Experimental evidence of tetrahedral symmetry breaking in SiO2 glass under pressure

Author:

Kono YoshioORCID,Ohara KojiORCID,Kondo Nozomi M.,Yamada Hiroki,Hiroi Satoshi,Noritake Fumiya,Nitta Kiyofumi,Sekizawa Oki,Higo Yuji,Tange YoshinoriORCID,Yumoto HirokatsuORCID,Koyama Takahisa,Yamazaki Hiroshi,Senba Yasunori,Ohashi Haruhiko,Goto Shunji,Inoue Ichiro,Hayashi Yujiro,Tamasaku Kenji,Osaka Taito,Yamada Jumpei,Yabashi MakinaORCID

Abstract

AbstractBimodal 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.

Funder

MEXT | Japan Society for the Promotion of Science

Publisher

Springer Science and Business Media LLC

Subject

General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry,Multidisciplinary

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