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- Title
Experimental evidence of tetrahedral symmetry breaking in SiO<sub>2</sub> glass under pressure.
- Authors
Kono, Yoshio; Ohara, Koji; Kondo, Nozomi M.; Yamada, Hiroki; Hiroi, Satoshi; Noritake, Fumiya; Nitta, Kiyofumi; Sekizawa, Oki; Higo, Yuji; Tange, Yoshinori; Yumoto, Hirokatsu; Koyama, Takahisa; Yamazaki, Hiroshi; Senba, Yasunori; Ohashi, Haruhiko; Goto, Shunji; Inoue, Ichiro; Hayashi, Yujiro; Tamasaku, Kenji; Osaka, Taito
- 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 collapses onto the first shell, and more silicon atoms locate in the first shell. These observations indicate breaking of local tetrahedral symmetry in SiO2 glass under pressure, as well as SiO2 liquid. Understanding the structural origin of the anomalous properties of SiO2 liquid and glass at high pressures is fundamental in wide range of scientific fields. Here, the authors find experimental evidence of a bimodal behavior in the translational order of silicon's second shell and breaking of local tetrahedral symmetry in SiO2 glass under pressure.
- Subjects
SYMMETRY breaking; GLASS; SUPERCOOLED liquids; HIGH temperatures; SILICON
- Publication
Nature Communications, 2022, Vol 13, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-022-30028-w