Electronic bonding transition in compressed SiO2 glass

Jung Fu Lin, Hiroshi Fukui, David Prendergast, Takuo Okuchi, Yong Q. Cai, Nozomu Hiraoka, Choong Shik Yoo, Andrea Trave, Peter Eng, Michael Y. Hu, Paul Chow

    Research output: Contribution to journalArticlepeer-review

    82 Citations (Scopus)

    Abstract

    Knowledge of the electronic structure of amorphous and liquid silica at high pressures is essential to understanding their complex properties ranging from silica melt in magma to silica glass in optics, electronics, and material science. Here we present oxygen near K -edge spectra of SiO2 glass to 51 GPa obtained using x-ray Raman scattering in a diamond-anvil cell. The x-ray Raman spectra below ∼10 GPa are consistent with those of quartz and coesite, whereas the spectra above ∼22 GPa are similar to that of stishovite. This pressure-induced spectral change indicates an electronic bonding transition occurring from a fourfold quartzlike to a sixfold stishovitelike configuration in SiO2 glass between 10 GPa and 22 GPa. In contrast to the irreversible densification, the electronic bonding transition is reversible upon decompression. The observed reversible bonding transition and irreversible densification call for a coherent understanding of the transformation mechanism in compressed SiO2 glass.

    Original languageEnglish
    Article number012201
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume75
    Issue number1
    DOIs
    Publication statusPublished - 2007

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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