Ultrahigh-pressure polyamorphism in GeO2 glass with coordination number >6

Yoshio Kono, Curtis Kenney-Benson, Daijo Ikuta, Yuki Shibazaki, Yanbin Wang, Guoyin Shen, Alexandra Navrotsky

研究成果: Article査読

67 被引用数 (Scopus)


Knowledge of pressure-induced structural changes in glasses is important in various scientific fields as well as in engineering and industry. However, polyamorphism in glasses under high pressure remains poorly understood because of experimental challenges. Here we report new experimental findings of ultrahigh-pressure polyamorphism in GeO2 glass, investigated using a newly developed double-stage large-volume cell. The Ge-O coordination number (CN) is found to remain constant at ∼6 between 22.6 and 37.9 GPa. At higher pressures, CN begins to increase rapidly and reaches 7.4 at 91.7 GPa. This transformation begins when the oxygen-packing fraction in GeO2 glass is close to the maximal dense-packing state (the Kepler conjecture = ∼0.74), which provides new insights into structural changes in network-forming glasses and liquids with CN higher than 6 at ultrahigh-pressure conditions.

ジャーナルProceedings of the National Academy of Sciences of the United States of America
出版ステータスPublished - 2016 3月 29

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