High-Pressure Behavior of SiO<sub>2</sub> Glass

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  • SATO Tomoko
    Department of Earth and Planetary Systems Science, Hiroshima University

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  • 高圧力下における SiO<sub>2</sub> ガラスの振る舞い
  • 受賞記念解説 高圧力学会奨励賞 高圧力下におけるSiO₂ガラスの振る舞い
  • ジュショウ キネン カイセツ コウアツリョク ガッカイ ショウレイショウ コウアツリョク カ ニ オケル SiO ₂ ガラス ノ フルマイ
  • High-Pressure Behavior of SiO2 Glass

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Abstract

The high-pressure behavior of SiO2 glass has attracted considerable attention because of its importance not only in condensed-matter physics and materials science but also in geophysics. We have conducted X-ray absorption/diffraction measurements and optical-microscope observation to understand the behavior of SiO2 glass under hydrostatic and uniaxial compression. SiO2 glass undergoes pressure-induced structural transformations first in the intermediate-range order (the network structure consisting of SiO4 tetrahedra) and then in the short-range order (the coordination number). Under uniaxial compression, the atomic arrangement in intermediate-range order deforms largely and a large differential strain remains after decompression. This article attempts to review these interesting behaviors, mainly based on our recent researches.<br>

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