reviewed

    T. Kikuchi, T. Nakamura, T. Yamasaki, M. Nakanishi, T. Fujii, J. Takada, Y. Ikeda

    3RD INTERNATIONAL CONGRESS ON CERAMICS (ICC3): ADVANCES IN ELECTRO CERAMICS   18   2011

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    DOI: 10.1088/1757-899X/18/9/092040

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  • Formation mechanism of nano-crystalline β-Fe<inf>2</inf>O<inf>3</inf> particles with bixbyite structure and their magnetic properties Reviewed

    T. Danno, H. Asaoka, M. Nakanishi, T. Fujii, Y. Ikeda, Y. Kusano, J. Takada

    Journal of Physics: Conference Series   200 ( SECTION 8 )   2010

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    DOI: 10.1088/1742-6596/200/8/082003

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  • Synthesis of Ge substituted ilmenite and their magnetic and electronic properties Reviewed

    D. Nakatsuka, T. Fujii, M. Nakanishi, J. Takada

    Journal of Physics: Conference Series   200 ( SECTION 1 )   2010

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    DOI: 10.1088/1742-6596/200/1/012144

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  • Microstructure and formation process of reddish color pattern hidasuki on bizen stoneware

    Yoshihiro Kusano, Minoru Fukuhara, Tatsuo Fujii, Jun Takada, Akira Doi, Yasunori Ikeda, Mikio Takano

    ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES   64   C165 - C165   2008

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  • 27pTE-9 Magnetic polarization of Ti^<4+> ions in Fe_<2-x>Ti_xO_3 solid solution system Reviewed

    Fujii T., Yamashita M., Fujimori S., Saitoh Y., Nakamura T., Kobayashi K., Takada J.

    Meeting Abstracts of the Physical Society of Japan   61 ( 0 )   435 - 435   2006

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    DOI: 10.11316/jpsgaiyo.61.1.3.0_435_1

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  • Magnetic and electronic properties of Fe<inf>1.2</inf>Ti <inf>0.8</inf>O<inf>3</inf>/Fe<inf>2</inf>O<inf>3</inf> bilayered films

    Tatsuo Fujii, Yusuke Takada, Makoto Nakanishi, Jun Takada

    INTERMAG ASIA 2005: Digests of the IEEE International Magnetics Conference   728   2005

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  • Preparation and magnetic property of Y-type hexagonal ferrite's films Reviewed

    K Komatsu, M Nakanishi, T Fujii, J Takkada

    NINTH INTERNATIONAL CONFERENCE ON FERRITES (ICF-9)   759 - 762   2005

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  • Preparation and characterization of alpha-Fe2O3/FeTiO3 multi-layered films Reviewed

    T Fujii, Y Takada, M Nakanishi, J Takada

    NINTH INTERNATIONAL CONFERENCE ON FERRITES (ICF-9)   207 - 213   2005

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  • Preparation and characterization of al-substituted hematite and their tone color Reviewed

    H Asaoka, M Nakanishi, T Fujii, J Takada, R Murakami

    NINTH INTERNATIONAL CONFERENCE ON FERRITES (ICF-9)   69 - 73   2005

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  • Magnetic properties of La-Co substituted M-type Sr ferrite ultra fine powders prepared from the citrate precursors Reviewed

    T Kikuchi, T Nakamura, M Nakanishi, T Fujii, J Takada, Y Ikeda, M Nakamura, M Miki

    NINTH INTERNATIONAL CONFERENCE ON FERRITES (ICF-9)   75 - 80   2005

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  • Low temperature synthesis of Sr and Ba M-type ferrites by polymerized complex method Reviewed

    T. Kikuchi, T. Nakamura, M. Nakanishi, T. Fujii, J. Takada, Y. Ikeda, M. Nakamura, M. Miki

    Trans Mater Res Soc Jpn   29   2305 - 2308   2004

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    Synthesis and magnetic properties of M-type hexagonal ferrites with chemical composition of AFe12O19 (A = Ba and Sr) were studied. Nitrates of barium, strontium and iron were used as starting materials. The precursor of M-type ferrites was prepared mainly by the polymerization of metal-citric complex with various amounts of ethylene glycol, and heating the gel at 300 oC. The precursor was ground, pressed by uniaxial compression in a die and heated at 750-950 oC in air. From these results, large coercive force of the samples in this study is probably caused by achievement of small grain size under the single domain size by polymerized complex method.

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  • Reproduction of Japanese traditional pigment based on iron oxide powders with yellowish red color Reviewed

    Hiroshi Asaoka, Makoto Nakanishi, Tatsuo Fujii, Jun Takada, Yoshihiro Kusano, Ryu Murakami

    Materials Research Society Symposium - Proceedings   712   435 - 440   2002

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    DOI: 10.1557/proc-712-ii8.2

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  • NO<inf>2</inf>-assisted molecular-beam epitaxy of wustitelike and magnetitelike Fe oxynitride films on MgO(100)

    F. C. Voogt, P. J. Smulders, G. H. Wijnja, L. Niesen, T. Fujii, M. A. James, T. Hibma

    Physical Review B - Condensed Matter and Materials Physics   63 ( 12 )   1254091 - 12540911   2001

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    DOI: 10.1103/physrevb.63.125409

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  • Introduction of flux pinning center in sintered Bi-2223 superconductors by 290 MeV/n 40Ar irradiation

    Takeyuki Kikuchi, Makoto Nakanishi, Masahiro Nagae, Yoshihiro Kusano, Tatsuo Fujii, Jun Takada, Nakahiro Yasuda, Takeshi Murakami

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   46 ( 9 )   994 - 998   1999.9

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    DOI: 10.2497/jjspm.46.994

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  • In situXPS analysis of various iron oxide films grown byNO2-assisted molecular-beam epitaxy

    T. Fujii, F. M. F. de Groot, G. A. Sawatzky, F. C. Voogt, T. Hibma, K. Okada

    Physical Review B   59 ( 4 )   3195 - 3202   1999.1

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    DOI: 10.1103/physrevb.59.3195

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  • Preparation and properties of a novel electromagnetic wave absorber ferrite/SiC sintered composite Reviewed

    T. Jun, M. Nakanishi, M.Yoshino, T. Fujii, Tatsuo, M. Fukuhara, A. Doi, Y. Kusano

    Adv. Powder Metall. Part. Mater.   3   11 - 19   1999

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  • MBE-growth of iron and iron oxide thin films on MgO(100), using NO<inf>2</inf>, NO, and N<inf>2</inf>O as oxidizing agents

    F. C. Voogt, T. Hibma, P. J.M. Smulders, L. Niesen, T. Fujii

    Materials Research Society Symposium - Proceedings   477   211 - 216   1997

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  • Microstructure of Co Ferrite Films and Co Ferrite/zn Ferrite Double Layered Films Prepared by Plasma Enhanced MOCVD

    Eiji Fujii, Hideo Torii, Masumi Hattori, Tatsuo Fujii, Kiyoshi Kuribayashi, Miyoshi Inoue

    Journal of the Japan Society of Powder and Powder Metallurgy   40 ( 6 )   618 - 622   1993

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    DOI: 10.2497/jjspm.40.618

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  • Raman Spectra and Constitution of Binary Tellurite Glasses Containing Typical Network Modifying Cations

    Akiyoshi Osaka, Qiu Jianrong, Tatsuo Fujii, Tokuro Nanba, Jun Takada, Yoshinari Miura

    Journal of the Society of Materials Science, Japan   42 ( 476 )   473 - 477   1993

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    DOI: 10.2472/jsms.42.473

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  • Microstructure of Hydroxyapatite-Hematite Composite Particles Prepared by Ultrasonic Spray Pyrolysis

    Osaka Akiyoshi, Chiba Akira, Fujii Tatsuo, Nanba Tokuro, Takada Jun, Miura Yoshinari

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   39 ( 3 )   239 - 242   1992

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    DOI: 10.2497/jjspm.39.239

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  • Cryogenic resonance-electron Mössbauer spectroscopy with a helium-filled proportional counter

    R. Katano, T. Fujii, T. Kobayashi, K. Fukumura, Y. Isozumi

    Nuclear Inst. and Methods in Physics Research, A   280 ( 2-3 )   285 - 287   1989.8

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    DOI: 10.1016/0168-9002(89)90918-2

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Books

  • エレクトロニクス用セラミックスの開発、評価手法と応用

    技術情報協会( Role: Contributor ,  酸化鉄系高周波磁性体薄膜材料の開発)

    技術情報協会  2020.8  ( ISBN:9784861047985

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  • 先端部材への応用に向けた最新粉体プロセス技術

    シーエムシー出版  2017 

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  • 電磁波吸収・シールド材料の設計、評価技術と最新ノイズ対策

    技術情報協会  2016  ( ISBN:9784861046

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  • Resonance-electron Mossbauer spectroscopy at low and high temperatures

    Current Topics in Crystal Growth Research (Reseach Trends, India) 

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MISC

  • 酸化物に接合された金属薄膜への分子吸着挙動

    狩野旬, 押目典宏, 廣瀬哲, 上田剛慈, 安井伸太郎, 浜嵜容丞, 伊藤満, 三上仁志, 池田直, 藤井達生, 柏原浩大, SCHNEIDER Julien

    日本物理学会講演概要集(CD-ROM)   74 ( 2 )   2019

  • 金属-酸化物薄膜接合系におけるエネルギーバンドアライメント

    狩野旬, 押目典宏, 廣瀬哲, 上田剛慈, 安井伸太郎, 浜嵜容丞, 伊藤満, 三上仁志, 池田直, 藤井達生, 柏原浩大, SCHNEIDER Julien

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)   80th   2019

  • Interaction between lead-free multicomponent alkali borosilicate glass frits and hematite in red overglaze enamels

    Hirofumi Inada, Yuki Okazaki, Tadanori Yokoyama, Taigo Takaishi, Tatsuo Fujii, Jun Takada, Hidetaka Asoh, Hideki Hashimoto

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   101 ( 10 )   4538 - 4548   2018.10

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  • Frustrated Magnetism of Pharmacosiderite Comprising Tetrahedral Clusters Arranged in the Primitive Cubic Lattice

    Ryutaro Okuma, Takeshi Yajima, Tatsuo Fujii, Mikio Takano, Zenji Hiroi

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   87 ( 9 )   093702   2018.9

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  • Alchemy in the Art of Traditional Japanese Ceramics: Microstructure and Formation Mechanism of Gold-Colored Bizen Stoneware

    Yoshihiro Kusano, Minoru Fukuhara, Taichi Fujino, Tatsuo Fujii, Jun Takada, Mikio Takano

    CRYSTAL GROWTH & DESIGN   18 ( 7 )   4017 - 4021   2018.7

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  • Pd触媒のNO‐CO反応における担体効果

    重名智博, 狩野旬, 藤井達生, 森茂生, 池田直

    日本物理学会講演概要集(CD-ROM)   73 ( 1 )   ROMBUNNO.22pPSB‐75   2018.3

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  • Biosynthesis of Schwertmannite and Goethite in a Bioreactor with Acidophilic Fe(II)-Oxidizing Betaproteobacterium Strain GJ-E10

    Naoyuki Miyata, Ayato Takahashi, Tatsuo Fujii, Hideki Hashimoto, Jun Takada

    MINERALS   8 ( 3 )   98   2018.3

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  • Influence of aluminum source on the color tone of cobalt blue pigment

    Mika Yoneda, Iuniaki Gotoh, Makoto Nakanishi, Tatsuo Fujii, Toshiyuki Nomura

    POWDER TECHNOLOGY   323   574 - 580   2018.1

  • Growth and charge ordering of epitaxial YbFe2O4 films on sapphire using Fe3O4 buffer layer

    Tatsuo Fujii, Tomoya Numata, Hiroki Nakahata, Makoto Nakanishi, Jun Kano, Naoshi Ikeda

    JAPANESE JOURNAL OF APPLIED PHYSICS   57 ( 1 )   010305   2018.1

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  • 強誘電体BaTiO3薄膜の分極反転時における電子構造変化

    押目典宏, 狩野旬, 池永英司, 安井伸太郎, 日隈聡士, 池田直, 浜嵜容丞, 安原颯, 横谷尚睦, 伊藤満, 藤井達生, 保井晃, 大沢仁志

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

  • 分極効果で変調される強誘電体BaTiO3薄膜の電子構造

    押目典宏, 狩野旬, 狩野旬, 池永英司, 安井伸太郎, 日隈聡士, 池田直, 浜嵜容丞, 安原颯, 横谷尚睦, 伊藤満, 藤井達生, 保井晃

    日本セラミックス協会年会講演予稿集(CD-ROM)   2018   2018

  • Synthesis and magnetic properties of Li,Al-substituted Y-Type ferrite

    Makoto Nakanishi, Saori Ono, Tatsuo Fujii, Takeyuki Kikuchi

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   64 ( 7 )   378 - 382   2017.7

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    DOI: 10.2497/jjspm.64.378

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  • Effect of dispersion and aggregation of wet-synthesized Al-substituted hematite particles on color tone of powders and red overglaze enamels

    Hirofumi Inada, Yuki Okazaki, Yuya Arakawa, Taigo Takaishi, Tatsuo Fujii, Jun Takada, Hidetaka Asoh, Hideki Hashimoto

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   125 ( 5 )   S1 - S7   2017.5

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  • Effect of dispersion and aggregation of wet-synthesized Al-substituted hematite particles on color tone of powders and red overglaze enamels

    Hirofumi Inada, Yuki Okazaki, Yuya Arakawa, Taigo Takaishi, Tatsuo Fujii, Jun Takada, Hidetaka Asoh, Hideki Hashimoto

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   125 ( 5 )   S1 - S7   2017.5

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  • Mossbauer study of zinc-substituted strontium cobalt Z-type hexaferrite

    Takeyuki Kikuchi, Masafumi Kobune, Makoto Nakanishi, Tatsuo Fujii

    CERAMICS INTERNATIONAL   43   S386 - S390   2017

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  • Direct observation of band bending structure on ferroelectric BaTiO3

    Oshime N, Kano J, Ikenaga E, Yasui S, Hinokuma S, Ikeda N, Yokoya T, Fujii T

    Meeting Abstracts of the Physical Society of Japan   72 ( 0 )   2725 - 2725   2017

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    &lt;p&gt;自発分極は試料内部の静電ポテンシャルを傾斜させる。強誘電体の原子軌道エネルギーはこの傾斜に応じて系統的に変化すると考えられる。この現象はバンドベンディングと呼ばれ40年以上に渡り予想されてきた。今回,BaTiO_3_においてバンドベンディング現象を直接的に観測したので報告する。本研究において得られた実験結果は,エピタキシャル製膜された強誘電体薄膜試料と深さ分解光電子分光実験を組み合わせることで初めて達成できた。&lt;/p&gt;

    DOI: 10.11316/jpsgaiyo.72.1.0_2725

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  • Unusual valence change of metal nanoparticles on the ferroelectric II

    Yoshida T, Fujii T, Ohkubo T, Ueda T, Kano J, Mizumaki M, Nitta K, Kato K, Hinokuma H, Oshime N, Ikeda N

    Meeting Abstracts of the Physical Society of Japan   72 ( 0 )   2724 - 2724   2017

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    &lt;p&gt;強誘電体に金属ナノ粒子を接合させると強誘電体の分極により金属の電子状態が変調すると考えられる。電子状態変化が触媒作用に影響することが示唆されているが、電子状態異常の直接的な観測例はない。今回、強誘電体BaTiO_3_表面に担持したPdO_x_ナノ粒子に対してX線吸収微細構造(XAFS)測定を行い、粒子表面で異常な価数状態をとることを見出した、またその発現機構についての考察を行ったので報告する。&lt;/p&gt;

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  • 好酸性鉄酸化細菌を利用した鉱山廃水処理および機能性酸化鉄の生産

    宮田直幸, 東條ふゆみ, 藤井達生, 高田潤, 高田潤

    日本水環境学会年会講演集   51st   2017

  • BaTiO3のバンドベンディング構造

    押目典宏, 狩野旬, 狩野旬, 池永英司, 安井伸太郎, 日隈聡士, 池田直, 浜嵜容丞, 安原颯, 横谷尚睦, 伊藤満, 藤井達生, 保井晃

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)   78th   2017

  • Bio-inspired 2-line ferrihydrite as a high-capacity and high-rate-capability anode material for lithium-ion batteries

    Hideki Hashimoto, Masahiro Ukita, Ryo Sakuma, Makoto Nakanishi, Tatsuo Fujii, Nobuyuki Imanishi, Jun Takada

    JOURNAL OF POWER SOURCES   328   503 - 509   2016.10

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

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

    JOURNAL OF APPLIED PHYSICS   120 ( 15 )   154101 - 6   2016.10

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  • Synthesis and characterization of cobalt blue pigment particles with core-shell structure for reducing the amount of cobalt usage

    54   18 - 22   2016.9

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  • Structural, magnetic and optical properties of YbFe2O4 films deposited by spin coating

    Tatsuo Fujii, Naoya Okamura, Hideki Hashimoto, Makoto Nakanishi, Jun Kano, Naoshi Ikeda

    AIP ADVANCES   6 ( 8 )   085213-8   2016.8

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  • Controlling the Color of Lead-Free Red Overglaze Enamels and a Process for Preparing High-Quality Red Paints

    Hideki Hashimoto, Hirofumi Inada, Yuki Okazaki, Taigo Takaishi, Tatsuo Fujii, Jun Takada

    ACS APPLIED MATERIALS & INTERFACES   8 ( 17 )   10918 - 10928   2016.5

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  • BaTiO3を担体としたパラジウム微粒子の価数状態

    吉田右, 狩野旬, 狩野旬, 押目典宏, 日隈聡士, 日隈聡士, 為則雄祐, 加藤和男, 新田清文, 水牧仁一朗, 池田直, 藤井達生, 大久保智子, 上田剛慈

    日本セラミックス協会年会講演予稿集(CD-ROM)   2016   ROMBUNNO.1P026   2016.3

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  • Mnをドープした(YbFe2O4)m(YbFeO3)n,m=1,n=1単結晶の磁性と誘電特性

    烏谷友之, 藤原孝将, 藤井達生, 戸取和大, 古林宏之, 福永守, 堀部陽一, 狩野旬, 狩野旬, 池田直

    日本物理学会講演概要集(CD-ROM)   71 ( 1 )   2016

  • 21aPS-116 Dielectric and magnetic property of Mn doped (YbFe_2O_4)_m(YbFeO_3)_n, m=1, n=1 single crystal

    Karasudani T., Fujiwara K., Fujii T., Todori K., Kobayashi H., Fukunaga M., Horibe Y., Kano J., Ikeda N.

    Meeting Abstracts of the Physical Society of Japan   71 ( 0 )   2709 - 2709   2016

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    DOI: 10.11316/jpsgaiyo.71.1.0_2709

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  • 18aPS-73 Unusual valence change of metal nanoparticles on the ferroelectric BaTiO_3

    吉田 右, 狩野 旬, 押目 典宏, 日隈 聡士, 加藤 和男, 新田 清文, 水牧 仁一朗, 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 ( 2 )   2505 - 2505   2015.9

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    DOI: 10.11316/jpsgaiyo.70.2.0_2505

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  • Microstructural properties of (11(2)over-bar 0)-oriented hematite-ilmenite solid solution films

    Tatsuo Fujii, Tomohiro Mino, Shunsuke Kanamaru, Makoto Nakanishi, Hideki Hashimoto, Jun Takada

    THIN SOLID FILMS   591   245 - 249   2015.9

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  • Lithium Storage Properties of a Bioinspired 2-Line Ferrihydrite: A Silicon-Doped, Nanometric, and Amorphous Iron'Oxyhydroxide

    Hideki Hashimoto, Yuta Nishiyama, Masahiro Ukita, Ryo Sakuma, Makoto Nakanishi, Tatsuo Fujii, Jun Takada

    INORGANIC CHEMISTRY   54 ( 15 )   7593 - 7599   2015.8

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  • Structural transformations of heat-treated bacterial iron oxide

    Hideki Hashimoto, Tatsuo Fujii, Shinji Kohara, Koji Nakanishi, Chihiro Yogi, Herwig Peterlik, Makoto Nakanishi, Jun Takada

    MATERIALS CHEMISTRY AND PHYSICS   155   67 - 75   2015.4

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  • High-rate performance of a bacterial iron-oxide electrode material for lithium-ion battery

    Ryo Sakuma, Hideki Hashimoto, Genki Kobayashi, Tatsuo Fujii, Makoto Nakanishi, Ryoji Kanno, Mikio Takano, Jun Takada

    MATERIALS LETTERS   139   414 - 417   2015.1

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  • 好酸性鉄酸化細菌GJ-E10株が形成する酸化鉄の金属イオン吸着特性

    宮田直幸, 土門ひかる, 東條ふゆみ, 藤井達生, 橋本英樹, 高田潤, 高田潤

    日本水処理生物学会誌 別巻   ( 35 )   2015

  • Preparation of Yellowish-Red Al-Substituted alpha-Fe2O3 Powders and Their Thermostability in Color

    Hideki Hashimoto, Makoto Nakanishi, Hiroshi Asaoka, Tomoaki Maeda, Yoshihiro Kusano, Tatsuo Fujii, Jun Takada

    ACS APPLIED MATERIALS & INTERFACES   6 ( 22 )   20282 - 20289   2014.11

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  • 8pAF-11 Band structure and post-annealing treatment of BaTiO_3

    Oshime N., Kano J., Fujii T, Ikeda N.

    Meeting abstracts of the Physical Society of Japan   69 ( 2 )   699 - 699   2014.8

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  • Bacterial Nanometric Amorphous Fe-Based Oxide: A Potential Lithium-Ion Battery Anode Material

    Hideki Hashimoto, Genki Kobayashi, Ryo Sakuma, Tatsuo Fujii, Naoaki Hayashi, Tomoko Suzuki, Ryoji Kanno, Mikio Takano, Jun Takada

    ACS APPLIED MATERIALS & INTERFACES   6 ( 8 )   5374 - 5378   2014.4

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  • 27pCE-8 Novel iron-based superconductor Ca_<10>(Ir_4As_8)(Fe_2As_2)_5 with square-planar Ir_4As_8 layers

    Kudo K., Mitsuoka D., Takasuga M., Sugiyama Y., Sugawara K., Katayama N., Sawa H., Kubo H., Takamori K., Ichioka M., Fujii T., Mizokawa T., Nohara M.

    Meeting abstracts of the Physical Society of Japan   69 ( 1 )   562 - 562   2014.3

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  • Characterization of microtubule material consisting of iron oxide nanoparticles produced by bacteria

    R. Sakuma, H. Hashimoto, Y. Kusano, Y. Ikeda, M. Nakanishi, T. Fujii, M. Takano, J. Takada

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   61 ( 1 )   S90 - S92   2014

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    DOI: 10.2497/jjspm.61.S90

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  • Preparation and electronic properties YbFe2O4 thin films by polymerized complex method

    N. Okamura, T. Fujii, J. Takada, M. Nakanishi, J. Kano, N. Ikeda

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   61   S327 - S329   2014

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    DOI: 10.2497/jjspm.61.S327

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  • Preparation, magnetic and electric properties of (110)-oriented ordered Fe2-xTixO3 thin films

    T. Matsumoto, N. Suzuki, S. Kanamaru, H. Hashimoto, M. Nakanishi, T. Fujii, J. Takada

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   61   S330 - S332   2014

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    DOI: 10.2497/jjspm.61.S330

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  • 固相反応法により合成したコバルトブルーの色調に及ぼす原料混合時間と焼成温度の影響

    米田美佳, 吉田幹生, 後藤邦彰, 辻広美, 中西真, 藤井達生, 野村俊之

    粉体工学会誌   51 ( 9 )   629 - 634   2014

  • 好酸性鉄酸化細菌による酸化鉄生成に及ぼす培養条件の影響

    宮田直幸, 高橋安弥人, 岡野邦宏, 尾崎保夫, 藤井達生, 橋本英樹, 高田潤

    日本水処理生物学会誌 別巻   ( 33 )   58   2013.10

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  • Superconductivity in Ca-10(Ir4As8)(Fe2As2)(5) with Square-Planar Coordination of Iridium

    Kazutaka Kudo, Daisuke Mitsuoka, Masaya Takasuga, Yuki Sugiyama, Kento Sugawara, Naoyuki Katayama, Hiroshi Sawa, Hiroaki S. Kubo, Kenta Takamori, Masanori Ichioka, Tatsuo Fujii, Takashi Mizokawa, Minoru Nohara

    SCIENTIFIC REPORTS   3   3101 - 5   2013.10

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  • Nano-Micrometer-Architectural Acidic Silica Prepared from Iron Oxide of Leptothrix ochracea Origin

    Hideki Hashimoto, Atsushi Itadani, Takayuki Kudoh, Satoshi Fukui, Yasushige Kuroda, Masaharu Seno, Yoshihiro Kusano, Yasunori Ikeda, Yasuhiko Benino, Tokuro Nanba, Makoto Nakanishi, Tatsuo Fujii, Jun Takada

    ACS APPLIED MATERIALS & INTERFACES   5 ( 11 )   5194 - 5200   2013.6

  • A novel route in the synthesis of magnetite nanoparticles

    Mira Ristic, Tatsuo Fujii, Hideki Hashimoto, Ivana Opacak, Svetozar Music

    MATERIALS LETTERS   100   93 - 97   2013.6

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  • Nano-micro-architectural composites with acid properties: Magnetic iron oxides/amorphous silicate prepared from iron oxide produced by iron-oxidizing bacterium, Leptothrix ochracea

    Hideki Hashimoto, Atsushi Itadani, Tatsuo Fujii, Makoto Nakanishi, Hiroshi Asaoka, Yoshihiro Kusano, Yasunori Ikeda, Yasushige Kuroda, Jun Takada

    MATERIALS RESEARCH BULLETIN   48 ( 3 )   1174 - 1177   2013.3

  • Acidic Amorphous Silica Prepared from Iron Oxide of Bacterial Origin

    Hideki Hashimoto, Atsushi Itadani, Takayuki Kudoh, Yasushige Kuroda, Masaharu Seno, Yoshihiro Kusano, Yasunori Ikeda, Makoto Nakanishi, Tatsuo Fujii, Jun Takada

    ACS APPLIED MATERIALS & INTERFACES   5 ( 3 )   518 - 523   2013.2

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  • Crystal Structure of beta-Fe2O3 and Topotactic Phase Transformation to alpha-Fe2O3

    Teruaki Danno, Daisuke Nakatsuka, Yoshihiro Kusano, Hiroshi Asaoka, Makoto Nakanishi, Tatsuo Fujii, Yasunori Ikeda, Jun Takada

    CRYSTAL GROWTH & DESIGN   13 ( 2 )   770 - 774   2013.2

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  • High-pressure synthesis, crystal structure and magnetic property of ilmenite-type FeGeO3

    Daisuke Nakatsuka, Takashi Yoshino, Jun Kano, Hideki Hashimoto, Makoto Nakanishi, Jun Takada, Tatsuo Fujii

    JOURNAL OF SOLID STATE CHEMISTRY   198   520 - 524   2013.2

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  • Amorphous structure of iron oxide of bacterial origin

    Hideki Hashimoto, Tatsuo Fujii, Shinji Kohara, Hiroshi Asaoka, Yoshihiro Kusano, Yasunori Ikeda, Makoto Nakanishi, Yasuhiko Benino, Tokuro Nanba, Jun Takada

    MATERIALS CHEMISTRY AND PHYSICS   137 ( 2 )   571 - 575   2012.12

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  • Synthesis and magnetic properties of magnetite-silicate nanocomposites derived from iron oxide of bacterial origin

    Hideki Hashimoto, Tatsuo Fujii, Makoto Nakanishi, Yoshihiro Kusano, Yasunori Ikeda, Jun Takada

    MATERIALS CHEMISTRY AND PHYSICS   136 ( 2-3 )   1156 - 1161   2012.10

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  • Fabrication of novel core-shell microspheres consisting of single-walled carbon nanotubes and CaCO3 through biomimetic mineralization

    Tomoyuki Tajima, Akira Tsutsui, Tatsuo Fujii, Jun Takada, Yutaka Takaguchi

    POLYMER JOURNAL   44 ( 6 )   620 - 624   2012.6

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  • Biogenic manganese oxide: effective new catalyst for direct bromination of hydrocarbons

    Yuta Nishina, Hideki Hashimoto, Noriyasu Kimura, Naoyuki Miyata, Tatsuo Fujii, Bunsho Ohtani, Jun Takada

    RSC ADVANCES   2 ( 16 )   6420 - 6423   2012

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  • マンガン酸化細菌が作るマンガン酸化物~その基礎・応用研究~(1)形態的・構造的特徴について

    木村倫康, 橋本英樹, 宮田直幸, 古谷充章, 仁科勇太, 中西真, 藤井達生, 高田潤

    日本化学会講演予稿集   92nd ( 1 )   2012

  • 微生物由来マンガン酸化物の機能探索-磁性流体を用いた磁性の付与-

    木村倫康, 橋本英樹, SAFARIK Ivo, 仁科勇太, 宮田直幸, 中西真, 藤井達生, 高田潤

    粉体粉末冶金協会講演概要集   2012   2012

  • 微生物由来マンガン酸化物のキャラクタリゼーションと固体触媒への応用

    木村倫康, 橋本英樹, 仁科勇太, 宮田直幸, 古谷充章, 中西真, 藤井達生, 高田潤

    粉体粉末冶金協会講演概要集   2012   2012

  • Microstructure and formation conditions of the reddish hi-iro marking on traditional Japanese ceramics

    Yoshihiro Kusano, Teruaki Danno, Keiko Tokunaga, Nobuaki Kamochi, Hideki Hashimoto, Makoto Nakanishi, Tatsuo Fujii, Minoru Fukuhara, Jun Takada

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   119 ( 1396 )   942 - 946   2011.12

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  • Synthesis and anomalous magnetic properties of LaFeO3 nanoparticles by hot soap method

    Tatsuo Fujii, Ikkoh Matsusue, Daisuke Nakatsuka, Makoto Nakanishi, Jun Takada

    MATERIALS CHEMISTRY AND PHYSICS   129 ( 3 )   805 - 809   2011.10

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  • 23aJA-4 Absorption edge evaluation using X-ray emission spectroscopy

    Ito Yoshiaki, Shigeoka Nobuyuki, Oohashi Hirofumi, Tochio Tatsunori, Fukushima Sei, Terasawa Mititaka, Fujii Tatsuo, Kageyama Hiroyuki, Yoshii Kenji, Yoneda Yasuhiro, Nisawa Atsushi

    Meeting abstracts of the Physical Society of Japan   66 ( 2 )   1001 - 1001   2011.8

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  • Synthesis of single-phase Sr3Co2Fe24O41 Z-type ferrite by polymerizable complex method

    Takeyuki Kikuchi, Tatsuya Nakamura, Tohru Yamasaki, Makoto Nakanishi, Tatsuo Fujii, Jun Takada, Yasunori Ikeda

    MATERIALS RESEARCH BULLETIN   46 ( 7 )   1085 - 1087   2011.7

  • Speculations on anomalous chemical states of Ti ions in FeTiO3 observed by high-resolution X-ray K beta emission spectra

    Tatsuo Fujii, Hirofumi Oohashi, Tatsunori Tochio, Yoshiaki Ito, Aurel-Mihai Vlaicu, Sei Fukushim

    JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA   184 ( 1-2 )   10 - 15   2011.2

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  • Anomalous hydrogen absorption on non-stoichiometric iron-carbon compound

    Hiroki Miyaoka, Takayuki Ichikawa, Tatsuo Fujii, Wataru Ishida, Shigehito Isobe, Hironobu Fuji, Yoshitsugu Kojima

    Journal of Alloys and Compounds   507 ( 2 )   547 - 550   2010.10

  • Magnetic properties of La-Co substituted M-type strontium hexaferrites prepared by polymerizable complex method

    Takeyuki Kikuchi, Tatsuya Nakamura, Tohru Yamasaki, Makoto Nakanishi, Tatsuo Fujii, Jun Takada, Yasunori Ikeda

    Journal of Magnetism and Magnetic Materials   322 ( 16 )   2381 - 2385   2010.8

  • 20pPSA-51 Electric Properties of Fe_2O_3-FeTiO_3 Solid Solution Films

    Mino T., Doi Y., Nakanishi M., Fujii T., Takada J.

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   576 - 576   2010.3

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  • 22pPSA-1 Structure and magnetic properties of elemental substituted FeTiO_3

    Nakatsuka D., Fujii T., Nakanishi M., Takada J.

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   498 - 498   2010.3

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  • Synthesis and characterization of new iron(III) layered hydroxides

    Tsutomu Katamoto, Hideki Hashimoto, Tatsuo Fujii, Jun Takada

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   57 ( 2 )   76 - 83   2010.2

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    DOI: 10.2497/jjspm.57.76

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  • Synthesis and characterization of new iron(III) layered hydroxides

    Tsutomu Katamoto, Hideki Hashimoto, Tatsuo Fujii, Jun Takada

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   57 ( 2 )   76 - 83   2010.2

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  • Structure and magnetic properties of Fe<inf>2</inf>O<inf>3</inf>-FeTiO <inf>3</inf> films

    Tatsuo Fujii, Tatsuya Sugano, Makoto Nakanishi, Jun Takada

    Journal of Physics: Conference Series   200 ( SECTION 7 )   072029-1-4   2010

  • Chemical modification of biogenous iron oxide to create an excellent enzyme scaffold

    Takashi Sakai, Yuki Miyazaki, Ai Murakami, Noriko Sakamoto, Tadashi Ema, Hideki Hashimoto, Mitsuaki Furutani, Makoto Nakanishi, Tatsuo Fujii, Jun Takada

    Organic and Biomolecular Chemistry   8 ( 2 )   336 - 338   2010

  • 27pPSA-57 Structure and magnetic properties of Ge substituted FeTiO_3

    Nakatsuka D., Fujii T., Nakanishi M., Takada J.

    Meeting abstracts of the Physical Society of Japan   64 ( 2 )   394 - 394   2009.8

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  • 27pYD-11 p-n properties of iron oxiside compounds/C60 system

    Nagata T., Hamao S., Takahashi Y., Maeda D., Kawai N., Sasaka H., Kubozono Y., Akedo J., Paku J., Fujii T., Kambe T., Ikeda N.

    Meeting abstracts of the Physical Society of Japan   64 ( 2 )   780 - 780   2009.8

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  • Effects of rice straw on the color and microstructure of bizen, a traditional japanese stoneware, as a function of oxygen partial pressure

    Yoshihiro Kusano, Akira Doi, Minoru Fukuhara, Makoto Nakanishi, Tatsuo Fujii, Jun Takada, Yasunori Ikeda, Mikio Takano, Catherine Henrist, Rudi Cloots, André Rulmont, Marcel Ausloos

    Journal of the American Ceramic Society   92 ( 8 )   1840 - 1844   2009.8

  • Synthesis and magnetic properties of AgI intercalated Bi-Ca-Co-O misfit-layer cobalt oxide

    Y. Tanaka, T. Fujii, M. Nakanishi, Y. Kusano, Y. Ikeda, J. Takada

    Materials Letters   63 ( 2 )   328 - 330   2009.1

  • Erratum to "Characteristics of hollow microtubes consisting of amorphous iron oxide nanoparticles produced by iron oxidizing bacteria, Leptothrix ochracea". [J. Magn. Magn. Mater. 310 (2007) 2405-2407] (DOI:10.1016/j.jmmm.2006.10.793)

    H. Hashimoto, S. Yokoyama, H. Asaoka, Y. Kusano, Y. Ikeda, M. Seno, J. Takada, T. Fujii, M. Nakanishi, R. Murakami

    Journal of Magnetism and Magnetic Materials   320 ( 18 )   2310 - 2310   2008.9

  • 21pPSA-59 Synthesis and properties of Ge substituted FeTiO_3

    Nakatsuka D., Fujii T., Nakanishi M., Takada J.

    Meeting abstracts of the Physical Society of Japan   63 ( 2 )   399 - 399   2008.8

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  • 21pPSA-8 Preparation and characterization of (001)- and (110)-oriented Fe_<2-x>Ti_xO_3 films for room temperature magnetic semiconductors

    Sugano T., Takada Y., Fujii T., Nakanishi M., Takada J.

    Meeting abstracts of the Physical Society of Japan   63 ( 2 )   386 - 386   2008.8

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  • Electronic structure of stoichiometric and non-stoichiometric epitaxial FeTiO<inf>3+δ</inf> films

    T. Fujii, Y. Takada, M. Nakanishi, J. Takada, M. Kimura, H. Yoshikawa

    Journal of Physics: Conference Series   100 ( 1 )   12043-1-4   2008.3

  • Epitaxial growth of ε-Fe<inf>2</inf>O<inf>3</inf> on mullite found through studies on a traditional Japanese stoneware

    Yoshihiro Kusano, Tatsuo Fujii, Jun Takada, Minoru Fukuhara, Akira Doi, Yasunori Ikeda, Mikio Takano

    Chemistry of Materials   20 ( 1 )   151 - 156   2008.1

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  • Structural and magnetic ordering in the V<inf>x</inf>Nb<inf>1+y</inf>S<inf>2</inf> system

    Makoto Nakanishi, Yukiyasu Matsuno, Tatsuo Fujii, Jun Takada, Kazuyoshi Yoshimura

    Journal of Physics and Chemistry of Solids   69 ( 1 )   49 - 54   2008.1

  • Preparation and characterization of epitaxial Fe2-x Tix O3 films with various Ti concentrations (0.5&lt;x&lt;1.0)

    Y. Takada, M. Nakanishi, T. Fujii, J. Takada, Y. Muraoka

    Journal of Applied Physics   104 ( 3 )   33713-1-5   2008

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  • Preparation and characterization of (001)- and (110)-oriented 0.6FeTi O<inf>3</inf>.0.4Fe<inf>2</inf>O<inf>3</inf> films for room temperature magnetic semiconductors

    Yusuke Takada, Makoto Nakanishi, Tatsuo Fujii, Jun Takada

    Applied Physics Letters   92 ( 25 )   252102-1-3   2008

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  • Epitaxial growth of epsilon iron oxide on mullite found through studies on traditional Japanese stoneware

    Yoshihiro Kusano, Tatsuo Fujii, Jun Takada, Minoru Fukuhara, Kazuhiro Yamaguchi, Kenji Takabatake, Akira Doi, Yasunori Iked, Mikio Takano

    A Global Road Map for Ceramic Materials and Technologies: Forecasting the Future of Ceramics, International Ceramic Federation - 2nd International Congress on Ceramics, ICC 2008, Final Programme   4-P-052-1-4-P-052-5   2008

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  • Salon: Hidasuki pattern on Bizen stoneware and Bengala: arts of flame and iron oxides

    Solid state physics   43 ( 5 )   303 - 314   2008

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  • Morphological and microstructural study of iron oxide microtubes formed by iron oxidizing bacteria, Leptothrix ochracea

    H. Hashimoto, S. Yokoyama, H. Asaoka, Y. Kusano, Y. Ikeda, M. Seno, J. Takada, T. Fujii, M. Nakanishi, R. Murakami

    A Global Road Map for Ceramic Materials and Technologies: Forecasting the Future of Ceramics, International Ceramic Federation - 2nd International Congress on Ceramics, ICC 2008, Final Programme   6-P-011-1-6-P-011-4   2008

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  • Preparation and characterization of (001) and (110)-oriented fe <inf>1.4</inf>Ti<inf>0.6</inf>O<inf>3</inf> films

    Tatsuo Fujii, Tatsuya Sugano, Yusuke Takada, Makoto Nakanishi, Jun Takada

    Materials Research Society Symposium Proceedings   1119   7 - 12   2008

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  • Synthesis, morphology and color tone properties of the lanthanum substituted hematite

    T. I. Bhuiyan, M. Nakanishi, Y. Kusano, T. Fujii, J. Takada, Y. Ikeda

    Materials Letters   61 ( 17 )   3774 - 3777   2007.7

  • Preparation and characterization of ilmenite-hematite thin films

    Y. Takada, M. Nakanishi, T. Fujii, J. Takada

    Journal of Magnetism and Magnetic Materials   310 ( 2 SUPPL. PART 3 )   2108 - 2110   2007.3

  • Characteristics of hollow microtubes consisting of amorphous iron oxide nanoparticles produced by iron oxidizing bacteria, Leptothrix ochracea

    H. Hashimoto, S. Yokoyama, H. Asaoka, Y. Kusano, Y. Ikeda, M. Seno, J. Takada, T. Fujii, M. Nakanishi, R. Murakami

    Journal of Magnetism and Magnetic Materials   310 ( 2 SUPPL. PART 3 )   2405 - 2407   2007.3

  • Large magnetic polarization of Ti4+ ions in FeTiO<inf>3</inf>

    T. Fujii, M. Yamashita, S. Fujimori, Y. Saitoh, T. Nakamura, K. Kobayashi, J. Takada

    Journal of Magnetism and Magnetic Materials   310 ( 2 SUPPL. PART 2 )   E555 - E557   2007.3

  • Synthesis, structures and properties of the cerium doped hematite co-existing with CeO<inf>2</inf>

    Tarequl Islam Bhuiyan, Makoto Nakanishi, Yoshihiro Kusano, Tatsuo Fujii, Jun Takada, Yasunori Ikeda

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   54 ( 2 )   112 - 118   2007.2

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  • Systematic study on synthesis and structural, electrical transport and magnetic properties of Pb-substituted Bi-Ca-Co-O misfit-layer cobaltites

    Yoshiaki Tanaka, Tatsuo Fujii, Makoto Nakanishi, Yoshihiro Kusano, Hideki Hashimoto, Yasunori Ikeda, Jun Takada

    Solid State Communications   141 ( 3 )   122 - 126   2007.1

  • Structure, Morphology and Color Tone Properties of theNeodymium Substituted Hematite

    Tarequl Islam Bhuiyan, Nakanishi Makoto, Fujii Tatsuo, Takada Jun

    Memoirs of the Faculty of Engineering, Okayama University   41 ( 1 )   93 - 98   2007.1

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  • Preparation of carbon/Fe-Ni-Cu alloy composite by polymerized complex method and characterization of their structure and electromagnetic wave absorption

    Nakanishi Makoto, Uchida Yukiko, Fujii Tatsuo, Takada Jun, Kusano Yoshihiro, Kikuchi Takeyuki

    TANSO   No.228 ( 228 )   158 - 162   2007

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    We have prepared Carbon/Fe-Ni-Cu ternary alloy composites by polymerized complex method. A single-phase Fe-Ni-Cu alloy could be obtained in carbon matrix by controlling pH of the citrate complex solution. It was revealed that the chemical compositions of metals in composites were maintained well by adding ethylene glycol into the complex solution. Crystallinity of both carbon matrix and Fe-Ni-Cu alloy particles were enhanced with increasing the carbonized temperature. The composite carbonized at 700°C had larger saturation magnetization and smaller coercivity than that carbonized at 500°C, which correlated with metal content and crystallite size of alloy. The composite carbonized at 700°C exhibited larger permeability and permittivity than carbon/Fe-Co alloy composites at frequency of GHz range.

    DOI: 10.7209/tanso.2007.158

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  • The valence state analysis of Ti in FeTiO<inf>3</inf> by soft X-ray spectroscopy

    Sei Fukushima, Takashi Kimura, Kenji Nishida, Vlaicu A. Mihai, Hideki Yoshikawa, Masahiro Kimura, Tatsuo Fujii, Hirofumi Oohashi, Yoshiaki Ito, Michiru Yamashita

    Microchimica Acta   155 ( 1-2 )   141 - 145   2006.9

  • The effect of heat treatment temperature on the microstructure and magnetic properties of Ba<inf>2</inf>Co<inf>2</inf>Fe<inf>12</inf>O<inf>22</inf> (Co<inf>2</inf>Y) prepared by sol-gel method

    Nimai Chand Pramanik, Tatsuo Fujii, Makoto Nakanishi, Jun Takada, Sang II Seok

    Materials Letters   60 ( 21-22 )   2718 - 2722   2006.9

  • 28pXD-7 Spectroscopical Study on Enhancement Effect of Hydrogen Storage Capacity by Iron in Nano-structural Carbon Materials

    Miyaoka H, Ichikawa T, Isobe S, Fujii T, Fujii H

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   939 - 939   2006.3

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  • FeTiO3/Fe2O3 Multilayered Films For New Magnetic Semiconductors Above Room Temperature

    Tatsuo Fujii, Yusuke Takada, Jun Takada

    Advances in Science and Technology   2006

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  • Preparation and characterization of epitaxial Fe<inf>2-x</inf>Ti <inf>x</inf>O<inf>3</inf> solid solution films

    Tatsuo Fujii, Hideki Hashimoto, Yusuke Takada, Makoto Nakanishi, Jun Takada

    Ceramic Transactions   195   87 - 94   2006

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  • Synthesis of Hexagonal Ferrites by Citric Complex Method

    Takeyuki Kikuchi, Tatsuya Nakamura, Masamichi Miki, Makoto Nakanishi, Tatsuo Fujii, Jun Takada, Yasunori Ikeda

    Advances in Science and Technology   2006

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  • Synthesis of cARBON/Fe-Ni-Cu alloy composite by carbonization of organometallic polymers and their magnetic properties

    Yukiko Uchida, Makoto Nakanishi, Tatsuo Fujii, Jun Takada, Akinori Muto, Yusaku Sakata

    Ceramic Transactions   195   67 - 74   2006

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  • Preparation of Z-type hexagonal ferrite, Co<inf>2</inf>Z, using alkaline mali de method

    Akira Sasaki, Makoto Nakanishi, Tatsuo Fujii, Jun Takada

    Ceramic Transactions   196   497 - 503   2006

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  • Preparation and characterization of FeTiO<inf>3</inf>-Fe<inf>2</inf>O <inf>3</inf> solid solution system

    Miki Yamashita, Makoto Nakanishi, Tatsuo Fujii, Jun Takada, Hideki Yoshikawa, Yuuji Saitoh, Shin Ichi Fujimori, Keisuke Kobayashi

    Ceramic Transactions   196   505 - 512   2006

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  • Effects of pH control on preparation of Z-type hexagonal ferrite Ba <inf>3</inf>Co<inf>2</inf>Fe<inf>24</inf>O<inf>41</inf> by polymerized complex method

    Makoto Nakanishi, Asako Akiyama, Tatsuo Fujii, Jun Takada, Takeyuki Kikuchi, Yoshihiro Kusano

    Ceramic Transactions   196   435 - 440   2006

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  • Iodine intercalation and deintercalation of a Sr-free Bi-based cuprate: Bi<inf>2</inf>(La,Na)<inf>2</inf>CuO

    Yoshiaki Tanaka, Makoto Nakanishi, Tatsuo Fujii, Jun Takada, Yoshihiro Kusano, Yasunori Ikeda

    Ceramic Transactions   196   85 - 90   2006

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  • Synthesis and characterization of cerium substituted hematite by sol-gel method

    Nimai Chand Pramanik, Tarequl Islam Bhuiyan, Makoto Nakanishi, Tatsuo Fujii, Jun Takada, Sang Il Seok

    Materials Letters   59 ( 28 )   3783 - 3787   2005.12

  • Site-specific valence-band X-ray photoelectron spectra of a SrTiO <inf>3</inf> single-crystal by X-ray standing wave technique

    Tatsuo Fujii, Masahiro Kimura, Hideki Yoshikawa, Sei Fukushima

    Solid State Communications   136 ( 7 )   375 - 379   2005.11

  • Magnetic properties of Fe<inf>1.2</inf>Ti<inf>0.8</inf>O <inf>3</inf>/Fe<inf>2</inf>O<inf>3</inf> bilayered films

    Tatsuo Fujii, Yusuke Takada, Makoto Nakanishi, Jun Takada

    IEEE Transactions on Magnetics   41 ( 10 )   2775 - 2777   2005.10

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  • The influence of the impurity element and the heat temperature upon the traditional Japanese red color pigment "bengara"

    Hiroshi Asaoka, Makoto Nakanishi, Tatsuo Fujii, Jun Takada, Yoshihiro Kusano, Ryu Murakami

    C e Ca   35 ( 2 )   85 - 91   2005.9

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  • Preparation and magnetic properties of Carbon/Fe-Co alloy composite by polymerized complex method

    Yukiko Uchida, Kyoko Oishi, Makoto Nakanishi, Tatsuo Fujii, Jun Takada, Yoshihiro Kusano, Takeyuki Kikuchi

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   52 ( 8 )   640 - 645   2005.8

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  • Preparation and magnetic properties of the CoFe<inf>2</inf>O<inf>4</inf> thin films on Si substrate by sol-gel technique

    Nimai Chand Pramanik, Tatsuo Fujii, Makoto Nakanishi, Jun Takada

    Journal of Materials Science   40 ( 16 )   4169 - 4172   2005.8

  • Development of nanograined hexagonal barium ferrite thin films by sol-gel technique

    Nimai Chand Pramanik, Tatsuo Fujii, Makoto Nakanishi, Jun Takada

    Materials Letters   59 ( 4 )   468 - 472   2005.2

  • Oxidation resistance of Mo coated with Mo(Si,Al) <inf>2</inf> layer prepared by dipping into liquid of Al-25 mass%Si alloy

    Shinsuke Kunitsugu, Norihide Nishida, Takao Tomiya, Masahiro Nagae, Makoto Nakanishi, Tatsuo Fujii, Jun Takada

    Materials Transactions   46 ( 2 )   215 - 218   2005.2

  • Development of Co<inf>1+x</inf>Fe<inf>2-x</inf>O<inf>4</inf> (x=0-0.5) thin films on SiO<inf>2</inf> glass by the sol-gel method and the study of the effect of composition on their magnetic properties

    Nimai Chand Pramanik, Tatsuo Fujii, Makoto Nakanishi, Jun Takada

    Materials Letters   59 ( 1 )   88 - 93   2005.1

  • Effect of Co2+ ion on the magnetic properties of sol-gel cobalt ferrite thin films

    Nimai Ch Pramanik, Tatsuo Fujii, Makoto Nakanishi, Jun Takada

    Journal of Materials Chemistry   14 ( 22 )   3328 - 3332   2004.11

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  • Microstructure and formation process of the characteristic reddish color pattern Hidasuki on Bizen stoneware: Reactions involving rice straw

    Yoshihiro Kusano, Minoru Fukuhara, Tatsuo Fujii, Jun Takada, Ryu Murakami, Akira Doi, Laurence Anthony, Yasunori Ikeda, Mikio Takano

    Chemistry of Materials   16 ( 19 )   3641 - 3646   2004.9

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  • Magnetic properties of La-Co substituted M-type Sr-ferrite fine powders prepared by the citrate process

    KIKUCHI T., NAKAMURA T., NAKANISHI M., FUJII T., TAKADA J., IKEDA Y., MIKI M.

    28   419 - 419   2004.9

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  • Ilmenite-hematite solid solution films for novel electronic devices

    Tatsuo Fujii, Masakazu Kayano, Yusuke Takada, Makoto Nakanishi, Jun Takada

    Solid State Ionics   172 ( 1-4 SPEC. ISS. )   289 - 292   2004.8

  • Preparation of Y-type hexagonal ferrite's films by polymerized complex method

    K. Komatsu, M. Nakanishi, T. Fujii, J. Takada

    Journal of Magnetism and Magnetic Materials   272-276 ( SUPPL. 1 )   E1831 - E1832   2004.5

  • Preparation and characterization of epitaxial FeTiO<inf>3+λ</inf> films

    Tatsuo Fujii, Masakazu Kayano, Yusuke Takada, Makoto Nakanishi, Jim Takada

    Journal of Magnetism and Magnetic Materials   272-276 ( III )   2010 - 2011   2004.5

  • 27pXN-12 Chemical effect in Ti Kβ emission spectra

    Tochio Tatsunori, Oohashi Hirofumi, Ito Yoshiaki, Mihai Vlaicu A., Fukuahima Sei, Fujii Tatsuo, Yamashita Michiru

    Meeting abstracts of the Physical Society of Japan   59 ( 1 )   158 - 158   2004.3

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  • X 線定在波法によるSrTiO3 結晶のサイト選択的XPS 測定

    藤井達生, 木村昌弘, 吉川英樹, 福島 整

    Journal of Surface Analysis   11 ( 3 )   165 - 169   2004

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  • 新規広帯域高周波帯電磁波吸収体の研究開発

    高田 潤, 中西 真, 藤井達生

    機械の研究vol.56, no.5, pp.536-542   vol.56, no.5, pp.536-542 ( 5 )   536 - 542   2004

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  • Crystalline Control of Bincho Charcoal by using Catalytic Graphitization and Electromagnetic Wave Absorption Characteristics of Derived Carbon

    Yukiko Uchida, Makoto Nakanishi, Tatsuo Fujii, Jun Takada, Akinori Muto, Yusaku Sakata, Yoshihiro Kusano, Takeyuki Kikuchi

    Transactions of the Materials Research Society of Japan   2004

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  • 807 高周波用Y型六方晶フェライト薄膜の作製と磁気特性(薄膜物性,一般セッション,第53期学術講演会)

    小松 幸太郎, 中西 真, 藤井 達生, 高田 潤

    学術講演会講演論文集   53   215 - 215   2004

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  • 810 フェライト/SiC複合焼結体の作製と電磁波吸収特性(セラミックスの物性評価,一般セッション,第53期学術講演会)

    中西 真, 小倉 和生, 藤井 達生, 高田 潤

    学術講演会講演論文集   53   220 - 221   2004

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  • 814 吹屋ベンガラのキャラクタリゼーションとその再現(表面改質・色彩評価,一般セッション,第53期学術講演会)

    浅岡 裕史, 中西 真, 藤井 達生, 高田 潤

    学術講演会講演論文集   53   228 - 228   2004

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  • Characterization and Reproduction of "Fukiya Bengara", Noble Red Color Pigment, by Fe<inf>2</inf>O<inf>3</inf>-Al<inf>2</inf>O<inf>3</inf> System

    Hiroshi Asaoka, Yoshihiro Kusano, Makoto Nakanishi, Tatsuo Fujii, Jun Takada

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   50 ( 12 )   1062 - 1067   2003.12

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    DOI: 10.2497/jjspm.50.1062

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  • Electronic States of Iron-Titanium Oxides Analyzed by Photelectron Spectroscopy

    Fujii T., Kayano M., Takada Y., Nakanishi M., Takada J., Ito Y., Kimura M., Vlaicu M. A., Yoshikawa H., Fukushima S., Tanaka A.

    Meeting abstracts of the Physical Society of Japan   58 ( 2 )   528 - 528   2003.8

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  • Electronic States of Epitaxial FeTiO_3 Films

    Fujii T., Kayano M., Takada Y., Nakanishi M., Takada H., Oohashi H., Shigeoka N., Ito Y., Kimura M., Vlaicu M. A., Yoshikawa H., Fukushima S., Tanaka A., Yamashita M.

    Meeting abstracts of the Physical Society of Japan   58 ( 1 )   475 - 475   2003.3

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  • Microstructure and formation mechanism of fire-make pattern on Japanese traditional “BIZEN” earthenware

    Y. Kusano, A. Doi, M. Nakanishi, T. Fujii, J. Takada, M. Fukuhara, R. Murakami

    Proceedings of 10th International Ceramics Congress, Science for New Technology of Silicate Ceramics   2003

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  • The influence of the additional element and the heat temperature upon traditional red color pigment

    H. Asaoka, M. Nakanishi, T. Fujii, J. Takada, Y. Kusano, R. Murakami

    Proceedings of 10th International Ceramics Congress, Science for New Technology of Silicate Ceramics   2003

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  • FeTiO3中のTiの化学状態

    福島整, 藤井達生, 高田裕輔, 伊藤嘉昭, 大橋浩史, 吉川英樹, 田中彰博, 山下満, 元山宗之

    応用物理学関係連合講演会講演予稿集   50th ( 2 )   2003

  • プレセラミックス法によるフェライト系複合材料の作製と電波吸収特性

    高田潤, 中西真, 藤井達生

    日本応用磁気学会誌   26   818 - 822   2002

  • Nonstoichiometry of epitaxial FeTiO<inf>3+δ</inf> films

    Tatsuo Fujii, Makoto Sadai, Masakazu Kayano, Makoto Nakanishi, Jun Takada

    Materials Research Society Symposium - Proceedings   746   55 - 60   2002

  • Low-temperature growth of c-axis-oriented Y-type hexagonal ferrite thin films by the polymeric precursor method

    Tatsuo Fujii, Aiko Harano, Makoto Nakanishi, Jun Takada

    Journal of Materials Research   16 ( 9 )   2471 - 2474   2001.9

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  • NO2-assisted molecular-beam epitaxy of wustitelike and magnetitelike Fe oxynitride films on MgO(100)

    FC Voogt, PJM Smulders, GH Wijnja, L Niesen, T Fujii, MA James, T Hibma

    PHYSICAL REVIEW B   63 ( 12 )   2001.3

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  • Exchange coupling and spin-flip transition of CoFe<inf>2</inf>O<inf>4</inf>/α-Fe<inf>2</inf>O<inf>3</inf> bilayered films

    Tatsuo Fujii, Takuya Yano, Makoto Nakanishi, Jun Takada

    Materials Research Society Symposium - Proceedings   674   2001

  • Synthesis and properties of Pb-doped Bi-2212 phase

    Y. Kusano, A. Doi, M. Nakanishi, T. Fujii, J. Takada, Y. Ikeda, M. Takano

    Key Engineering Materials   206-213 ( II )   1469 - 1472   2001

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  • Low-temperature growth of C-axis oriented Y-type hexagonal ferrite's films by polymerized complex method

    Tatsuo Fujii, Koutarou Komatsu, Makoto Nakanishi, Jun Takada

    Materials Research Society Symposium Proceedings   656   43 - 48   2001

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  • Characteristics of microwave absorption of Ni-Zn-ferrite/SiC hemi-crystallized composites

    Makoto Nakanishi, Tomonori Shibuya, Tatsuo Fujii, Jun Takada

    Materials Research Society Symposium Proceedings   656   37 - 42   2001

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  • Anomalous field-induced magnetic transitions in V<inf>5</inf>X<inf>8</inf> (X = S,Se)

    M. Nakanishi, K. Yoshimura, K. Kosuge, T. Goto, T. Fujii, J. Takada

    Journal of Magnetism and Magnetic Materials   221 ( 3 )   301 - 306   2000.11

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    DOI: 10.1016/S0304-8853(00)00509-6

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  • Preparation and absorption characteristics of Ni-Zn ferrite/SiC sintered composites prepared by pre-ceramics method

    Makoto Nakanishi, Masaki Yoshino, Tatsuo Fujii, Jun Takada, Minoru Fukuhara

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   47 ( 8 )   927 - 930   2000.8

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    DOI: 10.2497/jjspm.47.927

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  • Introduction of Flux Pining Centers in Bi-based Superconductors by Heavy Ion Irradiation.

    高田潤, 菊池丈幸, 中西真, 藤井達生, 長江正寛, 草野圭弘, 池田靖訓, 安田仲宏, 村上健

    NIRS-M (Natl Inst Radiol Sci)   ( 139 )   203 - 204   2000.4

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  • Anomalous field-induced magnetic transitions in V5X8 (X = S,Se)

    M. Nakanishi, K. Yoshimura, K. Kosuge, T. Goto, T. Fujii, J. Takada

    Journal of Magnetism and Magnetic Materials   221 ( 3 )   301 - 306   2000

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    DOI: 10.1016/S0304-8853(00)00509-6

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  • Electric and magnetic properties of epitaxial Fe<inf>2-x</inf>Ti<inf>x</inf>O<inf>3+δ</inf> films

    T. Fujii, K. Ayama, M. Nakanishi, M. Sohma, K. Kawaguchi, J. Takada

    Materials Research Society Symposium - Proceedings   623   191 - 196   2000

  • Preparation of CoFe_2O_4/α-Fe_2O_3 bilayered films by helicon plasma sputtering

    YANO T., FUJII T., NAKANISHI M., TAKADA J

    23   20 - 20   1999.10

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  • Electrochemical Li intercalation into the Li-doped Bi-2212 phase prepared by solid state reaction

    Makoto Nakanishi, Kimio Yokoyama, Takeyuki Kikuchi, Masashi Fujiwara, Tatsuo Fujii, Jun Takada, Yoshihiro Kusano, Yasunori Ikeda, Yasuo Takeda

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   46 ( 9 )   990 - 993   1999.9

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    DOI: 10.2497/jjspm.46.990

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  • FeTiO<inf>3</inf>-α-Fe<inf>2</inf>O<inf>3</inf> solid solution films prepared by a reactive vapor deposition technique

    Tatsuo Fujii, Kenji Ayama, Makoto Nakanishi, Jun Takada

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   46 ( 6 )   643 - 647   1999.6

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    DOI: 10.2497/jjspm.46.643

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  • In situ xps analysis of various iron oxide films grown by (formula presented)-assisted molecular-beam epitaxy

    T. Fujii, F. M.F. de Groot, G. A. Sawatzky, F. C. Voogt, T. Hibma, K. Okada

    Physical Review B - Condensed Matter and Materials Physics   59 ( 4 )   3195 - 3202   1999

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  • In situ xps analysis of various iron oxide films grown by (formula presented)-assisted molecular-beam epitaxy

    T. Fujii, F. M.F. de Groot, G. A. Sawatzky, F. C. Voogt, T. Hibma, K. Okada

    Physical Review B - Condensed Matter and Materials Physics   59 ( 4 )   3195 - 3202   1999

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  • NO<inf>2</inf>-assisted molecular-beam epitaxy of Fe<inf>3</inf>O<inf>4</inf>, Fe<inf>3</inf>-δO<inf>4</inf>, and γ-Fe<inf>2</inf>O<inf>3</inf> thin films on MgO(100)

    F. C. Voogt, T. Fujii, P. J.M. Smulders, L. Niesen, M. A. James, T. Hibma

    Physical Review B - Condensed Matter and Materials Physics   60 ( 15 )   11193 - 11206   1999

  • Structure and Magnetism of V_XNbS_<2-δ>

    MATSUNO Yukiyasu, NAKANISHI Makoto, FUJII Tatsuo, TAKADA Jun

    Meeting abstracts of the Physical Society of Japan   53 ( 2 )   475 - 475   1998.9

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  • LiドープBi2212相に関する分光学的研究

    高田潤, 中西真, 菊池丈幸, 藤井達生, 長田実, 垣花真人

    東京工業大学応用セラミックス研究所共同利用研究報告書   1997   74   1998.9

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  • Preparation and Magnetic Properties of Fe<inf>3</inf>O<inf>4</inf>/MO(M=Ni, Co) Superlattices

    Tatsuo Fujii, Hiroshi Asaoka, Makoto Nakanishi, Jun Takada

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   45 ( 1 )   58 - 62   1998.1

  • Preparation of FeTiO_3-α-Fe_2O_3 solid solution films by reactive evaporation method

    FUJII T., AYAMA K., NAKANISHI M., TAKADA J.

    21   457 - 457   1997.10

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  • Li doping into the Pb substituted Bi-2212 phase by electrochemical method

    Hirofumi Joko, Masashi Fujiwara, Makoto Nakanishi, Tatsuo Fujii, Jun Takada, Yoshihiro Kusano, Yasuo Takeda, Yasunori Ikeda, Mikio Takano, Yoshichika Bando

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   44 ( 8 )   792 - 796   1997.8

  • Electrochemical lithium intercalation into the Bi-2212 phase

    M. Fujiwara, M. Nakanishi, Y. Kusano, T. Fujii, J. Takada, Y. Takeda, Y. Ikeda

    Physica C: Superconductivity and its Applications   279 ( 3-4 )   219 - 224   1997.6

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    DOI: 10.1016/S0921-4534(97)00177-9

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  • Electrochemical lithium intercalation into the Bi-2212 phase

    M. Fujiwara, M. Nakanishi, Y. Kusano, T. Fujii, J. Takada, Y. Takeda, Y. Ikeda

    Physica C: Superconductivity and its Applications   279 ( 3-4 )   219 - 224   1997.6

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    DOI: 10.1016/S0921-4534(97)00177-9

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  • 28a-PS-82 Magnetic transitions of vanadium chalcogenides II

    Nakanishi M., Fujii T., Takada J., Yoshimura K., Kosuge K., Goto T.

    Meeting abstracts of the Physical Society of Japan   52 ( 1 )   424 - 424   1997.3

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  • Growth and properties of multilayered Ba- and Sr-Ferrites' films

    T. Fujii, H. Kato, Y. Miura, J. Takada

    Journal De Physique. IV : JP   7 ( 1 )   C1-485-486   1997.3

  • Magnetite Fe<inf>3-δ</inf>O<inf>4</inf>: A stoichiometry and structure analysis of MBE grown thin films using NO<inf>2</inf> as the oxidizing source

    F. C. Voogt, T. Hibma, P. J.M. Smulders, L. Niesen, T. Fujii, P. A.A. van der Heijden, R. J.M. van de Veerdonk, P. J. van der Zaag

    Journal De Physique. IV : JP   7 ( 1 )   601 - 602   1997.3

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  • Magnetite Fe<inf>3-δ</inf>O<inf>4</inf>: A stoichiometry and structure analysis of MBE grown thin films using NO<inf>2</inf> as the oxidising source

    F. C. Voogt, T. Hibma, P. J.M. Smulders, L. Niesen, T. Fujii, P. A.A. Van Der Heijden, R. J.M. Van De Veerdonk, P. J. Van Der Zaag

    Journal De Physique. IV : JP   7 ( 1 )   C1-601-602   1997.3

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  • Li doping to the 2212 phase in the Bi-Sr-Ca-Cu-O system

    Masashi Fujiwara, Masahiro Nagae, Yoshihiro Kusano, Tatsuo Fujii, Jun Takada

    Physica C: Superconductivity and its Applications   274 ( 3-4 )   317 - 322   1997.2

  • Li doping into the Bi-2212 phase by electrochemical method

    Masashi Fujiwara, Makoto Nakanishi, Tatsuo Fujii, Jun Takada, Yoshihiro Kusano, Yasuo Takeda, Yasunori Ikeda, Mikio Takano, Yoshichika Bando

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   44 ( 2 )   142 - 146   1997.2

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    Language:Japanese   Publisher:Funtai Funamtsu Yakin Kyokai/Japan Soc. of Powder Metallurgy  

    DOI: 10.2497/jjspm.44.142

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  • Preparation and Properties of ZnO Transparent Conductive Thin Films by Activated Reactive Evaporation Method

    2 ( 1 )   121 - 129   1997.1

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  • In situ RHEED and XPS studies of epitaxial thin α-Fe<inf>2</inf>O<inf>3</inf>(0001) films on sapphire

    T. Fujii, D. Alders, F. C. Voogt, T. Hibma, B. T. Thole, G. A. Sawatzky

    Surface Science   366 ( 3 )   579 - 586   1996.11

  • Magnetic and Electronic Structures of Fe_3O_4/MO(M=Co, Ni)Artificial Supperlattices

    Fujii Tatsuo, Asaoka Hiroshi, Takada Jun

    Abstracts of the meeting of the Physical Society of Japan. Sectional meeting   1996 ( 3 )   72 - 72   1996.9

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  • Magnetic transitions of vanadium chalcogenides

    Nakanishi M., Fujii T., Takada J., Yoshimura K., Kosuge K., Goto T.

    Abstracts of the meeting of the Physical Society of Japan. Sectional meeting   1996 ( 3 )   107 - 107   1996.9

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  • Growth and properties of epitaxial iron oxide layers

    F. C. Voogt, T. Fujii, T. Hibma, M. Hoefman, P. J.M. Smulders, G. H. Wijnja, G. L. Zhang, L. Niesen

    Hyperfine Interactions   97-98 ( 1 )   99 - 108   1996

  • Magnetic properties of iron-oxide small particles prepared on aluminum and MgO(100)

    K. Fukumura, A. Nakanishi, T. Fujii, T. Kobayashi

    Journal of Magnetism and Magnetic Materials   145 ( 1-2 )   175 - 180   1995.3

  • Preparation and Characterization of Fe<inf>3</inf>O<inf>4</inf>/CoO Superlattices by Reactive Vapor Deposition Method

    Tatsuo Fujii, Mitsuhiro Asano, Hiroshi Asaoka, Yoshinari Miura, Jun Takada

    Journal of the Japan Society of Powder and Powder Metallurgy   42 ( 1 )   34 - 39   1995

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  • Spin-flip anomalies in epitaxial α-Fe<inf>2</inf>O<inf>3</inf> films by Mössbauer spectroscopy

    Tatsuo Fujii, Mikio Takano, Rintaro Kakano, Yasuhito Isozumi, Yoshichika Bando

    Journal of Magnetism and Magnetic Materials   135 ( 2 )   231 - 236   1994.7

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  • Characteristics of titanium oxide films deposited by an activated reactive evaporation method

    Tatsuo Fujii, Naoki Sakata, Jun Takada, Yoshinari Miura, Yoshihiro Daitoh, Mikio Takano

    Journal of Materials Research   9 ( 6 )   1468 - 1473   1994.6

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  • Surface and interface properties of epitaxial Fe<inf>3</inf>O<inf>4</inf> films studied by Mössbauer spectroscopy

    Tatsuo Fujii, Mikio Takano, Rintaro Katano, Yasuhito Isozumi, Yoshichika Bando

    Journal of Magnetism and Magnetic Materials   130 ( 1-3 )   267 - 274   1994.2

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  • Characteristics of titanium oxide films deposited by an activated reactive evaporation method

    Tatsuo Fujii, Naoki Sakata, Jun Takada, Yoshinari Miura, Yoshihiro Daitoh, Mikio Takano

    Journal of Materials Research   9 ( 6 )   1468 - 1473   1994

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  • Surface and interface properties of epitaxial Fe3O4 films studied by Mössbauer spectroscopy

    Tatsuo Fujii, Mikio Takano, Rintaro Katano, Yasuhito Isozumi, Yoshichika Bando

    Journal of Magnetism and Magnetic Materials   130 ( 1-3 )   267 - 274   1994

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  • Spin-flip anomalies in epitaxial α-Fe2O3 films by Mössbauer spectroscopy

    Tatsuo Fujii, Mikio Takano, Rintaro Kakano, Yasuhito Isozumi, Yoshichika Bando

    Journal of Magnetism and Magnetic Materials   135 ( 2 )   231 - 236   1994

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  • Operation of a cryogenic conversion electron proportional counter under strong magnetic fields

    Tatsuo Fujii, Nobuyoshi Hosoito, Rintaro Katano, Yasuhito Isozumi

    Nuclear Inst. and Methods in Physics Research, B   76 ( 1-4 )   207 - 209   1993.4

  • 31p-PSB-46 Preparation of the Fe_3O_4/MO artificial superlattices by a reactive evaporation method

    Fujii T., Sakamoto M., Asano M., Nanba T., Osaka A., Takada J., Miura Y.

    Abstracts of the meeting of the Physical Society of Japan. Annual meeting   48 ( 3 )   121 - 121   1993.3

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  • Preparation of Fe<inf>3</inf>O<inf>4</inf>/MgO Artificial Superlattices by Activated Reactive Evaporation Method

    Masakatsu Sakamoto, Mitsuhiro Asano, Tatsuo Fujii, Tokuro Nanba, Akiyoshi Osaka, Yoshinari Miura, Jun Takada

    journal of the japan society of powder and powder metallurgy   39 ( 11 )   985 - 988   1992.7

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  • Preparation of Fe<inf>3</inf>O<inf>4</inf> Single-crystalline Films by Reactive Evaporation Method

    F. Tatsuo, Sakamoto Masakatsu, A. Mitsuhiro, N. Tokuro, O. Akiyoshi, M. Yoshinari, T. Jun, S. Ken-ichi, T. Takahito, B. Yoshichika

    journal of the japan society of powder and powder metallurgy   39 ( 11 )   981 - 984   1992.7

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  • Mössbauer Spectroscopic Study of Surface and Interface Properties of Epitaxial Fe<inf>3</inf>O<inf>4</inf> Films

    Tatsuo Fujii, Jun Takada, Yoshinari Miura, Mikio Takano, Yoshichika Bando

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   39 ( 2 )   143 - 146   1992

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  • Preparation of Fe3O4 Single-crystalline Films by Reactive Evaporation Method

    Fujii Tatsuo, Sakamoto Masakatsu, Asano Mitsuhiro, Nanba Tokuro, Osaka Akiyoshi, Miura Yoshinari, Takada Jun, Shimura Ken-ichi, Terashima Takahito, Bando Yoshichika

    journal of the japan society of powder and powder metallurgy   39 ( 11 )   981 - 984   1992

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  • Preparation of Fe3O4/MgO Artificial Superlattices by Activated Reactive Evaporation Method

    Masakatsu Sakamoto, Mitsuhiro Asano, Tatsuo Fujii, Tokuro Nanba, Akiyoshi Osaka, Yoshinari Miura, Jun Takada

    journal of the japan society of powder and powder metallurgy   39 ( 11 )   985 - 988   1992

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  • Preparation of Fe3O4/MgO Artificial Superlattices by Activated Reactive Evaporation Method

    Masakatsu Sakamoto, Mitsuhiro Asano, Tatsuo Fujii, Tokuro Nanba, Akiyoshi Osaka, Yoshinari Miura, Jun Takada

    journal of the japan society of powder and powder metallurgy   39 ( 11 )   985 - 988   1992

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  • Preparation of Fe3O4 Single-crystalline Films by Reactive Evaporation Method

    Fujii Tatsuo, Sakamoto Masakatsu, Asano Mitsuhiro, Nanba Tokuro, Osaka Akiyoshi, Miura Yoshinari, Takada Jun, Shimura Ken-ichi, Terashima Takahito, Bando Yoshichika

    journal of the japan society of powder and powder metallurgy   39 ( 11 )   981 - 984   1992

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  • Mössbauer Study on the Magnetic Properties of a Single Crystalline Bi<inf>3</inf>Fe<inf>5</inf>O<inf>12</inf> Film

    Tatsuo Fujii, Mikio Takano, Yoshichika Bando, Takashi Okuda

    Journal of the Japan Society of Powder and Powder Metallurgy   38 ( 3 )   427 - 430   1991

  • Mössbauer Spectroscopic Study of Surface and Interface Properties of Epitaxial Fe3O4 Films

    Tatsuo Fujii, Jun Takada, Yoshinari Miura

    journal of the japan society of powder and powder metallurgy   39 ( 2 )   143 - 146   1991

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  • Conversion electron Mössbauer spectroscopy of a single crystalline Bi<inf>3</inf>Fe<inf>5</inf>O<inf>12</inf> film

    T. Fujii, M. Takano, R. Katano, Y. Bando, Y. Isozumi, T. Okuda

    Journal of Magnetism and Magnetic Materials   92 ( 2 )   261 - 264   1990.11

  • Conversion electron Mossbauer spectroscopy study of single-crystalline Magnetite films (II)

    FUJII T., TAKANO M., KATANO R., BANDO Y., ISOZUMI Y.

    45 ( 3 )   67 - 67   1990.3

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  • CEMS study of the growth and properties of Fe<inf>3</inf>O<inf>4</inf> films

    T. Fujii, M. Takano, R. Katano, Y. Bando, Y. Isozumi

    Journal of Crystal Growth   99 ( 1-4 )   606 - 610   1990.1

  • Depth selective Mössbauer spectroscopic study of Fe<inf>3</inf>O <inf>4</inf> epitaxial films

    T. Fujii, M. Takano, R. Katano, Y. Bando, Y. Isozumi

    Journal of Applied Physics   68 ( 4 )   1735 - 1740   1990

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    DOI: 10.1063/1.346602

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  • Depth selective Mössbauer spectroscopic study of Fe3O 4 epitaxial films

    T. Fujii, M. Takano, R. Katano, Y. Bando, Y. Isozumi

    Journal of Applied Physics   68 ( 4 )   1735 - 1740   1990

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    DOI: 10.1063/1.346602

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  • 29a-PS-81 A conversion electron Mossbauer spectroscopy study of single-crystalline Magnetite films

    FUJII T., TAKANO M., KATANO R., BANDO Y., ISOZUMI Y.

    44 ( 3 )   82 - 82   1989.3

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  • Helium-filled proportional counter for low-temperature operation (1.75-4.2 K) and its application to cryogenic resonance-electron Mössbauer spectroscopy II

    Yasuhito Isozumi, Shin Ito, Tatuo Fujii, Rintaro Katano

    Review of Scientific Instruments   60 ( 10 )   3262 - 3264   1989

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    DOI: 10.1063/1.1140562

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  • Helium-filled proportional counter for low-temperature operation (1.75-4.2 K) and its application to cryogenic resonance-electron Mössbauer spectroscopy II

    Yasuhito Isozumi, Shin Ito, Tatuo Fujii, Rintaro Katano

    Review of Scientific Instruments   60 ( 10 )   3262 - 3264   1989

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    DOI: 10.1063/1.1140562

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  • Preparation and characterization of (111)-oriented Fe<inf>3</inf>O <inf>4</inf> films deposited on sapphire

    T. Fujii, M. Takano, R. Katano, Y. Bando, Y. Isozumi

    Journal of Applied Physics   66 ( 7 )   3168 - 3172   1989

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    DOI: 10.1063/1.344154

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  • Preparation and characterization of (111)-oriented Fe3O 4 films deposited on sapphire

    T. Fujii, M. Takano, R. Katano, Y. Bando, Y. Isozumi

    Journal of Applied Physics   66 ( 7 )   3168 - 3172   1989

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    DOI: 10.1063/1.344154

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Presentations

  • (SrCa)(FeCo)12-δO19-η における異方性磁場及び 76GHz 近傍での磁気共鳴の測定

    兵頭 一茂, 中西 真, 狩野 旬, 藤井 達生

    日本セラミックス協会2021年年会 

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    Event date: 2021.3.23 - 2021.3.25

    Presentation type:Oral presentation (general)  

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  • パイプ状多孔質酸化鉄上への水熱法による MFI 型ゼオライトの合成

    張 斉, 中西 真, 藤井達生

    日本セラミックス協会2021年年会 

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    Event date: 2021.1.23 - 2021.1.25

    Presentation type:Poster presentation  

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  • 鉄系複酸化物ナノ粒子の合成と Li イオン二次電池への応用

    渡辺 穂香, 藤井 達生

    第59回セラミックス基礎科学討論会  2021.1.7 

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    Event date: 2021.1.7 - 2021.1.8

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  • 鉄酸化沈殿物を鋳型としたチタニアナノ粒子の作製と特性評価

    小田智尋, 田村勝徳, 藤井 達生

    第59回セラミックス基礎科学討論会 

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    Event date: 2021.1.7 - 2021.1.8

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  • In situ M?ssbauer analysis of bacterial iron-oxide nano-particles for lithium-ion battery Invited International conference

    Ryo Sakuma, Hideki Hashimoto, Tatsuo Fujii, Jun Takada, Naoaki Hayashi, Mikio Takano

    5th Mediterranean Conference on the Applications of the M?ssbauer Effect 

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    Event date: 2019.5.19 - 2019.5.23

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Montpellier, France  

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  • スパッタ法によるFe3O4下地層上へのエピタキシャルYbFe2O4薄膜の作製 Invited

    藤井達生

    第28回日本MRS年次大会 

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    Event date: 2018.12.18 - 2018.12.20

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:北九州市  

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Research Projects

  • Successive charge order pahse transition in electronic ferroelectrics

    Grant number:22H01942  2022.04 - 2025.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    池田 直, 藤井 達生, 沖本 洋一, 藤原 孝将

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    Grant amount:\17420000 ( Direct expense: \13400000 、 Indirect expense:\4020000 )

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  • Study in the successive transition of the charge-ordering phase in electron ferroelectrics

    Grant number:23K23210  2022.04 - 2025.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    池田 直, 藤井 達生, 沖本 洋一, 藤原 孝将

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    Grant amount:\17420000 ( Direct expense: \13400000 、 Indirect expense:\4020000 )

    我々は電子集団が自発的に極性な配置を形成する電子強誘電体が常温に存在することを解明してきた。さらにこの物性が、超高速応答、省電力分極反転、THz発生源動作,マルチフェロイック機能などの魅力的な新機能を持つことも明らかにしつつある。一方でこの物性の起源に対する理論的解釈では、鉄d電子間の電荷間クーロン相互作用、Fe2+に存在するホール軌道による超交換相互作用の量子縮退と競合、さらにそれらの熱ゆらぎ効果にあるとされているが、その実験的証拠はまだ十分に得られていない。
    本研究は、電子強誘電体の低温の逐次相転移近傍に注目し、極性電荷秩序(強誘電)相と非極性電荷秩序相の境界領域、さらにそれに重なる磁気相転移点付近での誘電・磁気応答や電子構造を解析することを目標としている。最終的にFeイオン間相互作用の光制御手法を完成し、この相境界付近での光―誘電―磁 気応答を精密に評価することで、電子強誘電体の起源 であるd電子間相互作用とスピン揺らぎ効果の役割を、世界に先駆け総合的に解明することである。
    本年度は特に、YFE2O4の示す磁気転移発生に伴った3倍電荷秩序相と7倍電荷秩序相の相境界の存在について、詳細な構造がを明らかにしている。また合わせて非磁性の3倍秩序相において、異常な磁歪効果があることを新たに発見した。特に後者について理論研究者も交えた解析が行われている。この現象は本材料が示す、極性な電荷秩序の安定性とスピンゆらぎ効果の顕著な相関(ないし強い因果関係)を示す露頭ではないかと認識され、24年度から集中的な実験が行われることとなった。
    また強誘電分極を示す3倍電荷秩序相のパルス電場応答の異方性を利用すると、メモリー効果を再現できることが判明した。これを応用する研究を、グループを構築して開始した。

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  • Stabilization of Battery Cathode Ligand Charge Transfer Based on Non-Equilibrium Electronic Structure Analysis

    Grant number:18H03929  2018.04 - 2022.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    Uchimoto Yoshiharu

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    Grant amount:\43030000 ( Direct expense: \33100000 、 Indirect expense:\9930000 )

    We focused on the charge compensation of anions, not transition metal cations, for lithium-rich oxide cathode materials in which charge compensation of oxide ions occurs during insertion and deinsertion of lithium ions. We established a guideline for the design of materials by controlling anions. We found that oxide ions can contribute reversibly to charge compensation when either the covalent or ionic bonding between transition metal cations and oxide ions is extremely strong. Based on these results, in the field of lithium-rich materials, which have been researched and developed mainly with oxides in the past, high capacity was achieved by replacing some of the oxide ions with nitride ions.

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  • Fabrication of room-temperature multiferroic materials by rare-earth iron oxide system with triangular lattices

    Grant number:18H02057  2018.04 - 2022.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    FUJII Tatsuo

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    Grant amount:\17550000 ( Direct expense: \13500000 、 Indirect expense:\4050000 )

    RFe2O4 is expected as a next-generation multiferroic material. We attempted to synthesize its single-crystalline film by the sputtering method. As a result, the in-plane orientation of the RFe2O4 layer on the sapphire substrate rotates 30 ° depending on the presence of the Fe3O4 buffer layer. When Fe3O4 and RFe2O4 are laminated to form a multilayer film, the in-plane orientation also depends on their stacking order. In addition, when using the YSZ single crystal substrate, we succeeded in obtaining an RFe2O4 thin film that does not have twin domains and is almost completely composed of single domains.

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  • Formation of biogenic iron oxides in acid solutions, development of functions and mine-drainage treatment

    Grant number:26289261  2014.04 - 2017.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Takada Jun

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    Grant amount:\16250000 ( Direct expense: \12500000 、 Indirect expense:\3750000 )

    Treatment of acid mine drainage with acidophilic iron oxidizing bacterium and production of biogenic iron oxide minerals were investigated. The futures of iron oxides, Schwertmannite and goethite, formed under various pH and temperature conditions with an acidophilic iron oxidizing bacterium “E10” were studied. The oxides were found to exhibit high adsorption of heavy metals, As(Ⅴ), Se(Ⅵ), and Mo(Ⅵ)

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  • Induced magnetization on non-magnetic nanoparticles by surface structural relaxations

    Grant number:26630319  2014.04 - 2017.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Exploratory Research

    FUJII Tatsuo, TAKEMURA Daiki, ANDOU Daiki

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    Grant amount:\3900000 ( Direct expense: \3000000 、 Indirect expense:\900000 )

    In recent years, applications of magnetic nanoparticles in various fields are expected. We found that LaFeO3 nanoparticles having almost no magnetization in bulk form showed large magnetization at low temperatures. Therefore, it should be worth to clarify the mechanism of the induced magnetization systematically to evaluate the relationship between the crystal structure and magnetic properties of LaFeO3 nanoparticles. As a first step, we tried to prepare LaFeO3 nanoparticles with a uniform particle size distribution by using salt-assisted spray pyrolysis. The salt-assisted spray pyrolysis has been expected to synthesize complex oxide nanoparticles with single nanometric sizes.

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  • Development of functional iron titanium complex oxide films by control of mixed-valence state

    Grant number:23350092  2011.04 - 2015.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    FUJII Tatsuo, NAKANISHI Makoto, ICHIKAWA Kazunori, TAKADA Jun

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    Grant amount:\20150000 ( Direct expense: \15500000 、 Indirect expense:\4650000 )

    In this study, we synthesized a single-phase of various mixed valence oxides including a hematite - ilmenite solid solution system, and surveyed their magnetic and electronic properties. Epitaxial thin films of their oxides were fabricated successfully in order to reveal and control the effects of crystal orientation and a lattice distortion on their structural and charge transfer properties. The morphology, microstructure and electric transport properties of hematite - ilmenite solid solution films were strongly influenced by the crystalline orientation. Not only the structural anisotropy of crystalline solids but also the lattice mismatch between the substrates and films played the important roles in their properties.

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  • Study on nanometric amorphous iron oxide of bacterial origin as Li-ion battery cathode

    Grant number:23360309  2011.04 - 2014.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    TAKADA Jun, FUJII Tatsuo, NAKANISHI Makoto, KUSANO Yoshihiro, KANNO Ryouji

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    Grant amount:\18980000 ( Direct expense: \14600000 、 Indirect expense:\4380000 )

    We studied the discharge-charge properties of Li+ ions of nanometric amorphous iron oxide of bacterial origin for use as Li-ion battery cathode. This material was found to have the unique nanostructure. The iron oxide showed excellent cycle characteristics in a voltage range of 1.5-4.0 V at high current rate. X-ray absorption fine structure measurement revealed that the Fe3+ Fe2+ reaction is predominant in these discharge-charge processes.

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  • Characterization of biogenous iron oxide and its Li-ion charge/discharge behavior

    Grant number:19360300  2007 - 2008

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    TAKADA Jun

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    Grant amount:\20670000 ( Direct expense: \15900000 、 Indirect expense:\4770000 )

    バクテリア(鉄細菌)が作るチューブ状酸化鉄の特徴を詳細に検討した結果、非常にユニークな酸化鉄材料であることを明らかにした。即ち、直径が約1μmの中空チューブ状の形状で、非晶質構造を有し、3nmの1次粒子から成り、化学組成も特徴ある。さらに、この微生物由来バイオ酸化鉄はLiイオンについて優れた充放電特性を示すことを見出した。

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  • Development of hexagonal ferrite materials for electronic devices used at high frequency of GHz range on the basis of research on phase diagrams

    Grant number:17360326  2005 - 2006

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    TAKADA Jun, FUJII Tatsuo, WADA Osami, NAKANISHI Makoto, KUSANO Yoshihiro

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    Grant amount:\15400000 ( Direct expense: \15400000 )

    Some of the intrinsic properties of ferroxplaner-type ferrites are still unknown. In this study, preparation conditions, compositional range and electromagnetic properties of ferroxplanar-type ferrite were investigated and the relationships between them were clarified. And the development of novel magnetic thin films and wide-band electromagnetic wave absorbing sintered composites used in GHz range was aimed on the basis of that invesitgations.
    First, we have investigated preparation conditons for monophasic ferroxplaner-type ferrites and the phase diagrams of this system at 1000 and 1200 ℃ were constructed on the basis of the results. In this procedure, we have investigated the formation mechanisms of Y-type and Z-type ferrites by X-ray diffraction measurements and proposed the models of them. And we have clarified the relationships between the structures, electromagnetic properties like permeability and conpositions.
    Then we have investigated the preparation conditions of highly orientated magnetic thin films of ferroxplaner-type ferrites by polymerized complex method, the effects of trace elements and formation mechanisms. We have also tried to prepare wide-band electromagnetic wave absorbing materials at GHz range by hybridizing with magnetic loss and dielectric loss materials, i.e. Y-type ferrite and silicon carbide. By optimizing the preparation conditions we succeeded to prepare the absorbing materials, which showed enough reflection, less than-20dB, at the frequency range from 3.5 to 6.5 GHz. The relationship between reflection loss and band-width were thought to be trade-off, but these materials satisfy the required performace in both abilities.

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  • 微生物が常温で作るナノサイズ酸化鉄のキャラクタリゼーションとその応用の試み

    Grant number:17651071  2005 - 2006

    日本学術振興会  科学研究費助成事業  萌芽研究

    高田 潤, 藤井 達生, 中西 真

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    Grant amount:\3400000 ( Direct expense: \3400000 )

    近年鉄細菌を用いた「バイオ浄水法」は、地下水の浄水法として実際に採用され、環境に優しい浄水法と注目されていて、今後急速に全国に広がると予想されている。このバイオ浄水法では、レプトシリックス鉄細菌が地下水中のFeイオンを体内に取込んで、細菌の体の周りにパイプ状酸化鉄鞘などの無機化合物を常温で生成し、濾過槽上部に褐色沈殿物を形成する。しかし、現在この酸化鉄鞘の詳細が全く不明かつ分離・回収が困難であるため、沈殿物を埋立廃棄しているのが現状であり、バイオ浄水法の利点が十分に活かされていない。
    そこで本研究では、先ず、鉄細菌が常温で作るパイプ状鉄細菌鞘酸化鉄やそれを構成する微細な酸化鉄微粒子を詳細に検討し、酸化鉄の種類、化学組成、微細構造を調査した。次に、浄水沈殿物からの分離・回収方法と鞘の増殖条件を検討した。更にパイプ状鉄細菌鞘酸化鉄の特性と再利用を検討した。その結果、欧文誌への論文1件と特許出願1件の成果を得た。
    得られた結果を要約すると以下の通りである。
    (1)パイプ状酸化鉄鞘は中空円柱状のマイクロチューブの形態を呈し、その内径と外径の平均値はそれぞれ1.1および1.4μm、長さは50〜200μmであることが明らかとなった。鞘の壁の厚さは平均0.15μmと非常に薄い。
    (2)このパイプ状酸化鉄の結晶構造は、21-ferrihydriteの構造に似ているが、より結晶性が低いことが判明した。
    (3)パイプ状酸化鉄鞘の壁は100nm以下の超微粒子から構成されており、それぞれの微粒子の組はほぼFe:Si:P=80:15:5であることを見出した。
    (4)このパイプ状酸化鉄はspin-glass的な磁気特性を示すことが明らかになった。
    (5)バイオ浄水沈殿物からの分離・回収方法を確立し、高純度サンプルを得ることに成功した。
    (6)このパイプ状酸化鉄鞘を加熱することによって、ヘマタイトへの変化と赤色顔料としての利用の可能性を見出した。

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  • Development of new recyclable materials based on iron oxides for nano-devices

    Grant number:14350353  2002 - 2004

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    FUJII Tatsuo, TAKADA Jun, NAKANISHI Makoto

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    Grant amount:\14900000 ( Direct expense: \14900000 )

    To develop new spintronics materials with environment friendly, we prepared well-crystallized epitaxial Fe_<1.2>Ti_<0.8>O_3 films which had the largest magnetization within the hematite (α-Fe_2O_3)-ilmenite (FeTiO_3) solid solution system. The films were prepared by reactive sputtering technique with an FeTi alloy target. The precise control of substrate temperature and oxygen pressure during sputtering was necessary to obtain ferromagnetic films with R^^- symmetry, in which Fe-rich and Ti-rich layers alternately stacked along the c-axis.
    By the way it is well known that the exchange coupling between two magnetic layers influence the magnetic properties of adjacent layers. We prepared Fe_<1.2>Ti_<0.8>O_3/Fe_2O_3 bilayered films and measured the magnetic Curie temperature (T_c) of them. In spite of the higher substrate temperature of 550℃, the films had a sharp interface between layers. The T_c of bilayered films was about 220 K, which was a little higher than that (210 K) of Fe_<1.2>Ti_<0.8>O_3 single layered films. The strong magnetic coupling to the antiferromagnetic α-Fe_2O_3 layer, which had the high Neel temperature of 960 K, could increase the T_c of the Fe_<1.2>Ti_<0.8>O_3 layer.
    The electronic structures of α-Fe_2O_3-FeTiO_3 are generally considered as the mixed valence states between Fe^<2+> and Fe^<3+> due to the substitution of Fe^<3+> for Ti^<4+>. The nominal valence states of Ti are fixed to 4+. However high-resolution X-ray fluorescence spectra of various titanium oxides suggested that the Ti Kα and Kβ peak profiles of FeTiO_3 were slightly different form those of other Ti^<4+> compounds and were better to assign to have some Ti^<3+> characters. Moreover the valence band spectra of FeTiO_3 by X-ray photoelectron spectroscopy had a small density just below the Fermi edge, probably assigned to the localized Ti 3d electron.

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  • Studies on the magnetic anisotropy in single-layer films and magnetic interaction in bilayer films :

    Grant number:13650761  2001 - 2002

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    KOHMOTO Osamu, FUJII Tasuo

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    Grant amount:\2400000 ( Direct expense: \2400000 )

    1. Theoretical investigation of ferromagnetic resonance (FMR) has been done. To analyze the magnetic anisotropy, exact solution proposed by Smit and beljers and approximate solution by Kittel is known. However, equation of effective demagnetizing factors (N_x^e, N_y^e) by Kittel is not correct. We derived a new equation of N_x^e and H_y^e and we obtained resonance equation for thin films. By this derivation method, the resonance equations of thin films having a uniaxial or a fourfold anisotropy are obtained when a static field is rotated in the film plane, six arrangements are calculated : (1) perpendicular anisotropy, (2) in-plane anisotropy, (3) cubic-crystal (001) face, (4) cubic-crystal (011) face, (5) cubic-crystal (111) face, and (6) oblique anisotropy films.
    2. Magnetic anisotropy of Co and Ni films and magnetoresistance of bilayer films of Ni/NiO and NiFe/NiO has been experimentally studied. (1) In single layer Ni films, a large perpendicular anisotropy field was observed by FMR.
    (2) In Co films, Perpendicular anisotropy field increases with decreasing the thickness.
    (3) In bilayer Ni/NiO and NiFe/NiO films, magetoresistance was studied.

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  • インテグレーション超高周波デバイス用新規プラナ型フェライト薄膜の開発

    Grant number:13025231  2001

    日本学術振興会  科学研究費助成事業  特定領域研究(A)

    藤井 達生, 中西 真, 高田 潤

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    Grant amount:\2100000 ( Direct expense: \2100000 )

    電子通信機器の小型化・高性能化にともない、高い周波数帯域で優れた高周波磁気特性を有する磁性薄膜の開発が切望されている。しかし、スピネル型フェライトに代表される従来の磁性材料は、高周波で透磁率が急激に低下し使用できない。我々の研究グループでは、理論的に優れた高周波磁気特性を持つことが期待されるプラナ型フェライトに注目し、その薄膜の作製に世界ではじめて成功した。その特徴は、金属イオンが均一に分散固定される錯体重合法を用いて原料溶液を調製し、コーティング法により薄膜を作製した点である。そこで本研究では、プラナ型フェライト薄膜のグローバルインテグレーションを目標に、1.薄膜の膜質向上(平滑性・クラック等)を目的として、原料溶液組成の検討2.薄膜の焼成温度の低温化を目的として、基板材料の検討を行った。
    その結果、平滑かつクラックの無いプラナ型フェライト薄膜の作製のためには、原料溶液の混合比を、金属:クエン酸:エチレングリコール=1:4:12とすること、溶液のpHはpH<1とすること、そして粘度については10mPa・s以下とすることを明らかにした。また、種々の貴金属基板上に成膜した結果、プラナ型フェライト(Y型六方晶フェライト)の結晶化には、一般的に1000℃以上の高温焼成が必要とされるが、Ag基板を用いたときのみ特異的に結晶化温度が低下し、800℃の低温においてプラナ型フェライト薄膜が成長することを見出した。
    得られたプラナ型フェライト薄膜の高周波磁気特性を評価し、改善することが今後の課題である。

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  • Preparation of Electromagnetic wave absorber Barium Ferrites for Electromagnetic Environment by liquid State Reaction

    Grant number:12450269  2000 - 2002

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    YOSHIO Tetsuo, FUJII Tatsuo, TAKADA Jun, NAGAE Masahiro

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    Grant amount:\14900000 ( Direct expense: \14900000 )

    In the present study, we tried the synthesis of Y-type Ba-hexaferrite expected as an electromagnetic wave absorber by the glass ceramic method. The results are summarized as follows.
    The glasses with composition of 0.1MO[xB_2O_3・yBaO・(1-x-y)Fe_2O_3] were prepared and the precipitation process of Y-type Ba-hexaferrite from the glass matrix was investigated. Y-type Ba-hexaferrite particles were precipitated by heating the glass at temperatures between 820℃ and 1100℃. Based on these results, hexagonal platelets of Y-type Ba-hexaferrite with fairly uniform dimension were obtained as precipitates from the glass matrix by leaching with a dilute HCl solution. The low-temperature formation of Y-type Ba-hexafcrrite was due to a reaction between M-type Ba-ferrite and liquid phase. Substitutional solid solutions of Y-type Ba-hexaferrite (Ba_2Zn_<2-x>Co_xFe_<12>O_<22>) were obtained in all composition range. These Y-type Ba-hexaferrite solid solutions showed electromagnetic absorption spectra at frequency range of 8 to 9 GHz.

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  • Controlled spin-polarized electron transport of oxide magnetic semiconductor films of hematite-ilumenite solid solutions by the exchange coupling

    Grant number:11650697  1999 - 2001

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    FUJII Tatsuo, NAKANISHI Makoto, TAKADA Jun

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    Grant amount:\3500000 ( Direct expense: \3500000 )

    Magnetic semiconductors are one of die promising electronics materials for the next generation, so-called spintronics materials. In this research we proposed a novel technique to control the spin-polarized transport of magnetic semiconductors and tried to realize it. The first subject was to develop thin films of new oxide magnetic semiconductors focused on a hematite-ilumenite solid solution system having a high spin polarization at room temperature. There had been many difficulties to prepare well-defined hematite ilumenite solid solution films having good magnetic semiconductive properties, because they had many controllable factors such as an order-disorder transition and Fe^<2+>/Fe^<3+> mixed valence states, etc. We found optimized preparation conditions for the solid solution films by helicon sputtering to control remanent oxygen pressure and substrate temperature precisely. The films showed magnetic semiconductive properties such as magnetoresistance at room temperature. The second subject was to control magnetic structures of ferromagnetic layers by means of a spin-flip transition of antiferromagnetic layers. Only epitaxial hematite films showed a unique spin-flip transition. We prepared hematite/spinel ferrite bilayered films by helicon sputtering and surveyed magnetic properties around the spin-flip transition. The spin-flip transition in a hematite layer disappeared because of a large in-plane magnetic anisotropy of a spinel ferrite layer. We first found the 90° exchange coupling between oxide magnetic layers. Unfortunately we could not realize the proposing spin control technique, but we could obtain huge results concerning preparation techniques for well-defined iron oxide films and their structural, magnetic and electronic properties.

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  • A Study of Magnetic Interaction Between Magnetic Layers in Laminated Films

    Grant number:10650691  1998 - 1999

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    KOHMOTO Osamu, FUJII Tatsuo

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    Grant amount:\1100000 ( Direct expense: \1100000 )

    Four types of the magnetic films has been studied.
    (1) Single-layer Ni Films : Dependencies of the saturation magnetization, coercive force remanence ratio and perpendicular magnetic anisotropy in sputtered Ni films on the film thickness (100 and 300 nm) and Ar pressure (3-50 mTorr) have been studied.
    (2) Single-layer Ni-O films prepared by sputtering in Ar+OィイD22ィエD2 atmosphere : Single phase NiO films are obtained below the oxygen partial pressure (OィイD22ィエD2/(Ar+OィイD22ィエD2)) of 9%. Lattice constant (a) and axis angle (α) of the Ni-O films have been studied. With increase in OィイD22ィエD2 pressure, the two values of a and α become close to those of the bulk. Saturation magnetization, coercive force, remanence ratio and electrical resistivity (ρ) has been studied. The NiO films are not stoichiometric composition. Oxygen deficient value (γ) in NiィイD21-γィエD2O decrease rapidly with annealing temperature. With decreasing γ, the electrical resistivity increases rapidly from 6x10ィイD1-1ィエD1 to 10ィイD14ィエD1 μΩcm.
    (3) Layered Ni/NiO films : Sifted MH loops are observed in bilayered films. With increase in NiO layer thickness, exchange field(HィイD2exィエD2) coercive force (HィイD2cィエD2) and magetoresistance (Δρ/ρ) increases. HィイD2exィエD2 increase with decrease in the Ni layer thickness. With increase in the NiO layer thickness, the Ni layer thickness at which the field of appearing HィイD2exィエD2 increases.
    (4) Layered Ni/Cu/Ni/NiO films : Shifted and asymmetrical MH loops have been observed. The latter indicated two ferromagnetic Ni layers have been surely separated by the Cu layer. HィイD2exィエD2 and HィイD2cィエD2 tend to increase with Cu layer thickness.

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  • Development of Novel Electromagnetic-Wave-Absorber of SiC-Ferrite Hybrid Materials

    Grant number:10450250  1998 - 1999

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    TAKADA Jun, TOMII Yoichi, NAKANISHI Makoto, FUJII Tatsuo, YAMAMOTO Shigehisa

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    Grant amount:\13700000 ( Direct expense: \13700000 )

    First, We firmed the experimental technique and evaluation of the electromagnetic properties concerning with wave-absorption by using an network analyzer for frequency range from 100MHz to 10GHz. Next two different types of novel sintered composites of Ni-Zn ferrite SiC were first succeeded to prepare as an electromagnetic-wave-absorber through a soft chemical technique and subsequent tow different manners of sintering : a two-step sintering and an one-step sintering. Amorphous SiC particles with an average diameter of approximately 30 μm dispersed uniformly in Ni-Zn spinel ferrite matrix. In the two-step-sintering method, the density of the composite decreased continuously as the amount of SiC increased. The absorption characteristics of the sintered composite were found to depend upon the amount of SiC particles. The center frequency of the absorption shifted toward higher frequency around 2GHz. Furthermore in the one-step-sintering method, we first succeeded another new electromagnetic-wave-absorber having interesting wave-absorption properties with the two different center frequencies of about 800MGz and 8.6GHz.

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  • Bi系高温超伝導酸化物のLiのインターカレーションと二次電池正極材への応用の試み

    Grant number:09875172  1997 - 1998

    日本学術振興会  科学研究費助成事業  萌芽的研究

    高田 潤, 武田 保雄, 中西 真, 藤井 達生

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    Grant amount:\1900000 ( Direct expense: \1900000 )

    Bi系高温超伝導酸化物(Bi-2212相など)は層状構造を有する化合物であり、これまで電極反応によるLiのインターカレーションの可能性が期待されていたが、現在まで殆ど報告例がない。
    本研究は、Bi-2212相へ電気化学的にLiを導入することを試み、得られたBi-2212相の超伝導特性、構造及び酸素量と構成イオンの価数変化を明らかにするとともに、固相反応法によるLi導入の結果と比較検討することにより、Liのインタカレーションの特徴を明らかにし、更にLiディインターカレーションを試みることによって、Bi-2212相がLi二次電池の正極材として応用できる可能性を検討することを目的とした。得られた結果を要約すると以下の通りである。
    1. 電気化学的手法を用いれば、LiをBi-2212相に常温・常圧でインターカレートすることが可能であり、Li量の制御は極めて容易であることを明らかにした。
    2. Liを電気化学的に導入したBi-2212相の超伝導特性Toは、Li量によって大巾に変化することを初めて見い出した。すなわち、少量のLi導入でTcは85Kから93Kまで上昇した後、急激に低下し、X≧0.3(Li_X Bi_2Sr_<1.6> Ca_<1.5> Cu_2O_zの表記に対して)のLi量で非超伝導体となる。
    3. 電気化学的Li導入では固相反応の場合とは全く異なり、酸素量は全く変化せず、Biの平均価数が減少する結果、Cuの平均価数がX≧0.3.で+2.0まで減少し、これがTcの著しい変化の原因であることを明らかにした。
    4.予め導入したLiは電気化学的な逆反応(放電反応)によって、Bi-2212相より放出できる、すなわちディインターカレーションが可能であることを初めて見い出した。このディインターカレーションによって、Bi-2212相の構造、超伝導特性、酸素量とBiとCuの平均価数は可逆的に変化することを明らかにした。
    5. 以上の結果より、Bi-2212相へのLi二次電池の正極材への応用の可能性は極めて高いことを示した。

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  • In situ Raman分光法による酸化鉄薄膜の構造解析とスピン構造

    Grant number:09740524  1997 - 1998

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    藤井 達生

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    Grant amount:\2100000 ( Direct expense: \2100000 )

    本研究者は、数年前、α-Al_2O_3単結晶基板上に成長したエピタキシャルα-Fe_2O_3薄膜のスピン構造が、バルク結晶のものと大きく異なっており、温度により膜面内から垂直方向へと興味あるスピンフリップ転移を示すことを見出し、注目された。この原因として、α-Fe_2O_3薄膜の成長過程に由来する格子歪みの発生が考えられる。本研究では成摸時にin situ Raman分光測定を行い、エピタキシャルα-Fe_2O_3薄膜の薄膜成長過程における構造変化を、連続的にとらえることを試みた。しかし、昨年度に引き続きRaman分光装置の光学系の改善を試みたが、膜厚が数原子層程度しかない超薄膜のRamanスペクトルを測定することはできず、薄膜成長初期の構造変化をとらえることには残念ながら成功しなかった。
    またその研究と並行して、活性化反応性蒸着法によりα-Al_2O_3(001)単結晶基板上にFeTiO_3-α-Fe_2O_3固溶体のエピタキシャル薄膜を作製した。基板温度500℃の低温で成膜した薄膜は、FeイオンとTiイオンが陽イオンサイトをランダムに占有したコランダム構造であった。一方、基板温度700℃で成膜したFe_<2-x>Ti_xO_3膜は、x≧0.4の組成範囲でFeイオンとTiイオンが規則的に配列したイルメナイト構造をとった。FeイオンとTiイオンか規則配列した薄膜のみかフェリ磁性を示した、しかしその自発磁化はイオンが完全に規則配列した場合に期待される値の半分以下であった。さらに、固溶体薄膜の比抵抗は、Fe^<2+>-Fe^<3+>イオンの混合原子価状態をとることにより10^<-1>Ωcmまで低下した。よって本系固溶体薄膜は、新しい酸化物磁性半導体薄膜の有力な候補となることを明らかにした。

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  • Preparation and Properties of New Mo-based Alloys Strengthened by Dispersion of Nano-scale Nitride Superfine Particles

    Grant number:08455311  1996 - 1997

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    TAKADA Jun, NAKANISHI Makoto, FUJII Tatsuo, HIRAOKA Yutaka

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    Grant amount:\7400000 ( Direct expense: \7400000 )

    Mo alloys, which are known to be one of high melgin-temperature metals, are used as high-temperature materials such as heaters, trays for heat-treatments and a X-ray target. Further wide use requires high strengthening of the alloys.
    The present research aims to harden a Mo-nitride surface layr formed by nitriding and also to strengthen the alloy by precipitation of very fine TiN particles dispersed in Mo matrix through preferred nitriding of dilute Mo-Ti alloys. Especially on the basis of basic and systematic investigations we tried to develop a new Mo-based composities in which a great number of nano-scale TiN superfine particles disperse through nitriding at much lower temperatures thatn those so far. As a result, it is quite lucky for us to succeed the development of a new Mo-based composite material having remarkably higher strength in comparison with any materials used at present.
    For Mo-0.5 and 1.0wt% alloys and pure Mo nitrided in a NH_3 gas at 1100゚C which is much lower than 1300-1500゚C in previous works, nitriding behavior, hardness profiles on cross sections of nitrided specimens, and microstructure and crystallographic relationship of fine Ti-nitride particles in the Mo matrix were discussed. Main results are summarized below.
    (1) The growth mechanism of the Mo-nitride surface layr was made clear. A maximum hardness was found to reach Hv=1800. Furthermore, the surface layr was found to consist of two different sublayrs : a gamma-Mo_2N sublayr near the specimen surface and a beta-Mo_2N sublayr beneath the gamma-Mo_2N layr. Each sublayr has a different twin. In particular, the formation of a new type of microtwin was found in the beta-Mo_2N sublayr.
    (2) In nitrided Mo-Ti alloys an internal nitriding layr having high strength was formed beneath the Mo_2 surface layr. The formation of the internal nitriding layr was not observed in pure Mo. We attained markedly high hardness of Hv=1000, which is twice a maximum hardness of Hv=500 reported in Mo alloys so far. Moreover, we found first in the world that the nitriding at the very low temperature of 1100゚C brought the precipitation of nano-scale TiN superfine particles with a thickness of about 0.45nm (=1 unit length of TiN) and a diameter of 2-4nm. The superfine particles formed were found to have a special crystallographic-relationship and to give the great increase in strength.

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  • Magnetic and Optical properties of artifical superlattice

    Grant number:05453079  1993 - 1994

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for General Scientific Research (B)

    MIURA Yoshinari, FUJII Tatsuo, OSAKA Akiyoshi

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    Grant amount:\7100000 ( Direct expense: \7100000 )

    Magnetic superlattices including ferromagnetic and diamagnetic layrs bring interesting properties such as the giant magnetoresistance and the mangneto-optical effects. On the other hand, it is well known that titanium oxides change their properties sensitively with their metal to oxygen ratios.
    Fe_3O_4/Mo (M=Mg, Co) superlattice films having various thickness combinations of the individual Fe_3O_4 and Mo were prepared by an activated reactive evaporation (ARE) method. Stoichiometric and monstoichiometric titanium oxide films were also epitaxially formed on alpha-Al_2O_3 (0001) substrates by ARE method. The summarized results are as follows :
    1. Epitaxial growths and artificial modulations of (111) -and (100) -orientated Fe_3O_4/Mgo films deposited on (0001) -faced alpha-Al_2O_3 and (100) -faced Mgo single crystaline substrates, respectively, were confirmed. The saturation magnetization of each film at 5K was about 85-100 emu/g, being nealy consistent with that of the Fe_3O_4 bulk. However, with increasing temperature the magnetizations decreased linearly in proportion to 1/T below 40K.
    2. For Fe_3O_4/CoO film the lattice spacing along the growth direction was contracted for the CoO layr but expanded for the Fe_3O_4 layr probably due to the lattice mismatch between these layrs. The magnetostriction of CoO layrs induced in-plane and perpendicular magnetic anisotropy in (100) -and (111) -oriented superlattices, respectively. Strong magnetic coupling between Fe_3O_4 and CoO layrs made the Neel temperature of the CoO layr higher and showed the ferrimagnetic/antiferromagnetic exchange anisotropy.
    3. Titanium di-and sesquioxide films were epitaxially grown on (0001) alpha-Al_2O_3. Films prepared at Po_2*2.0*10^<-4> Torr were stoichiometric (100) -oriented rutile of TiO_2. AtP_<02>=0.6*10^<-4> Torr, on the other hand, (001) -oriented Ti_2O_3 was formed and an electrical transition was clearly detected at about 400K.

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  • スパッタ法による歪み酸化鉄薄膜の磁気光学特性

    Grant number:05855130  1993

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    藤井 達生

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    Grant amount:\1200000 ( Direct expense: \1200000 )

    rfマグネトロンスパッタ法を用い、サファイア(alpha-Al_2O_3)単結晶基板上に酸化鉄(alpha-Fe_2O_3)薄膜を作製した。酸化鉄(alpha-Fe_2O_3)は約250Kにモ-リン転移と呼ばれるスピン相転移を持ち、その前後でスピン軸がc面内からc軸方向へと90°変化することが知られている。しかし、単結晶基板上に成長した酸化鉄薄膜の場合は、基板界面におけるミスフィットが結晶格子に歪みを与える結果、スピン相転移はそのスピン軸、転移温度ともバルクに比べ、異なった振舞を示すことが期待される。
    alpha-Al_2O_3(102)単結晶基板上にエピタキシャル成長したalpha-Fe_2O_3(102)について、メスバウアー分光測定を行なった結果、スピン転移温度は400Kへと大きく上昇しており、しかもスピン軸はc軸から<102>方向へと変化していた。そこで4軸回折計による薄膜のX線構造解析を試みた結果、a軸長は約0.5%減少し、一方、c軸長は約0.2%増加していた。一方、alpha-Al_2O_3(001)単結晶基板上にエピタキシャル成長したalpha-Fe_2O_3(001)について、メスバウアー分光測定及びX線構造解析を行なった結果、スピン相転移は極低温(2K)に至まで観測されず、逆にa軸長が約0.3%増加し、c軸長が約0.5%減少していた。従って、得られた酸化鉄薄膜のスピン相転移の変化は、異方的な歪みが原因で生じたものと推論できる。得られた薄膜の磁気光学特性については、現在まだ検討中である。

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  • Preparation of Fact-Ion Conductive Thin Films as nano-sized Battery Electrolytes

    Grant number:04650705  1992 - 1993

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for General Scientific Research (C)

    OSAKA Akiyoshi, FUJII Tatsuo, NANBA Tokurou

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    Grant amount:\1870000 ( Direct expense: \1870000 )

    The present research was exploited based on a demand for developing optical memory materials and electrolytes for fine scale solid batteries. Thin films of the systems F-O-Si-Pb and CuI-MoO_4-P_2O_5 were prepared with an rf-sputtering technique and their microstructure, electrical conductivity and phase change due to laser irradiation.
    1. Amorphous thin films of the system F-O-Si-Pb
    Amorphous thin films of the system F-O-Si-Pb were rf-sputtered under the conditions : the Ar chamber pressure : 0.06-0.07 Torr, rf-power : 100W, sputtering time : 45min. X-ray photoelectron spectra showed that the fluorine atoms were homogeneously distributed in the films but the ratio F-Si/F-Pb decreased in the direction from the surface to the film-substrate interface. The results were accounted for by an increase in non-bridging oxygen due to a reaction Si-O-Si->Si-F+Si-O^-. Irradiation of 3mW He-Ne laser beam (lambda=632.8nm) for 1/500s induced crystallization of a quartz in the area of 11mum radium, independent of the fluorine content, but not induced an expected PbF2 phase of high conductivity. Fluorine ionic conductivity obeyed an Arrhenius type temperature dependence with sigma=1.1x10-5 S/cm at 500K, two orders of magnitude larger than the corresponding bulk glass, and activation energy of 106.5kJ/mol.
    2. Amorphous thin films of the system CuI-MoO_4-P_2O_5
    A target of a composition 25CuI・25Cu_2O・25MoO_4・25Cu_3(PO_4)_3 was rf-sputtered with the same conditions above to prepare amorphous films. They had a particular microstructure and were insulators below 550K with conductivity as small as 10^<-8> S/cm. The increase in the rf-power grew cubic particles of gamma-CuI while a large fraction of Cu atoms were divalent. The laser irradiation dug holes of 8mum in diameter even at 1/500 s and the holes grew to 12 at 1s irradiation, whereas no crystallization was observed.

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