Experimental evidence of tetrahedral symmetry breaking in SiO₂ glass under pressure.

ABSTRACT: Bimodal behavior in the translational order of silicon's second shell in SiO₂ liquid at high temperatures and high pressures has been recognized in theoretical studies, and the fraction of the S state with high tetrahedrality is considered as structural origin of the anomalous properties. However, it has not been well identified in experiment. Here we show experimental evidence of a bimodal behavior in the translational order of silicon's second shell in SiO₂ glass under pressure. SiO₂ glass shows tetrahedral symmetry structure with separation between the first and second shells of silicon at low pressures, which corresponds to the S state structure reported in SiO₂ liquid. On the other hand, at high pressures, the silicon's second shell collapse

SUBMITTER: Kono Y 

PROVIDER: S-EPMC9051114 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature