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glass up to 10 GPaUrakawa, Satoru*; Inoue, Toru*; Hattori, Takanori; Sano, Asami; Kohara, Shinji*; Wakabayashi, Daisuke*; Sato, Tomoko*; Funamori, Nobumasa*; Funakoshi, Kenichi*
Minerals (Internet), 10(1), p.84_1 - 84_13, 2020/01
Times Cited Count：9 Percentile：64.36(Geochemistry & Geophysics)The structure of hydrous amorphous SiO is fundamental to investigate the effects of water on the physicochemical properties of oxide glasses and magma. The hydrous SiO glass with 13 wt.% DO was synthesized under high-pressure and high-temperature conditions and its structure was investigated by small angle X-ray scattering, X-ray diffraction, and neutron diffraction experiments at pressures of up to 10 GPa and room temperature. This hydrous glass is separated into a SiO rich major phase and a DO rich minor phase. Medium-range order of the hydrous glass shrinks compared to the anhydrous SiO glass due to disruption of SiO
linkage by formation of Si-OD deuterioxyl, while the pressure response is similar. Most of DO molecules are in the small domains and hardly penetrate into SiO major phase.
Irifune, Tetsuo*; Kuroda, Koji*; Nishiyama, Norimasa*; Inoue, Toru*; Funamori, Nobumasa*; Uchida, Takeyuki*; Yagi, Takehiko*; Utsumi, Wataru; Miyajima, Nobuyoshi*; Fujino, Kiyoshi*; et al.
Geophysical Monograph 101 (Properties of Earth and Planetary Materials at High Pressure and Temperature), p.1 - 8, 1998/00
no abstracts in English
Hattori, Takanori; Mori, Tetsuji*; Narushima, Takashi*; Funamori, Nobumasa*; Tsuji, Kazuhiko*
no journal, ,
In the previous studies for the pressure-induced structural changes in liquids of tetrahedrally bonded materials, the followings are elucidated. (1) With increasing pressure, the anisotropy in local structures becomes smaller and liquids approach simple liquid metals. (2) The pressure-induced changes become less prominent and the liquids take a unique structure which does not change by compression. (3) As a result, the liquid preserves anisotropy in the local structure at pressures where the crystalline counterpart loses the anisotropy. In our previous studies, the pressure-induced changes were analyzed with the distorted crystalline model. However, this model assumes the existence of the crystalline-type local structure. In the present study, we analyzed it with a RMC method, which does not involve such assumption. Based on the results, we discuss the high-pressure evolution of the local structures in the liquids.
