X-ray and neutron study on the structure of hydrous SiO2 glass up to 10 Gpa

Satoru Urakawa, Toru Inoue, Takanori Hattori, Asami Sano-Furukawa, Shinji Kohara, Daisuke Wakabayashi, Tomoko Sato, Nobumasa Funamori, Ken Ichi Funakoshi

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Article number84
JournalMinerals
Volume10
Issue number1
DOIs
Publication statusPublished - Jan 2020

Keywords

  • First sharp diffraction peak
  • High pressure
  • Hydrous silica glass
  • Medium-range order
  • Neutron diffraction
  • Phase separation
  • Small angle X-ray scattering
  • X-ray diffraction

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Geology

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    Urakawa, S., Inoue, T., Hattori, T., Sano-Furukawa, A., Kohara, S., Wakabayashi, D., Sato, T., Funamori, N., & Funakoshi, K. I. (2020). X-ray and neutron study on the structure of hydrous SiO2 glass up to 10 Gpa. Minerals, 10(1), [84]. https://doi.org/10.3390/min10010084