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Yamashita, Keishiro*; Komatsu, Kazuki*; Klotz, S.*; Fabelo, O.*; Fern
ndez-D
az, M. T.*; Abe, Jun*; Machida, Shinichi*; Hattori, Takanori; Irifune, Tetsuo*; Shimmei, Toru*; et al.
Proceedings of the National Academy of Sciences of the United States of America, 119(40), p.e2208717119_1 - e2208717119_6, 2022/10
Times Cited Count：2 Percentile：20.4(Multidisciplinary Sciences)Here we present the first elucidation of the disordered structure of ice VII, the dominant high-pressure form of water, at 2.2 GPa and 298 K from both single-crystal and powder neutron diffraction techniques. We reveal the three-dimensional atomic distributions from the maximum entropy method and unexpectedly find a ring-like distribution of hydrogen in contrast to the commonly-accepted discrete sites. In addition, total scattering analysis at 274 K clarified the difference in the intermolecular structure from ice VIII, the ordered counterpart of ice VII, despite an identical molecular geometry. Our complementary structure analyses robustly demonstrate the unique disordered structure of ice VII. Furthermore, these noble findings are related to the proton dynamics which drastically vary with pressure, and will contribute to an understanding of the structural origin of anomalous physical properties of ice VII under pressures.
Kume, Etsuo; Kitamura, Tatsuaki*; Takase, Kazuyuki; Ose, Yasuo*
Kashika Joho Gakkai-Shi, 25(Suppl.2), p.369 - 370, 2005/10
no abstracts in English
Takeda, Masayasu; Endo, Yasuo*; Kamijo, Atsushi*; Langridge, S.*; Dalgliesh, R.*; Her, J. H.*; Lee, K. B.*
Transactions of the Materials Research Society of Japan, 28, p.23 - 26, 2003/11
no abstracts in English
Akino, Norio; Kubo, Shinji; Takase, Kazuyuki; Hino, Ryutaro; Choi, K.*
Nihon Kikai Gakkai Ryutai Kogaku Bumon Koenkai 2000 Koen Rombunshu (CD-ROM), 4 Pages, 2000/00
no abstracts in English
; *; Ara, Katsuyuki
First US-Japan Symp. on Advances in NDT, 0, p.98 - 103, 1996/00
no abstracts in English
; *; Ara, Katsuyuki
MAG-96-73, 0, p.73 - 82, 1996/00
no abstracts in English
; *; Ara, Katsuyuki
Nihon Oyo Jiki Gakkai-Shi, 20, p.633 - 636, 1996/00
no abstracts in English
; *; Ara, Katsuyuki
Denki Gakkai Rombunshi, A, 115(10), p.999 - 1006, 1995/10
no abstracts in English
; *; Ara, Katsuyuki
MAG-95-77, 0, p.39 - 46, 1995/06
no abstracts in English
; Ara, Katsuyuki; ; *; *
Nihon Oyo Jiki Gakkai-Shi, 19, p.497 - 500, 1995/00
no abstracts in English
; *; Ara, Katsuyuki;
MAG-94-225, 0, 8 Pages, 1994/12
no abstracts in English
Akino, Norio; Takase, Kazuyuki; Kubo, Shinji; Hino, Ryutaro
Dai-26-Kai Ranryu Shimpojiumu Koen Rombunshu 1994, 0, p.176 - 179, 1994/00
no abstracts in English
; *; Ara, Katsuyuki;
Denki Gakkai Magunethikkusu Kenkyukai Shiryo; MAG-97-76, 0, p.9 - 20, 1994/00
no abstracts in English
Ara, Katsuyuki; ; *; *
MAG-93-96, p.11 - 22, 1993/06
no abstracts in English
*; Tone, Tatsuzo; *
Int.J.Numer.Methods Eng., 23, p.1201 - 1216, 1986/00
Times Cited Count：6 Percentile：79.28(Engineering, Multidisciplinary)no abstracts in English
Nihon Kinzoku Gakkai Kaiho, 8(12), p.811 - 819, 1969/00
no abstracts in English
