Ultrahigh-pressure polyamorphism in GeO 2 glass with coordination number >6
Abstract
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. 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.
- Authors:
- Publication Date:
- Research Org.:
- Carnegie Inst. of Science, Argonne, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division; USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
- OSTI Identifier:
- 1241555
- Alternate Identifier(s):
- OSTI ID: 1469294
- Grant/Contract Number:
- FG02-99ER45775; NA0001974; AC02-06CH11357; EAR-1128799; FG02-94ER14466; EAR-1214376
- Resource Type:
- Published Article
- Journal Name:
- Proceedings of the National Academy of Sciences of the United States of America
- Additional Journal Information:
- Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Volume: 113 Journal Issue: 13; Journal ID: ISSN 0027-8424
- Publisher:
- National Academy of Sciences, Washington, DC (United States)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; high pressure; polyamorphism; glass; oxygen packing
Citation Formats
Kono, Yoshio, Kenney-Benson, Curtis, Ikuta, Daijo, Shibazaki, Yuki, Wang, Yanbin, and Shen, Guoyin. Ultrahigh-pressure polyamorphism in GeO 2 glass with coordination number >6. United States: N. p., 2016.
Web. doi:10.1073/pnas.1524304113.
Kono, Yoshio, Kenney-Benson, Curtis, Ikuta, Daijo, Shibazaki, Yuki, Wang, Yanbin, & Shen, Guoyin. Ultrahigh-pressure polyamorphism in GeO 2 glass with coordination number >6. United States. https://doi.org/10.1073/pnas.1524304113
Kono, Yoshio, Kenney-Benson, Curtis, Ikuta, Daijo, Shibazaki, Yuki, Wang, Yanbin, and Shen, Guoyin. Mon .
"Ultrahigh-pressure polyamorphism in GeO 2 glass with coordination number >6". United States. https://doi.org/10.1073/pnas.1524304113.
@article{osti_1241555,
title = {Ultrahigh-pressure polyamorphism in GeO 2 glass with coordination number >6},
author = {Kono, Yoshio and Kenney-Benson, Curtis and Ikuta, Daijo and Shibazaki, Yuki and Wang, Yanbin and Shen, Guoyin},
abstractNote = {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. 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.},
doi = {10.1073/pnas.1524304113},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 13,
volume = 113,
place = {United States},
year = {Mon Mar 14 00:00:00 EDT 2016},
month = {Mon Mar 14 00:00:00 EDT 2016}
}
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https://doi.org/10.1073/pnas.1524304113
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