Organization
Faculty of Education Professor
Position
Professor
External link
ITOH Keiji
Degree
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Doctor of Science ( Niigata University )
Research Interests
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Neutron Scattering
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中性子散乱
Research Areas
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Energy Engineering / Quantum beam science
Professional Memberships
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日本金属学会
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日本物理学会
Papers
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Deuterium occupation of interatomic hole sites in Ni 67Zr33 amorphous alloy Reviewed International coauthorship
Journal of Alloys and Compounds 961 171094 2023.10
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Local lattice deformation and site-specific deuterium distribution in α-VD0.75: Insights from atomic-scale probes Reviewed
K. Itoh, K. Ohara, K. Ikeda, T. Otomo
Journal of Alloys and Compounds 1048 185305 - 185305 2025.12
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Network structure and cation environment in Ag2S-GeS2 glasses Reviewed
Keiji Itoh
Next Research 1 ( 2 ) 100049 - 100049 2024.12
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Deuterium occupation of interatomic hole sites in Ni67Zr33 amorphous alloy Reviewed
K. Itoh, J. Saida, E.R. Barney, A.C. Hannon
Journal of Alloys and Compounds 961 171094 - 171094 2023.10
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Structural study of Li2S-GeS2 glasses: Ge S network and local environment of Li Reviewed
Keiji Itoh
Solid State Ionics 383 115986 - 115986 2022.10
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Atomic-level characterization of free volume in the structure of Cu67Zr33 amorphous alloy Reviewed
K Itoh, R Yamada, J Saida, K Ikeda, T Otomo
Journal of Physics: Condensed Matter 33 ( 27 ) 274001 - 274001 2021.7
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Yuki Shibazaki, Rui Yamada, Junji Saida, Yoshio Kono, Masato Wakeda, Keiji Itoh, Masahiko Nishijima, Koji Kimoto
Communications Materials 1 ( 1 ) 2020.12
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Structural study of Ni<inf>67</inf>Zr<inf>33</inf> amorphous alloy: Interatomic space analysis approach Reviewed
K. Itoh, J. Saida, T. Otomo
Materials Chemistry and Physics 240 122214 2020
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Free volume distribution and structural inhomogeneity in Ni50V50 amorphous alloy Reviewed
K. Itoh, Y. Yoshioka, E.R. Barney, A.C. Hannon
Journal of Alloys and Compounds 770 350 - 355 2019.1
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Mechanochemical synthesis of binary phosphorus telluride: Short range structure and thermal properties Reviewed
K. Itoh, Y. Mizuhara, T. Otomo
Journal of Solid State Chemistry 267 119 - 123 2018.11
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Inhomogeneity of local packing density and atomic bonding of Ni67Zr33 amorphous alloy Reviewed
K. Itoh, J. Saida, T. Otomo
JOURNAL OF ALLOYS AND COMPOUNDS 732 585 - 592 2018.1
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Structural study of GeS 2 glass: Reverse Monte Carlo modelling for edge-sharing tetrahedral network Reviewed
Keiji Itoh
Journal of Physics and Chemistry of Solids 103 109 - 115 2017.4
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Structure of Se-Te glasses studied using neutron, X-ray diffraction and reverse Monte Carlo modelling Reviewed
Keiji Itoh
JOURNAL OF SOLID STATE CHEMISTRY 246 372 - 378 2017.2
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Short- and medium-range order in Sb–Se glasses Reviewed
Keiji Itoh
Journal of Solid State Chemistry 233 368 - 373 2016.1
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Neutron Diffraction Study of Isotope Enriched Glassy Sm4Ti9O24 Reviewed
Kenji Maruyama, Yasutomo Arai, Satoshi Sato(Hiroi, Mayumi Sanada, Toshiya Otomo, Kentaro Suzuya, Keiji Itoh
JPS Conference Proceedings 8 031007 2015
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Y. Iwadate, T. Ohkubo, T. Michii, H. Matsuura, A. Kajinami, K. Takase, N. Ohtori, N. Umesaki, R. Fujita, K. Mizuguchi, H. Kofuji, M. Myochin, M. Misawa, K. Itoh, T. Fukunaga
Molten Salts Chemistry and Technology 449 - 458 2014.5
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Mössbauer study of the SmFe 2 hydride through 149Sm and 57Fe Reviewed
Ryo Masuda, Takaya Mitsui, Keiji Itoh, Yasuhiro Kobayashi, Shinji Kitao, Makoto Seto
Journal of the Physical Society of Japan 81 ( 3 ) 2012.3
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An in situ Mössbauer study using synchrotron radiation Reviewed
Ryo Masuda, Takaya Mitsui, Keiji Itoh, Kouji Sakaki, Hirotoshi Enoki, Yumiko Nakamura, Makoto Seto
Hyperfine Interactions 204 ( 1-3 ) 139 - 142 2012.3
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Atomic structure of nanoscale quasicrystal-forming Zr-noble metal binary metallic glasses Reviewed
J. Saida, K. Itoh, T. Sanada, S. Sato, M. Imafuku, M. Ohnuma, A. Inoue
Journal of Alloys and Compounds 509 ( 1 ) S27 - S33 2011.7
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Anomalous aggregation state of deuterium molecules in the nanoscale pores of a metal organic framework Reviewed
Izuru Kanoya, Terumi Furuta, Ryogo Sakamoto, Mitsuya Hosoe, Masao Ichikawa, Keiji Itoh, Toshiharu Fukunaga
Journal of Applied Physics 108 ( 7 ) 2010.10
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Crystal Structure of Li7P3S11 Studied by Neutron and Synchrotron X-ray Powder Diffraction Reviewed
Onodera Yohei, Mori Kazuhiro, Otomo Toshiya, Hannon Alex C, Kohara Shinji, Itoh Keiji, Sugiyama Masaaki, Fukunaga Toshiharu
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 79 87 - 89 2010.1
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Ionic conductivity and structural properties of lithium lanthanum titanate quenched into liquid nitrogen studied by neutron powder diffraction Reviewed
Kazuhiro Mori, Kenji Iwase, Masao Yonemura, Joan Siewenie, Thomas Proffen, Yohei Onodera, Keiji Itoh, Masaaki Sugiyama, Takashi Kamiyama, Toshiharu Fukunaga
Journal of the Physical Society of Japan 79 84 - 86 2010
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SAXS and SANS observations of abnormal aggregation of human •-crystallin Reviewed
Masaaki Sugiyama, Norihiko Fujii, Yukio Morimoto, Keiji Itoh, Kazuhiro Mori, Toshiharu Fukunaga, Noriko Fujii
Chemistry and Biodiversity 7 ( 6 ) 1380 - 1388 2010
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Newly designed neutron diffraction cell for fluids at high temperatures and high pressures Reviewed
Hiroki Iwase, Nobuyuki Matubayasi, Yasuo Kameda, Keiji Itoh, Toshiya Otomo, Masaru Nakahara
Japanese Journal of Applied Physics 49 ( 1 ) 2010
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SANS investigation of assembly state of proteasome activator 28 and the 20S proteasome Reviewed
Masaaki Sugiyama, Eiji Kurimoto, Hiroki Sahashi, Eri Sakata, Yukio Morimoto, Keiji Itoh, Kazuhiro Mori, Toshiharu Fukunaga, Yasufumi Minami, Koichi Kato
Journal of Physics: Conference Series 247 2010
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Microstructure of hydrogenated Mg2Ni studied by SANS Reviewed
K. Mori, M. Sugiyama, K. Iwase, S. Kawabe, Y. Onodera, K. Itoh, T. Otomo, T. Fukunaga
Journal of Physics: Conference Series 247 2010
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Ionic conductivity and structural properties of lithium lanthanum titanate quenched into liquid nitrogen studied by neutron powder diffraction Reviewed
K. Mori, K. Iwase, M. Yonemura, J. Siewenie, T. Proffen, Y. Onodera, K. Itoh, M. Sugiyama, T. Kamiyama, T. Fukunaga
Journal of the Physical Society of Japan 79 ( SUPPL. A ) 84 - 86 2010
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Assembly State of Proteasome Activator 28 in an Aqueous Solution as Studied by Small-Angle Neutron Scattering
Masaaki Sugiyama, Eiji Kurimoto, Yukio Morimoto, Hiroki Sahashi, Eri Sakata, Kei Hamada, Keiji Itoh, Kazuhiro Mori, Toshiharu Fukunaga, Yasufumi Minami, Koichi Kato
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 78 ( 12 ) 2009.12
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Heating rate dependence of Tg and Tx in Zr-based BMGs with characteristic structures Reviewed
E. Matsubara, T. Ichitsubo, K. Itoh, T. Fukunaga, J. Saida, N. Nishiyama, H. Kato, A. Inoue
Journal of Alloys and Compounds 483 ( 1-2 ) 8 - 13 2009.8
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Structural study on Zr0.39Ni0.61 and (Zr0.39Ni0.61)D0.59 amorphous alloys by neutron and X-ray diffraction Reviewed
K. Itoh, T. Watanabe, T. Otomo, M. Sugiyama, K. Mori, T. Fukunaga
Journal of Alloys and Compounds 483 ( 1-2 ) 213 - 216 2009.8
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Structural investigation on supercritical carbon dioxide and its mixture with alcohol Reviewed
Takashi Sato, Masaaki Sugiyama, Masakatsu Misawa, Kei Hamada, Keiji Itoh, Kazuhiro Mori, Toshiharu Fukunaga
Journal of Molecular Liquids 147 ( 1-2 ) 102 - 106 2009.7
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Crystal structure of Fe-doped lanthanum gallate for oxygen partial pressures studied by neutron powder diffraction Reviewed
Kazuhiro Mori, Ryoji Kiyanagi, James W. Richardson Jr., Joe Fieramosca, Yohei Onodera, Keiji Itoh, Masaaki Sugiyama, Takashi Kamiyama, Toshiharu Fukunaga
Solid State Ionics 180 ( 6-8 ) 541 - 545 2009.5
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Structure-property relationships of fast copper ion conductor cubic CuI Reviewed
D. S. Adipranoto, F. Shikanai, M. Yonemura, K. Mori, J. G. Park, K. Itoh, T. Kamiyama
SOLID STATE IONICS 180 ( 6-8 ) 492 - 496 2009.5
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Structure of Na2S-GeS2 glasses studied by using neutron and X-ray diffraction and reverse Monte Carlo modeling Reviewed
Keiji Itoh, Toshiharu Fukunaga
Solid State Ionics 180 ( 4-5 ) 351 - 355 2009.4
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Structural study of amorphous LaNi5Dx: In situ neutron and X-ray diffraction experiments in deuterium gas Reviewed
K. Itoh, T. Shoumura, M. Sugiyama, K. Mori, T. Fukunaga
Journal of Alloys and Compounds 474 ( 1-2 ) 4 - 8 2009.4
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SANS simulation of aggregated protein in aqueous solution Reviewed
Masaaki Sugiyama, Kei Hamada, Koichi Kato, Eiji Kurimoto, Kenta Okamoto, Yukio Morimoto, Susumu Ikeda, Sachio Naito, Michihiko Furusaka, Keiji Itoh, Kazuhiro Mori, Toshiharu Fukunaga
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 600 ( 1 ) 272 - 274 2009.2
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Structural and electrochemical properties of La0.8Sr0.2Ga1-xFexO3 Reviewed
Kazuhiro Mori, Yohei Onodera, Ryoji Kiyanagi, James W. Richardson Jr., Keiji Itoh, Masaaki Sugiyama, Takashi Kamiyama, Toshiharu Fukunaga
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 600 ( 1 ) 328 - 331 2009.2
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Comprehensive structural study of glassy and metastable crystalline BaTi<inf>2</inf>O<inf>5</inf>
Jianding Yu, Shinji Kohara, Keiji Itoh, Shunsuke Nozawa, Satoru Miyoshi, Yasutomo Arai, Atsunobu Masuno, Hiraki Taniguchi, Mitsuru Itoh, Masaki Takata, Toshiharu Fukunaga, Shin Ya Koshihara, Yoshihiro Kuroiwa, Shinichi Yoda
Chemistry of Materials 21 ( 2 ) 259 - 263 2009.1
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Chemically oxidized γ-MnO2 for lithium secondary batteries: Structure and intercalation/deintercalation properties Reviewed
Won Il Jung, Miki Nagao, Cédric Pitteloud, Keiji Itoh, Atsuo Yamada, Ryoji Kanno
Journal of Materials Chemistry 19 ( 6 ) 800 - 806 2009
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Structure of Mg50Ni50 amorphous alloy studied by using X-ray diffraction and reverse Monte Carlo modelling Reviewed
K. Itoh, T. Otomo, M. Sugiyama, K. Mori, T. Fukunaga
Journal of Physics: Conference Series 144 2009
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Evaluation of the local environment for nanoscale quasicrystal formation in Zr80Pt20 glassy alloy using Voronoi analysis Reviewed
Junji Saida, Keiji Itoh, Shigeo Sato, Muneyuki Imafuku, Takashi Sanada, Akihisa Inoue
Journal of Physics Condensed Matter 21 ( 37 ) 2009
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Pulsed neutron diffraction study of NaNO2 and KNO2 pure melts Reviewed
Yasuhiko Iwadate, Takumi Harada, Takahiro Ohkubo, Kazuko Fukushima, Masakatsu Misawa, Toshiharu Fukunaga, Keiji Itoh
Electrochemistry 77 ( 8 ) 741 - 744 2009
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Structural difference between liquidlike and gaslike phases in supercritical fluid Reviewed
Takashi Sato, Masaaki Sugiyama, Keiji Itoh, Kazuhiro Mori, Toshiharu Fukunaga, Masakatsu Misawa, Toshiya Otomo, Shinichi Takata
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 78 ( 5 ) 2008.11
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Partial pair correlation functions of low-density supercritical water determined by neutron diffraction with the H/D isotopic substitution method Reviewed
Toshiya Otomo, Hiroki Iwase, Yasuo Kameda, Nobuyuki Matubayasi, Keiji Itoh, Susumu Ikeda, Masaru Nakahara
Journal of Physical Chemistry B 112 ( 15 ) 4687 - 4693 2008.4
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A new analysing approach for the structure of density fluctuation of supercritical fluid Reviewed
T. Sato, M. Sugiyama, M. Misawa, S. Takata, T. Otomo, K. Itoh, K. Mori, T. Fukunaga
Journal of Physics Condensed Matter 20 ( 10 ) 2008.3
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The structure of manganese dioxide and position of proton studied by neutron diffraction with isotopic substitution Reviewed
Cédric Pitteloud, Miki Nagao, Keiji Itoh, Ryoji Kanno
Journal of Solid State Chemistry 181 ( 3 ) 467 - 472 2008.3
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Structural evolution of human recombinant αB-crystallin under UV irradiation Reviewed
Masaaki Sugiyama, Noriko Fujii, Yukio Morimoto, Sakie Kurabayashi, Martin E. Vigild, Tatsuo Nakagawa, Takashi Sato, Keiji Itoh, Kazuhiro Mori, Toshiharu Fukunaga
Biomacromolecules 9 ( 2 ) 431 - 434 2008.2
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Structural study of (Li2S)(50)(GeS2)(50) glass by X-ray and neutron diffraction Reviewed
Keiji Itoh, Masashi Sonobe, Masaaki Sugiyama, Kazuhiro Mori, Toshiharu Fukunaga
JOURNAL OF NON-CRYSTALLINE SOLIDS 354 ( 2-9 ) 150 - 154 2008.1
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Characterization of hydrogen absorption/desorption states on lithium-carbon-hydrogen system by neutron diffraction Reviewed
Hiroki Miyaoka, Keiji Itoh, Toshiharu Fukunaga, Takayuki Ichikawa, Yoshitsugu Kojima, Hironobu Fuji
Journal of Applied Physics 104 ( 5 ) 2008
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Refractive index calculation using the structural properties of La 4Ti9O24 glass Reviewed
Yasutomo Arai, Keiji Itoh, Shinji Kohara, Jianding Yu
Journal of Applied Physics 103 ( 9 ) 2008
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回折実験とモデルからみた金属ガラスの構造
福永俊晴, 伊藤恵司, 大友季哉
まてりあ 47 17 - 22 2008
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Phonon dispersion of metallic glass CuZr2 Reviewed
S. Nakashima, Y. Kawakita, T. Otomo, R. Suenaga, R. Baron, S. Tsutsui, S. Kohara, S. Takeda, K. Itoh, H. Kato, T. Fukunaga, M. Hasegawa
Journal of Physics: Conference Series 92 ( 1 ) 2007.12
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Structure of amorphous CeFe2D3.9 observed by X-ray and neutron diffraction Reviewed
Keiji Itoh, Kiyoshi Aoki, Masaaki Sugiyama, Kazuhiro Mori, Toshiharu Fukunaga
JOURNAL OF ALLOYS AND COMPOUNDS 446 19 - 22 2007.10
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Voronoi analysis of the structure of Ni-Zr-Al ternary metallic glass Reviewed
T. Fukunaga, K. Itoh, T. Otomo, K. Mori, A. Sugiyama, H. Kato, A. Hasegawa, A. Hirata, Y. Hirotsu, A. C. Hannon
MATERIALS TRANSACTIONS 48 ( 7 ) 1698 - 1702 2007.7
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Structural analysis of polyelectrolyte film absorbing metal ion by SAXS utilizing with X-ray anomalous dispersion effect Reviewed
Masaaki Sugiyama, Takao Mitsui, Takashi Sato, Yoshinori Akai, Yuji Soejima, Hiroshi Orihara, Yang-Ho Na, Keiji Itoh, Kazuhiro Mori, Toshiharu Fukunaga
JOURNAL OF PHYSICAL CHEMISTRY B 111 ( 29 ) 8663 - 8667 2007.7
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Itoh K, Fukunaga T
JOURNAL OF APPLIED PHYSICS 101 ( 12 ) 2007.6
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Structure of amorphous LaNi5D3.3 studied by neutron and X-ray diffraction Reviewed
K. Itoh, T. Shoumura, K. Mori, M. Sugiyama, T. Fukunaga
JOURNAL OF NON-CRYSTALLINE SOLIDS 353 ( 18-21 ) 1975 - 1978 2007.6
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Local atomic structure analysis of Zr-Ni and Zr-Cu metallic glasses using electron diffraction
Akihiko Hirata, Takuro Morino, Yoshihiko Hirotsu, Keiji Itoh, Toshiharu Fukunaga
MATERIALS TRANSACTIONS 48 ( 6 ) 1299 - 1303 2007.6
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Atomic configuration of metal atoms in (Ti0.676Zr0.324)D-0.31 metallic glass studied by X-ray, neutron diffraction and reverse Monte Carlo modeling Reviewed
K. Itoh, K. Hashi, K. Aoki, K. Mori, M. Sugiyama, T. Fukunaga
JOURNAL OF ALLOYS AND COMPOUNDS 434 180 - 182 2007.5
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Shape of a-crystallin analyzed by small-angle neutron scattering Reviewed
Masaaki Sugiyama, Noriko Fujii, Yukio Morimoto, Toshiya Otomo, Shinichi Takata, Masakatsu Misawa, Masahiko Annaka, Keiji Itoh, Kazuhiro Mori, Takashi Sato, Sakie Kurabayashi, Toshiharu Fukunaga
JOURNAL OF APPLIED CRYSTALLOGRAPHY 40 S200 - S204 2007.4
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Mixed magnetic phase in 6H-type BaFeO3-delta Reviewed
Kazuhiro Mori, Takashi Kamiyama, Hisao Kobayashi, Toshiya Otomo, Kusuo Nishiyama, Masaaki Sugiyama, Keiji Itoh, Toshiharu Fukunaga, Susumu Ikeda
JOURNAL OF APPLIED CRYSTALLOGRAPHY 40 ( SUPPL. 1 ) S501 - S505 2007.4
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Local atomic arrangements and electronic structure of Zr-Ni-Al bulk metallic glass. -Analysis by use of the relevant crystals-
Tsunehiro Takeuchi, Sakura Nakano, Masashi Hasegawa, Kazuo Soda, Hirokazu Sato, Uichiro Mizutani, Keiji Itoh, Toshiharu Fukunaga
Materials Science and Engineering A 448-451 599 - 604 2007.3
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Reverse Monte Carlo modeling of atomic configuration for amorphous materials Reviewed
Toshiharu Fukunaga, Keiji Itoh, Kazuhiro Mori, Masaaki Sugiyama
Solid State Phenomena 127 51 - 56 2007
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Observation of microstructure of hydrated Ca3SiO5 Reviewed
K. Mori, T. Sato, T. Fukunaga, K. Oishi, K. Kimura, K. Iwase, M. Sugiyama, K. Itoh, F. Shikanai, T. Wuernisha, M. Yonemura, D. Sulistyanintyas, I. Tsukushi, S. Takata, T. Otomo, T. Kamiyma, M. Kawai
Physica B: Condensed Matter 385 517 - 519 2006.11
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Charge states of Ca atoms in beta-dicalcium silicate Reviewed
Kazuhiro Mori, Ryoji Kiyanagi, Masao Yonemura, Kenji Iwase, Takashi Sato, Keiji Itoh, Masaaki Sugiyama, Takashi Kamiyama, Toshiharu Fukunaga
JOURNAL OF SOLID STATE CHEMISTRY 179 ( 11 ) 3286 - 3294 2006.11
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Topological characterization of metallic glasses by neutron diffraction and RMC modeling Reviewed
Toshiharu Fukunaga, Keiji Itoh, Toshiya Otomo, Kazuhiro Mori, Masaaki Sugiyama, Hidemi Kato, Masashi Hasegawa, Akihiko Hirata, Yoshihiko Hirotsu, Kiyoshi Aoki
PHYSICA B-CONDENSED MATTER 385 259 - 262 2006.11
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Anisotropic frequency response of critical density fluctuation of NIPA gel under oscillation shear Reviewed
Masaaki Sugiyama, Martin E. Vigild, Toshiharu Fukunaga, Keiji Itoh, Kazuhiro Mori, Takashi Sato, Masahiko Annaka
PHYSICA B-CONDENSED MATTER 385 804 - 806 2006.11
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Structural observation of Li2S-GeS2 superionic glasses Reviewed
Keiji Itoh, Masashi Sonobe, Kazuhiro Mori, Masaaki Sugiyama, Toshiharu Fukunaga
PHYSICA B-CONDENSED MATTER 385 520 - 522 2006.11
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Voronoi analysis of the structure of Cu-Zr and Ni-Zr metallic glasses Reviewed
T. Fukunaga, K. Itoh, T. Otomo, K. Mori, M. Sugiyama, H. Kato, M. Hasegawa, A. Hirata, Y. Hirotsu, A. C. Hannon
INTERMETALLICS 14 ( 8-9 ) 893 - 897 2006.8
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Structural Observation of Amorphous Alloys by Neutron Diffraction
FUKUNAGA Toshiharu, ITOH Keiji
X-RAYS 48 ( 1 ) 70 - 75 2006.2
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Structures and Physical Properties of Metallic Glasses (A02 Research Division)
HIROTSU Yoshihiko
J. Jpn. Soc. Powder Powder Metallurgy 53 ( 1 ) 90 - 99 2006.1
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Investigation of stability of the Zr-Ni-Al bulk amorphous phase from local atomic arrangements of the relevant crystals
Sakura Nakano, Tsunehiro Takeuchi, Kazuo Soda, Masashi Hasegawa, Uichiro Mizutani, Hirokazu Sato, Keiji Itoh, Toshiharu Fukunaga
Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy 53 ( 1 ) 100 - 106 2006.1
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Hydration kinetics of tricalcium silicate studied by neutron scattering Reviewed
Kazuhiro Mori, Yuuya Shiraishi, Takashi Sato, Kenji Iwase, Masaaki Sugiyama, Shinichi Takata, Toshiya Otomo, Keiji Itoh, Masao Yonemura, Fumihito Shikanai, Tuerxun Wuernisha, Dyah Sulistyanintyas, Koji Oishi, Masayoshi Kawai, Takashi Kamiyama, Toshiharu Fukunaga
TRANSACTIONS OF THE MATERIALS RESEARCH SOCIETY OF JAPAN, VOL 31, NO 3 31 ( 3 ) 763 - 766 2006
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Fe-doping effects on lanthanum gallate: La0.8Sr 0.2Ga1-xFexO3 Reviewed
Mori, K., Richardson Jr., J., Maxey, E., Onodera, Y., Kiyanagi, R., Itoh, K., Sugiyama, M., Fukunaga, T.
KURRI Progress Report 212 - 212 2006
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Relation between high ionic conductivity and boson peak in superionic glass Reviewed
M. Arai, H. Iwase, M. Nakamura, T. Otomo, E. Kartini, K. Itoh, S. J. Levett, S. M. Bennington
FLOW DYNAMICS 832 299 - + 2006
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M Nagao, C Pitteloud, T Kamiyama, T Otomo, K Itoh, T Fukunaga, K Tatsumi, R Kanno
JOURNAL OF THE ELECTROCHEMICAL SOCIETY 153 ( 5 ) A914 - A919 2006
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Structure of nano-crystalline FeTiDx by neutron and X-ray diffraction Reviewed
K Itoh, H Sasaki, HT Takeshita, K Mori, T Fukunaga
JOURNAL OF ALLOYS AND COMPOUNDS 404 95 - 98 2005.12
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Free-energy analysis of the Zr-Ni-Al bulk metallic glass from the local atomic arrangements of the relevant crystals
Tsunehiro Takeuchi, Sakura Nakano, Masashi Hasegawa, Kazuo Soda, Hirokazu Sato, Uichiro Mizutani, Keiji Itoh, Toshiharu Fukunaga
Materials Transactions 46 ( 12 ) 2791 - 2798 2005.12
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Local structure of lead halide melts analysed by pulsed neutron diffraction Reviewed
Y Iwadate, Y Seki, K Fukushima, M Misawa, T Fukunaga, K Itoh, T Nakazawa, Y Okamoto, H Matsuura, A Kajinami, N Ohtori, N Umesaki
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS 66 ( 2-4 ) 433 - 438 2005.2
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The design of the neutron total scattering spectrometer for hydrogenous materials at J-PARC-JSNS Reviewed
Kentaro Suzuya, Yasuo Kameda, Toshiya Otomo, Koji Yoshida, Keiji Itoh, Toshiharu Fukunaga, Masakatsu Misawa
Journal of Neutron Research 13 ( 1-3 ) 123 - 128 2005
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Pulsed neutron diffraction of phosphorous acid and its aqueous solution with inactivation capability of activated oxygen Reviewed
Y. Iwadate, Y. Tani, K. Fukushima, M. Misawa, T. Fukunaga, K. Itoh, T. Nakazawa
Journal of Neutron Research 13 ( 1-3 ) 139 - 144 2005
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Structural studies of hydrated tricalcium silicate by neutron powder diffraction
K. Mori, K. Yatsuyanagi, K. Oishi, T. Fukunaga, T. Kamiyama, T. Ishigaki, A. Hoshikawa, S. Harjo, K. Iwase, K. Itoh, M. Kawai
Journal of Neutron Research 13 ( 1-3 ) 163 - 167 2005
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Structural observation and RMC Modeling for Nl-Zr and Cu-Zr metallic glasses Reviewed
T Fukunaga, D Touya, K Itoh, T Otomo, K Mori, H Kato, M Hasegawa
METASTABLE, MECHANICALLY ALLOYED AND NANOCRYSTALLINE MATERIALS 24-25 217 - 220 2005
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M Nagao, C Pitteloud, T Kamiyama, T Otomo, K Itoh, T Fukunaga, R Kanno
JOURNAL OF THE ELECTROCHEMICAL SOCIETY 152 ( 7 ) E230 - E237 2005
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Structural properties of Fe-doped lanthanum gallate
Kazuhiro Mori, Toshiharu Fukunaga, Koji Shibata, Kenji Iwase, Stefanus Harjo, Akinori Hoshikawa, Keiji Itoh, Takashi Kamiyama, Toru Ishigaki
Physica B: Condensed Matter 352 ( 1-4 ) 147 - 155 2004.10
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The structure of binary zinc phosphate glasses Reviewed
K Suzuya, K Itoh, A Kajinami, CK Loong
JOURNAL OF NON-CRYSTALLINE SOLIDS 345 80 - 87 2004.10
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Crystal structure of Fe-doped LaGaO(3-delta) Reviewed
Kazuhiro Mori, Koji Shibata, Hidenori Sagehashi, Toru Ishigaki, Akinori Hoshikawa, Stefanus Harjo, Takashi Kamiyama, Keji Itoh, Toshiharu Fukunaga
PHYSICA B-CONDENSED MATTER 350 ( 1-3 ) E1031 - E1034 2004.7
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FUKUNAGA Toshiharu, ITOH Keiji
Bulletin of the Japan Institute of Metals 43 ( 3 ) 225 - 231 2004.3
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The local structure of hydrogen storage nanocrystalline graphite by neutron scattering Reviewed
Keiji Itoh, Yusuke Miyahara, Shin-Ichi Orimo, Hironobu Fujii, Takashi Kamiyama, Toshiharu Fukunaga
Journal of Alloys and Compounds 356-357 608 - 611 2003.8
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Local structure of BaFeO3-delta studied by neutron scattering Reviewed
K Mori, T Kamiyama, H Kobayashi, K Itoh, T Otomo, S Ikeda
PHYSICA B-CONDENSED MATTER 329 ( II ) 807 - 808 2003.5
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Inelasticity effect on neutron scattering intensities of the Null-H2O Reviewed
Y. Kameda, M. Sasaki, T. Usuki, T. Otomo, K. Itoh, K. Suzuya, T. Fukunaga
Journal of Neutron Research 11 ( 3 ) 153 - 163 2003
MISC
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YU J, 荒井康智, 依田眞一, 小原真司, 高田昌樹, 増野敦信, 黒岩芳弘, 伊藤恵司, 福永俊晴, 野澤俊介, 腰原伸也
日本セラミックス協会年会講演予稿集 2009 69 2009.3
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30aRE-7 Construction of high-intensity total diffractometer (NOVA) at J-PARC
Otomo T., Misawa M., Suzuya K., Kaneko N., Ohshita H., Fukunaga T., Itoh K., Mori K., Sugiyama M., Kameda Y., Yamaguchi T., Yoshita K., Kawakita Y., Maruyama K., Shamoto S., Takata S., Satoh S., Muto S., Suzuki J., Yasu Y., Nakayoshi K., Uno S., Tanakta M.
Meeting abstracts of the Physical Society of Japan 64 ( 1 ) 973 - 973 2009.3
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30pYK-5 Structures of glassy and metastable crystalline BaTi_2O_5
Yu J., Koshihara S., Arai Y., Kohara S., Takata M., Masuno A., Kuroiwa Y., Itoh K., Fukunaga T., Nozawa S.
Meeting Abstracts of the Physical Society of Japan 64 ( 0 ) 804 - 804 2009
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26aTH-11 Phonon dynamics in metallic glass CuZr_2 -3
Nakashima S., Kawakita Y., Otomo T., Suenaga R., BARON Alfred.Q.R., Tsutsui S., Takeda S., Itoh K., Kato H., Fukunaga T., Hasegawa M.
Meeting abstracts of the Physical Society of Japan 63 ( 1 ) 783 - 783 2008.2
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22aTR-8 Structural observation of Li_2S-P_2S_5 superionic conductors
Onodera Yohei, Itoh Keiji, Mori Kazuhiro, Sugiyama Masaaki, Otomo Toshiya, Fukunaga Toshiharu
Meeting abstracts of the Physical Society of Japan 62 ( 2 ) 747 - 747 2007.8
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Investigation of Stability of the Zr-Ni-Al Bulk Amorphous Phase from Local Atomic Arrangements of the Relevant Crystals
中野さくら, 竹内恒博, 曽田一雄, 長谷川正, 水谷宇一郎, 佐藤洋一, 伊藤恵司, 福永俊晴
粉体および粉末冶金 53 ( 1 ) 2006
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24pYK-2 Dielectric characteristic of BaTi_2O_5 glass II : Structure analysis
Yu Jianding, Sato Tokushi, Arai Yasutomo, Masuno Atsunobu, Kohara Shinji, Itoh Keiji, Kuroiwa Yoshihiro, Taniguchi Hiroki, Itoh Mitsuru, Nozawa Shunsuke
Meeting Abstracts of the Physical Society of Japan 61 ( 0 ) 793 - 793 2006
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Y Iwadate, M Suzuki, T Hattori, K Fukushima, S Nishiyama, M Misawa, T Fukunaga, K Itoh
JOURNAL OF ALLOYS AND COMPOUNDS 389 ( 1-2 ) 229 - 233 2005.3
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Atomic structure of hydrogen storage amorphous alloys
T. Fukunaga, K. Itoh, K. Aoki
Materials Science Forum 502 257 - 262 2005
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28pWE-10 Low-energy Excitation of Super ionic Glass AgI-Ag_2S-AgPO_3
Iwase H., Arai M., Otomo T., Kartini E., Itoh K., Levett S., Bennington S. M.
Meeting abstracts of the Physical Society of Japan 59 ( 1 ) 368 - 368 2004.3
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X-Ray and neutron diffraction studies of atomic scale structures of crystalline and amorphous TbFe2Dx
Keiji Itoh, Kazuyuki Kanda, Kiyoshi Aoki, Toshiharu Fukunaga
Journal of Alloys and Compounds 348 ( 1-2 ) 167 - 172 2003.1
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Structure of amorphous P-Se prepared by mechanical alloying
K. Itoh, M. Misawa, T. Fukunaga
Journal of Non-Crystalline Solids 312-314 561 - 565 2002.10
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Short range structures of amorphous Se-Te prepared by mechanical alloying
K Itoh, M Misawa, T Fukunaga
JOURNAL OF NON-CRYSTALLINE SOLIDS 293 575 - 579 2001.11
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Neutron diffraction of amorphous Se-Te prepared by MA
K. Itoh, M. Misawa, T. Fukunaga
Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy 48 ( 9 ) 806 - 809 2001
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メカニカルアロイングにより作製されたアモルファスSe-Teの構造(共著)
ITOH K, MISAWA M, FUKUNAGA T
Journal of Non-Crystalline Solids 293/295 575 - 579 2001
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Short range structures of amorphous Se-Te alloy
Itoh K., Misawa M., Fukunaga T.
Meeting abstracts of the Physical Society of Japan 55 ( 2 ) 684 - 684 2000.9
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Neutron diffraction of liquid Sn-Se system
K Itoh, K Maruyama, M Misawa, S Tamaki
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 69 ( 6 ) 1717 - 1722 2000.6
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30p-G-5 Neutron Diffruction of Liquid Sn-Se System
Itoh K., Maruyama K., Misawa M., Tamaki S.
Meeting abstracts of the Physical Society of Japan 54 ( 1 ) 515 - 515 1999.3
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Ionic and Electronic Conductions in Liquid Metal-Charcogen System.
Journal of Non-Crystalline Solids 250/252 ( Pt.1 ) 336 - 339 1999
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Magnetic susceptibility in liquid In-Se system
K Itoh, T Usuki, S Tamaki
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 67 ( 9 ) 3240 - 3243 1998.9
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(6)Electronic and Ionic Conductions in Liquid Cu-Se system(共著)
Keiji Itoh, Takeshi Usuki, Shigeru Tamaki
Journal of the Physical Society of Japan 67 ( 10 ) 3512 - 3516 1998
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液体In-Se系の磁化率
Journal of the Physical Society of Japan 67 ( 9 ) 3240 - 3243 1998
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Ionic Conduction and Electronic Properties in Liquid In–Se System
Itoh Keiji, Usuki Takesi, Tamaki Shigeru
J Phys Soc Jpn 67 ( 7 ) 2415 - 2420 1998
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(4)Ionic conduction and electronic properties in liquid In-Se system(共著)
Keiji Itoh, Takesi Usuki, Shigeru Tamaki
Journal of the Physical Society of Japan 67 ( 7 ) 2415 - 2420 1998
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28p-X-1 Short-range order of liquid As-chalcogen alloys
Usuki T., Ito K., Uemura O., Kameda Y.
Meeting abstracts of the Physical Society of Japan 52 ( 1 ) 531 - 531 1997.3
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Electronic and structural properties of molten (In_<1/2>Pb_<1/2>)-Te system
Ito K., Usuki T., Uemura O., Kameda Y.
Abstracts of the meeting of the Physical Society of Japan. Sectional meeting 1995 ( 3 ) 288 - 288 1995.9
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NEUTRON-DIFFRACTION STUDY OF LIQUID (TL1/2PB1/2)-X (X-TE,SE) SYSTEMS
T USUKI, O UEMURA, K ITOH, Y KAMEDA
PHYSICA B 213 555 - 557 1995.8
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ELECTRONIC AND STRUCTURAL-PROPERTIES OF THE LIQUID (TL1/2PB1/2)-SE SYSTEM
T USUKI, K ITOH, S AITA, Y KAMEDA, O UEMURA
PHYSICA STATUS SOLIDI B-BASIC RESEARCH 187 ( 1 ) 157 - 168 1995.1
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液体(Tl1/2Pb1/2)-Se系の電子的性質と構造
USUKI T, ITOH K, AITA S, KAMEDA Y, UEMURA O
European Conference on Physics of Magnetism 2002 187 ( 1 ) 157 - 168 1995
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3p-YC-1 Electronic and structural properties of liquid (Tl_<1/2>Pb_<1/2>)-Se System
Usuki T, Uemura O, Ito K, Kameda Y
Abstracts of the meeting of the Physical Society of Japan. Sectional meeting 1994 ( 3 ) 196 - 196 1994.8
Research Projects
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金属―水素系の局所構造解析：結晶中に無秩序分布する局所格子膨張の直接観察
Grant number：21K04907 2021.04 - 2024.03
日本学術振興会 科学研究費助成事業 基盤研究(C)
伊藤 恵司
Grant amount：\4160000 （ Direct expense: \3200000 、 Indirect expense：\960000 ）
本研究の目的は，α-VDx結晶(x = 0.7～0.8)における（重）水素原子周囲の局所格子膨張を２体分布関数解析法により直接観察することである。２体分布関数は平均かつ１次元情報であるため，試料のクオリティーが重要となる。すなわち，単相試料であることが必須であり，第２相の混入は致命的となる。そこで，まずは高純度の水素化試料の合成を試みた。そのために，水素化装置を作製するとともに，ホスト金属試料として最適な高純度バナジウム粉末試料を選定した。高温真空下でバナジウム粉末の活性化処理を行い，高重度重水素ガス（99.999%）と直接反応させて水素化を行った。水素吸蔵前後の圧力変化から吸蔵水素量を求めた。X線回折実験（Cuターゲット使用）により結晶相の確認をおこなった。活性化処理条件や水素化温度等の試行錯誤の結果，３種類の試料の作製に成功した。これらの試料について，中性子回折実験を行った。中性子回折実験は，J-PARC物質・生命科学実験施設内中性子BL21に設置されている中性子全散乱装置を用いて行われた。得られた散乱強度のデータについて吸収や多重散乱等の補正及び規格化を行うことにより構造因子を得た．実空間の情報である２体分布関数は，構造因子をフーリエ変換することにより得た。得られた２体分布関数の0.17 nm付近にバナジウムと重水素の相関ピークが観察された。このバナジウム―重水素の距離情報は本研究の目的達成に不可欠な情報である。
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Deformation and in-situ structural transition of metallic glasses with inhomogeneous local structure under the various applied loads
Grant number：23246109 2011.04 - 2015.03
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)
SAIDA Junji, IMAFUKU Muneyuki, SUZUKI Hiroshi, SATO Shigeo, ITOH Keiji, SHOBU Takahisa
Grant amount：\49010000 （ Direct expense: \37700000 、 Indirect expense：\11310000 ）
Deformation and in-situ structural transition in Zr-based metallic glasses have been analyzed using high-energy x-ray diffraction by the evaluation of macroscopic, microscopic (medium-range) and atomic (short-range) strains. We found that change in microscopic strain strongly depends on the difference of inhomogeneous local structure, which is enhanced in the metallic glass with multi-components. Meanwhile, atomic strain is affected by the kind of pairs among the constitutional elements. Thus, it is important to investigate the deformation mechanism in metallic glasses using multi-scale analysis due to the different behavior with scale length.
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Refractive index calculation of high refractive index oxide glasses
Grant number：23560814 2011 - 2013
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
AARAI Yasutomo, MARUYAMA Kenji, ITOH Keiji
Grant amount：\5070000 （ Direct expense: \3900000 、 Indirect expense：\1170000 ）
High refractive index glasses are key parts for an optical applications, for example digital camera. The refractive index of Ln4Ti9O24 glasses (Ln=La, Nd and Sm) are similar with the indices of Nb2O5 and Ta2O5 thin film (n 2.3). The value is the maximum refractive index of transparent commercial glass materials. The report presents the refractive index calculation of the Ln2O3-TiO2 glasses without using the atomic structure modeling. The isotope enriched neutron diffraction experiments of SmTi2.25O6 glasses has executed. The partial pair distribution function and 3-dimensional atomic configuration of LaTi2.25O6 glass calculated by using Reverse Montel Carlo method reproduce the measured refractive index within +-0.16.
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Free volume and medium range structure analyses of amorphous alloys
Grant number：23560836 2011 - 2013
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
ITOH Keiji
Grant amount：\5460000 （ Direct expense: \4200000 、 Indirect expense：\1260000 ）
In this work, neutron diffraction and reverse Monte Carlo (RMC) simulation were performed on Ni-Zr amorphous alloys and its deuteride. Obtained structural models were analyzed in detail. These atomic configurations were divided into fundamental structural units, in order to investigate how the short and medium range structures are formed by a connection of these units. Moreover, the possibility of the quantitative analysis of free volume was examined.
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Fabrication of hydrogen absorption nano-sized non-equilibrium material and observation of the static and dynamic structure by neutron scattering
Grant number：20360316 2008 - 2010
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
FUKUNAGA Toshiharu, ITOH Keiji, MORI Kazuhiro
Grant amount：\19890000 （ Direct expense: \15300000 、 Indirect expense：\4590000 ）
The occupation of hydrogen atoms in the nano-graphite, the LaNi_5Dx amorphous alloys, and the Mg_<50>Ni_<50> amorphous alloy, which were synthesized by milling under hydrogen atmosphere, was clarified by a combination of neutron diffraction and Reverse Monte Carlo (RMC) simulation. Then, topological characteristics of Zr_<0.39>Ni_<0.61> and (Zr_<0.39>Ni_<0.61>)D_<0.59> amorphous alloys were investigated by using Voronoi analysis of the RMC model. The SANS curve for the deuterated Mg_2Ni showed the homogeneous distribution of hydrogen atoms. The behavior of hydrogen molecules adsorbed onto the nanospace of porous materials is of great interest and then a direct visualization of deuterium molecules adsorbed on isoreticular metal organic frameworks (IRMOF-1) was carried out by using reverse Monte Carlo simulation based on first principle molecular dynamics simulation and neutron diffraction. During the research period, we have constructed new total scattering spectrometer (NOVA) at the spallation neutron source in MLF facility of J-PARC.
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Refractive index calculation from glass structures of high refractive index glasses
Grant number：20560635 2008 - 2010
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
ARAI Yasutomo, ITOH Keiji, MARUYAMA Kenji
Grant amount：\4680000 （ Direct expense: \3600000 、 Indirect expense：\1080000 ）
Refractive index calculation from glass structures of high refractive index of Titanate and Niobate glass. The glass structures has been measured by neutron, synchrotron X-ray diffraction and EXAFS experiments. We use the Lines theory for calculating the glass refractive index. The maximum discrepancy between the calculated glass refractive indices and measured indices is 2% for Samarium titanate glass.
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Local structure of crystalline and non-crystalline metal-hydrides
Grant number：20760470 2008 - 2009
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)
ITOH Keiji
Grant amount：\4290000 （ Direct expense: \3300000 、 Indirect expense：\990000 ）
Neutron and X-ray diffraction and reverse Monte Carlo (RMC) simulation were performed on Ni-Zr amorphous alloys to investigate the rearrangement of metal atoms due to the deuterium absorption. The results showed that the Zr-Zr distances slightly increase but the Zr-Ni and Ni-Ni distances remain virtually unchanged after the deuterium absorption. Additionally, the Voronoi polyhedral analysis of the RMC configurations showed that there is not much difference in the local structure around Zr and Ni before and after the deuterium absorption.
Moreover, neutron diffraction results showed that V-D distance in α-VDx is independent with x. -
中性子およびX線回折による水素吸蔵結晶合金の局所構造観察の研究
Grant number：18760494 2006 - 2007
日本学術振興会 科学研究費助成事業 若手研究(B)
伊藤 恵司
Grant amount：\3400000 （ Direct expense: \3400000 ）
【研究内容】本研究では,従来のブラッグピークに基づく結晶構造解析法ではなく、液体やアモルファスなどの非晶質材料の構造解析手法である"二体分布関数解析法"をバナジウム水素化物(β-V2H)の構造解析に適用し、V格子構造の詳細解明を試みた。すなわち、放射光X線回折実験により得られたβ-V2H粉末試料の回折データについて、バックグラウンドや試料吸収などの補正を行い、1原子あたりの散乱強度に規格化された構造因子を得た。さらに、構造因子をフーリエ変換することにより二体分布関数を得た。バナジウム水素化物(β-V2H)の二体分布関数から,V-V原子間距離を直接観察することで,水素吸蔵によるバナジウム格子構造の変化についての重要な情報を得ることに成功した。すなわち、バナジウム原子が理想的な格子位置から0.01nm変位して、水素原子と安定な距離を維持していることが明らかになった。
【研究の意義および重要性】水素吸蔵合金の高容量化が求められている中、バナジウム系合金は水素吸蔵合金の中で最も高い理論水素吸蔵容量をもつことで注目されている。バナジウム系合金の更なる高容量化や水素吸放出特性の改善のためには、バナジウム水素化物についての基礎的研究で得られる情報が不可欠である。特に,水素化にともなうホストバナジウム格子構造の詳細解明、すなわち、理想的な格子位置からのV原子の"変位"の定量は,V-H間の相互作用を直接反映し,この値を正確に見積もることはバナジウム水素化物の安定性を考える上でとりわけ重要である。 -
中性子散乱による融体・金属ガラスの構造ゆらぎとダイナミックス
Grant number：15074208 2003 - 2007
日本学術振興会 科学研究費助成事業 特定領域研究
福永 俊晴, 伊藤 恵司, 大友 季哉
Grant amount：\45300000 （ Direct expense: \45300000 ）
金属ガラスの安定性は金属ガラスを構成する短範囲構造ユニットや中距離構造と深い関係があると考える。さらに、非平衡状態では安定になるための原子の動きがあることから、原子の運動とも深く関わっていると考えられる。熱的に安定なCu-Zr金属ガラスは20面体的な構造ユニットが多く存在するが、Ni-Zr金属ガラスはNi-Zr系の安定結晶を構成している三角プリズム構造が多く存在することが明らかになった。そのNi-Zr系金属ガラスにA1などの第三元素を添加することにより熱的安定性が増すが、そのときの構造変化を調べた結果、A1添加により三角プリズム構造が減少し、20面体的な構造ユニットの増加が観察された。このことは金属ガラスの熱的安定性は構造学的に20面体的な構造ユニットが強く関わっていることを示唆している。Cu-Zr系金属ガラスに第三元素としてA1を添加したときの構造変化を調べると、20面体的な構造ユニットの構造の急激な増加は見られないが、正20面体的なユニットの増加が観察された。この変化を、中性子非弾性散乱を用いたダイナミックス観点から検討を行った結果、5meV付近に観察される低エネルギー励起(ボゾンピーク)の強度がA1を添加することによって低下することが明らかになった。この現象は金属ガラスにおける自由体積(free volume)の減少と解釈することが出来ることから、第三元素の添加による金属ガラスの熱的安定性は系の自由体積の減少による原子の動きの低下によるものと解釈することができる。すなわち、金属ガラスの熱的安定性をよくするためには、系の構成構造ユニットである正20面体を増加させ、かつ自由体積を減少させることであることが明らかになった。
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中性子回折によるナノ水素吸蔵合金の構造の解明
Grant number：15710087 2003 - 2004
日本学術振興会 科学研究費助成事業 若手研究(B)
伊藤 恵司
Grant amount：\3600000 （ Direct expense: \3600000 ）
近年、ナノ構造化による特異な水素吸蔵特性が見出されている。本研究では、バナジウム-水素系とグラファイト-水素系の2つの系について、水素原子の存在位置及びその周囲の環境をパルス中性子および高エネルギーX線回折実験により明らかにすることを目的とした。ナノβ-VD_<0.5>とナノグラファイト-水素は、重水素ガス雰囲気下におけるメカニカルミリングにより作製された。これらのサンプルは微粉末のため酸化しやすく吸湿性が高い。したがって、不活性ガス置換したグローブボックス内でサンプルの取り扱いをおこなった。X線回折実験ではカプトンウインドウの密閉セルを用い、中性子回折実験ではTiZr合金の密閉セルを用いた。
ナノβ-VD_<0.5>については、高エネルギーX線回折実験の結果から、V金属格子がこれまで報告されているBCT構造とは異なることが明らかになった。さらに、パルス中性子回折実験とリバースモンテカルロ計算から、水素原子は8面体の中心から4方向にずれた位置で存在確率が高いことが明らかになった。
一方、ナノグラファイト水素系については、中性子回折実験により得られた動径分布関数において,通常のグラファイトにおけるC-C結合のほかに、C-C単結合に相当する相関ピークが観測された。更に、中性子非弾性散乱スペクトルにおいてsp^3炭素のC-H変角振動に対応するピークが観測されたことから、sp^2混成炭素の他にsp^3混成炭素が存在していることが明らかになった。 -
中性子回折によるTi-Zr系水素吸蔵合金の水素原子位置の解明
Grant number：13750611 2001 - 2002
日本学術振興会 科学研究費助成事業 若手研究(B)
伊藤 恵司
Grant amount：\2300000 （ Direct expense: \2300000 ）
本研究では、中性子零散乱合金であるTi_<0.6756>Zr_<0.3244>組成粉末を重水素雰囲気中でミリングすることにより、アモルファス及び結晶(Ti_<0.6756>Zr_<0.3244>)D_xを作製し、それらの原子構造ならびに水素原子の存在位置を中性子回折実験により調べた。
Ti(99.99%,#100)及びZr(98%,#100)を高純度Ar(5N)で数回置換し、1.3×10^<-2>Pa以下まで真空引きした後、遊星型ボールミル(フリッチュP-5)により0.08MPa及び2MPaの重水素雰囲気中で720ksミリングし、アモルファス(Ti_<0.6756>Zr_<0.3244>)D_<0.31>及び結晶(Ti_<0.6756>Zr_<0.3244>)D_<1.54>をそれぞれ作製した。中性子回折実験は高エネルギー加速器研究機構・物質構造科学研究所に設置されているHIT-II回折装置を用いて行われた。
Zr原子の中性子に対する干渉性核散乱振幅は正の値であるのに対し、Ti原子のそれは負の値であるので、中性子回折で得られたRDF(r)のTi-Zr相関は負のピークとして観測される。アモルファスTi_<0.6756>Zr_<0.3244>D_<0.31>のRDF(r)にはTi-Zr相関に相当する負のピークが観測された。これはミリングによりTiとZrが原子レベルで混合していることを示している。また、S(Q)のピーク位置から、アモルファス相ではTi-Zr系の高温相であるBCC構造が残っていることがわかった。一方、結晶Ti_<0.6756>Zr_<0.3244>D_<1.54>のRDF(r)には、Ti-Zr相関に相当する負のピークは観測されなかった。また、S(Q)のピーク位置がTi及びZrの水素化物のそれと一致することから、ミリングによりTiとZrの原子レベルの混合がおこなわれず、それぞれの水素化物が形成されたものと考えられる。
更に、アモルファス(Ti_<0.6756>Zr_<0.3244>)D_<0.31>における水素原子の存在サイトに関する詳細な情報を得るため、中性子回折実験により得られたデータについてリバースモンテカルロ計算を行った。その結果、98%の水素原子が4面体サイトに存在していることが明らかになった。 -
超軽量水素吸蔵材料の開発
Grant number：12875118 2000 - 2001
日本学術振興会 科学研究費助成事業 萌芽的研究
福永 俊晴, 伊藤 恵司
Grant amount：\2200000 （ Direct expense: \2200000 ）
(A)軽量水素吸蔵材料としてグラファイトのポーラス化を試みている。
1.ナノポーラスカーボン(カーボンエアロゲル)の水素化
アルコールの超臨界状態を用いてゲル状のカーボンを作製し、さらにそのゲル状カーボンを乾燥させてナノポーラスカーボンを作製し、それを圧力セル中に入れベーキングした後水素を6Mpaまで導入し水素化を試みた。現在、種々の実験を試みている。
2.カーボンマイクロコイル
微量の硫黄を含むアセチレンをNiなどの触媒中で750-800℃で0,5-2時間熱分解させることにより得られる。As-grownのカーボンコイルはほとんどがアモルファスであるが、2500-3000℃で熱処理をするとコイル状を保持したままグラファイト化する。
この状態の構造変化を中性子回折で観察し、どの状態が水素を吸蔵しやすいかを確認している。
このような多種多様な方法でナノポーラスカーボンやポーラスカーボン、そしてカーボンマイクロコイル、さらにカーボンナノファィバーなどを作製し、水素吸蔵特性をチェックしながら、そのカーボン材料の構造を高分解能中性子回折によって観察し、水素の存在位置を明らかにしようとしている。
(B)TiやMg金属を含む水素吸蔵材料
グラファイトにTiやMg金属を混入させ、軽量でかっ、水素を多量に吸蔵させることができる材料の探索と、中性子回折による構造観察、ならびに水素原子の存在位置の観察を行っている。水素原子はグラファイトのダングリングボンドと選択的に結合していることが明らかとなった。
(C)Ti-Zr系に水素を吸蔵させて、水素原子の存在位置を中性子回折で明らかにしている。水素原子を吸蔵するとアモルファス化することから、水素原子の存在は単にTiやZrの水素化物を形成するだけではないことが明らかとなった。 -
Development and structural investigation for nano-graphite energy storage materials
Grant number：12450259 2000 - 2001
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
FUKUNAGA Toshiharu, ITOH Keiji, KAWAGUCHI Akio
Grant amount：\15100000 （ Direct expense: \15100000 ）
Nano-structured graphite was prepared by mechanical milling under hydrogen gas atmosphere. The sample during the milling process was studied by X-ray diffraction. The long-range ordering of the interlayer disappears continuously with increasing milling time. The hydrogen concentration reached up to 7.4 mass% after milling 80 hours. In order to get more information of the detailed atomic arrangement and the location of hydrogen atoms in the graphite, the structure factors S(Q) of the samples were measured up to Q=50 A^<-1> by neutron diffraction. The conformation in the graphite was changed by the creation of dangling bonds and the new peaks due to the hydrogen (deuterium) atoms in the graphite were apparently observed in RDF(r), which was derived from the Fourier transformation of S(Q). Two types of the deuterium coordinations were found in radial distribution function RDF(r). One is the C-D covalent bond and the other is deuterium located between layers of the graphite.
The next work was carried out to clarify the thermal desorption property for the sample mechanically milled for 80 h under hydrogen atmosphere Two desorption peaks of hydrogen molecule, starting at about 600 and 950 K, respectively, were observed in thermal desorption mass spectroscopy. This result indicates that the nano-structured graphite is expected to retain two types of structures with suitabl e trapping sites for hydrogen storage.
Therefore, the results lead us to believe that nano-structured graphite prepared by mechanical milling constitutes one of the most effective media for the absorption and retention of large quantities of hydrogen. -
中性子散乱によるプロチウム吸蔵合金の構造研究
Grant number：12022216 2000
日本学術振興会 科学研究費助成事業 特定領域研究(A)
福永 俊晴, 伊藤 恵司
Grant amount：\2100000 （ Direct expense: \2100000 ）
メカニカルアロイング(MA)法を用いてTi-Zr系ならびにTb-Fe系の結晶並びにアモルファス材料の水素吸蔵合金を作製した。
1.Ti-Zr系水素吸蔵合金
TiとZrの状態図は全率固溶体であり、このような系ではTiとZr原子の組成分布はランダムに配列する。それ故にTiとZrの中性子に対する干渉性散乱振幅が負と正であることを利用すれば、Ti-32.4at%Zr組成で中性子零散乱合金となる。中性子零散乱合金での中性子回折から得られた強度からBhatia-Thomtonの定義に基づいて得られた構造因子ならびに分布関数は濃度-濃度相関を表している。この場合、系全体が完全固溶体であるので、得られた濃度-濃度相関分布関数はTi-Zr相関を示す小さな負のピークを示す以外非常に揺らぎの少ないものであることが明らかにされた。さらに、Ti-32.4at%Zr中性子零散乱合金組成の粉末を水素雰囲気(中性子散乱のために重水素を使用)中でメカニカルアロイングを行い(Ti-32.4at%Zr)D_<0.12>アモルファス合金を作製した。Ti-32.4at%Zr中性子零散乱合金は水素を吸蔵することにより、その組成揺らぎが助長されることが明らかとなった。特に水素原子との親和力の違いによりD原子の周りのTiとZr原子の位置が変化していくものと考えられる。
2.Tb-Fe系の水素吸蔵合金
この系ではTbならびにFe粉末を1:2の割合で混合し、重水素雰囲気中でメカニカルアロイングを行った。この系では結晶性水素吸蔵合金とアモルファス水素吸蔵合金がそのミリング条件の違いにより結晶性が保持されたり、アモルファス化が促進されたりすることが明らかになった。それぞれ、水素原子の存在位置が異なっていることも明らかとなった。アモルファス化においては水素原子と親和力の大きいTb原子で構成する4面体に水素が入ることにより、結晶構造がゆがみ、アモルファス化が促進されることが明らかとなった。 -
Neutron Diffraction of Non-Crystalline System.
Grant type：Competitive
-
水素吸蔵合金の中性子回析
Grant type：Competitive
-
非晶質系の中性子回析
Grant type：Competitive
-
Neutron Diffraction of Hydrogen Absorbing Alloys
Grant type：Competitive
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Electricity and Magnetism (1) （2022academic year） 1st semester - 木5,木6
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Electricity and Magnetism (2) （2022academic year） Second semester - 木5,木6
-
Special Studies in Educational Science(Special Studies in Project Based Learning （2022academic year） Second semester - その他
-
Special Studies in Educational Science(Special Studies in Project Based Learning （2022academic year） Third semester - その他
-
Special Studies in Educational Science(Special Studies in Project Based Learning （2022academic year） Fourth semester - その他
-
Special Studies in Educational Science(Special Studies in Project Based Learning （2022academic year） 1st semester - その他
-
Special Studies in Educational Science(Special Studies in Project Based Learning （2022academic year） Second semester - その他
-
Special Studies in Educational Science(Special Studies in Project Based Learning （2022academic year） Third semester - その他
-
Special Studies in Educational Science(Special Studies in Project Based Learning （2022academic year） Fourth semester - その他
-
Secondary Education Science Content Construction Ⅰ （2021academic year） 1st semester - 火3,火4
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Secondary Education Science Content Construction Ⅲ （2021academic year） 3rd and 4th semester - その他
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Physics Laboratory A （2021academic year） 3rd and 4th semester - 金1～4
-
Physics Laboratory B （2021academic year） 3rd and 4th semester - 金1～4
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Introduction to Physics A （2021academic year） Third semester - 木7,木8
-
Introduction to Physics B （2021academic year） Fourth semester - 木7,木8
-
Fundamental Physics Laboratory （2021academic year） 1st-4th semester - その他
-
Studies in physics Contents for Secondary Science Education A （2021academic year） 1st semester - 月1,月2
-
Studies in physics Contents for Secondary Science Education B （2021academic year） Second semester - 月1,月2
-
Modern Physics Ⅰ （2021academic year） 1st semester - 月3～4
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Modern Physics Ⅱ （2021academic year） Second semester - 月3～4
-
Studies in physics Contents for Secondary Science Education A （2021academic year） 3rd and 4th semester - その他
-
Studies in physics Contents for Secondary Science Education B （2021academic year） 3rd and 4th semester - その他
-
Primary Education Science Content Construction （2021academic year） 3rd and 4th semester - その他
-
Content Studies in Science for Elementary Education A （2021academic year） 1st semester - 金7,金8
-
Content Studies in Science for Elementary Education B （2021academic year） Second semester - 金7,金8
-
Primary Education Science Content Teaching （2021academic year） 1st semester - 金7,金8
-
Introduction of Project Based Learning （2021academic year） 1st semester - 火1,火2
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Special Studies in Educational Science(Physics IIIA): Seminar （2021academic year） 1st-4th semester - その他
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Special Studies in Educational Science(Physics IIIB): Seminar （2021academic year） 1st-4th semester - その他
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Special Studies in Educational Science(Physics IVA) （2021academic year） Third semester - その他
-
Special Studies in Educational Science(Physics IVB) （2021academic year） Fourth semester - その他
-
Project Research in Educational Science （2021academic year） 1st-4th semester - その他
-
Physics for General Education (Electromagnetism) 1 （2021academic year） Third semester - 木5～6
-
Physics for General Education (Electromagnetism) 2 （2021academic year） Fourth semester - 木5～6
-
Materials Science Ⅰ （2021academic year） special - その他
-
Materials Science Ⅱ （2021academic year） special - その他
-
Physics Laboratory (1) （2021academic year） 3rd and 4th semester - その他
-
Physics Laboratory (2) （2021academic year） 3rd and 4th semester - その他
-
Basic Physics A （2021academic year） Third semester - 木7,木8
-
Basic Physics B （2021academic year） Fourth semester - 木7,木8
-
Fundamental Physics Laboratory （2021academic year） special - その他
-
Modern Physics (1) （2021academic year） 1st semester - 月3～4
-
Modern Physics (2) （2021academic year） Second semester - 月3～4
-
Physics in basic sciences （2021academic year） 1st semester - 木7,木8
-
Basic Science (Physics) （2021academic year） 1st semester - 木7,木8
-
Project Based Learning I （2021academic year） Second semester - 火1,火2
-
Project Based Learning II （2021academic year） Third semester - 火1,火2
-
Project Based Learning III （2021academic year） Fourth semester - 火1,火2
-
Special Studies in Educational Science(Special Studies in Project Based Learning （2021academic year） Second semester - その他
-
Special Studies in Educational Science(Special Studies in Project Based Learning （2021academic year） Third semester - その他
-
Special Studies in Educational Science(Special Studies in Project Based Learning （2021academic year） Fourth semester - その他
-
Special Studies in Educational Science(Special Studies in Project Based Learning （2021academic year） 1st semester - その他
-
Special Studies in Educational Science(Special Studies in Project Based Learning （2021academic year） Second semester - その他
-
Special Studies in Educational Science(Special Studies in Project Based Learning （2021academic year） Third semester - その他
-
Special Studies in Educational Science(Special Studies in Project Based Learning （2021academic year） Fourth semester - その他
-
Secondary Education Science Content Construction Ⅰ （2020academic year） 1st semester - 火3,火4
-
Physics Laboratory A （2020academic year） 3rd and 4th semester - その他
-
Physics Laboratory B （2020academic year） 3rd and 4th semester - その他
-
Introduction to Physics A （2020academic year） Third semester - 木7,木8
-
Introduction to Physics B （2020academic year） Fourth semester - 木7,木8
-
Studies in physics Contents for Secondary Science Education A （2020academic year） 1st semester - 月1,月2
-
Studies in physics Contents for Secondary Science Education B （2020academic year） Second semester - 月1,月2
-
Electricity and Magnetism I （2020academic year） 1st semester - 木5,木6
-
Electricity and Magnetism Ⅱ （2020academic year） Second semester - 木5,木6
-
Studies in physics Contents for Secondary Science Education A （2020academic year） 3rd and 4th semester - その他
-
Studies in physics Contents for Secondary Science Education B （2020academic year） 3rd and 4th semester - その他
-
Content Studies in Science for Elementary Education A （2020academic year） 1st semester - 金7,金8
-
Content Studies in Science for Elementary Education B （2020academic year） Second semester - 金7,金8
-
Primary Education Science Content Teaching （2020academic year） 1st semester - 金7,金8
-
Approaches to Education （2020academic year） 1st semester - 火1,火2
-
Special Studies in Idea and Problems of Academic Training B （2020academic year） 1st semester - 金1,金2
-
Introduction of Project Based Learning （2020academic year） 1st semester - 火1,火2
-
Special Studies in Educational Science(Physics IIIA) （2020academic year） Third semester - その他
-
Special Studies in Educational Science(Physics IIIB) （2020academic year） Fourth semester - その他
-
Project Research in Educational Science （2020academic year） 1st-4th semester - その他
-
Physics for General Education (Electromagnetism) 1 （2020academic year） Third semester - 木5,木6
-
Physics for General Education (Electromagnetism) 2 （2020academic year） Fourth semester - 木5,木6
-
Materials Science Ⅰ （2020academic year） 1st semester - その他
-
Materials Science Ⅱ （2020academic year） Second semester - その他
-
Physics Laboratory (1) （2020academic year） 3rd and 4th semester - その他
-
Physics Laboratory (2) （2020academic year） 3rd and 4th semester - その他
-
Basic Physics （2020academic year） Other - [第３学期], [第４学期]
-
Basic Physics A （2020academic year） Third semester - 木7,木8
-
Basic Physics B （2020academic year） Fourth semester - 木7,木8
-
Fundamental Physics Laboratory （2020academic year） special - その他
-
Physics in basic sciences （2020academic year） 1st semester - 木7,木8
-
Basic Science (Physics) （2020academic year） 1st semester - 木7,木8
-
Electricity and Magnetism (1) （2020academic year） 1st semester - 木5,木6
-
Electricity and Magnetism (2) （2020academic year） Second semester - 木5,木6
-
Project Based Learning I （2020academic year） Second semester - 火1,火2
-
Project Based Learning II （2020academic year） Third semester - 火1,火2
-
Project Based Learning III （2020academic year） Fourth semester - 火1,火2
-
Special Studies in Educational Science(Special Studies in Project Based Learning （2020academic year） 1st semester - 金5,金6
-
Special Studies in Educational Science(Special Studies in Project Based Learning （2020academic year） Second semester - その他
-
Special Studies in Educational Science(Special Studies in Project Based Learning （2020academic year） Third semester - その他
-
Special Studies in Educational Science(Special Studies in Project Based Learning （2020academic year） Fourth semester - その他
-
Special Studies in Educational Science(Special Studies in Project Based Learning （2020academic year） 1st semester - その他
-
Special Studies in Educational Science(Special Studies in Project Based Learning （2020academic year） Second semester - その他
-
Special Studies in Educational Science(Special Studies in Project Based Learning （2020academic year） Third semester - その他
-
Special Studies in Educational Science(Special Studies in Project Based Learning （2020academic year） Fourth semester - その他