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Article

X-ray and Neutron Study on the Structure of Hydrous SiO2 Glass up to 10 GPa

1
Department of Earth Sciences, Okayama University, Okayama 700-8530, Japan
2
Department of Earth and Planetary Systems Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
3
Geodynamics Research Center, Ehime University, Matsuyama 790-8577, Japan
4
J-PARC Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan
5
Research Center for Advanced Measurement and Characterization, National Institute for Materials Science (NIMS), Sayo, Hyogo 679-5148, Japan
6
Diffraction and Scattering Division, Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan
7
Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
8
Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society, Tokai 319-1106, Japan
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(1), 84; https://doi.org/10.3390/min10010084
Received: 15 December 2019 / Revised: 14 January 2020 / Accepted: 16 January 2020 / Published: 20 January 2020
(This article belongs to the Special Issue Mineral Physics—In Memory of Orson Anderson)
The structure of hydrous amorphous SiO2 is fundamental in order to investigate the effects of water on the physicochemical properties of oxide glasses and magma. The hydrous SiO2 glass with 13 wt.% D2O 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 two phases: a major phase rich in SiO2 and a minor phase rich in D2O molecules distributed as small domains with dimensions of less than 100 Å. Medium-range order of the hydrous glass shrinks compared to the anhydrous SiO2 glass by disruption of SiO4 linkage due to the formation of Si–OD deuterioxyl, while the response of its structure to pressure is almost the same as that of the anhydrous SiO2 glass. Most of D2O molecules are in the small domains and hardly penetrate into the void space in the ring consisting of SiO4 tetrahedra. View Full-Text
Keywords: hydrous silica glass; medium-range order; first sharp diffraction peak; phase separation; small angle X-ray scattering; X-ray diffraction; neutron diffraction; high pressure hydrous silica glass; medium-range order; first sharp diffraction peak; phase separation; small angle X-ray scattering; X-ray diffraction; neutron diffraction; high pressure
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MDPI and ACS Style

Urakawa, S.; Inoue, T.; Hattori, T.; Sano-Furukawa, A.; Kohara, S.; Wakabayashi, D.; Sato, T.; Funamori, N.; Funakoshi, K.-i. X-ray and Neutron Study on the Structure of Hydrous SiO2 Glass up to 10 GPa. Minerals 2020, 10, 84. https://doi.org/10.3390/min10010084

AMA Style

Urakawa S, Inoue T, Hattori T, Sano-Furukawa A, Kohara S, Wakabayashi D, Sato T, Funamori N, Funakoshi K-i. X-ray and Neutron Study on the Structure of Hydrous SiO2 Glass up to 10 GPa. Minerals. 2020; 10(1):84. https://doi.org/10.3390/min10010084

Chicago/Turabian Style

Urakawa, Satoru; Inoue, Toru; Hattori, Takanori; Sano-Furukawa, Asami; Kohara, Shinji; Wakabayashi, Daisuke; Sato, Tomoko; Funamori, Nobumasa; Funakoshi, Ken-ichi. 2020. "X-ray and Neutron Study on the Structure of Hydrous SiO2 Glass up to 10 GPa" Minerals 10, no. 1: 84. https://doi.org/10.3390/min10010084

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