open access

https://hdl.handle.net/2115/78988

Computational searches for crystal structures of dioxides of group 14 elements (CO2, SiO2, GeO2) under ultrahigh pressure

英語

2020-06-09

Royal Society of Chemistry

RSC advances

10(37)

22156-22163

In this study, we focused on the effect of pressure on the crystal structures of dioxides of group 14 elements,i.e.SiO2, GeO2, and CO2. Systematic searches for their crystal structures using the artificial force induced reaction method generated 219 and 147, 102 and 63, and 148 and 76 structures for SiO2, GeO2, and CO2, respectively, at 1 and 10(6)atm. At 1 atm, cristobalite-like, quartz, anatase-like, and stishovite were stable structures for SiO(2)and GeO2. At 10(6)atm, structures of stishovite and CaCl(2)type were relatively stable for SiO(2)and GeO2. At 1 atm of CO2, molecular crystals were the most stable, whereas, quartz-like and cristobalite-like structures were obtained as stable structures at 10(6)atm. We discuss these pressure dependent structural variations systematically using the obtained structural dataset.

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