Experimental evidence of tetrahedral symmetry breaking in SiO2 glass under pressure

Yoshio Kono (), Koji Ohara, Nozomi M. Kondo, Hiroki Yamada, Satoshi Hiroi, Fumiya Noritake, Kiyofumi Nitta, Oki Sekizawa, Yuji Higo, Yoshinori Tange, Hirokatsu Yumoto, Takahisa Koyama, Hiroshi Yamazaki, Yasunori Senba, Haruhiko Ohashi, Shunji Goto, Ichiro Inoue, Yujiro Hayashi, Kenji Tamasaku, Taito Osaka, Jumpei Yamada and Makina Yabashi
Additional contact information
Yoshio Kono: Geodynamics Research Center, Ehime University
Koji Ohara: Japan Synchrotron Radiation Research Institute
Nozomi M. Kondo: Geodynamics Research Center, Ehime University
Hiroki Yamada: Japan Synchrotron Radiation Research Institute
Satoshi Hiroi: Japan Synchrotron Radiation Research Institute
Fumiya Noritake: Graduate Faculty of Interdisciplinary Research, University of Yamanashi
Kiyofumi Nitta: Japan Synchrotron Radiation Research Institute
Oki Sekizawa: Japan Synchrotron Radiation Research Institute
Yuji Higo: Japan Synchrotron Radiation Research Institute
Yoshinori Tange: Japan Synchrotron Radiation Research Institute
Hirokatsu Yumoto: Japan Synchrotron Radiation Research Institute
Takahisa Koyama: Japan Synchrotron Radiation Research Institute
Hiroshi Yamazaki: Japan Synchrotron Radiation Research Institute
Yasunori Senba: Japan Synchrotron Radiation Research Institute
Haruhiko Ohashi: Japan Synchrotron Radiation Research Institute
Shunji Goto: Japan Synchrotron Radiation Research Institute
Ichiro Inoue: RIKEN SPring-8 Center
Yujiro Hayashi: RIKEN SPring-8 Center
Kenji Tamasaku: RIKEN SPring-8 Center
Taito Osaka: RIKEN SPring-8 Center
Jumpei Yamada: RIKEN SPring-8 Center
Makina Yabashi: RIKEN SPring-8 Center

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: 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.

Date: 2022
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DOI: 10.1038/s41467-022-30028-w

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