Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 113, Issue 13, Pages 3436-3441Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1524304113
Keywords
high pressure; polyamorphism; glass; oxygen packing
Categories
Funding
- Department of Energy (DOE)-National Nuclear Security Administration [DE-NA0001974]
- DOE-Office of Basic Energy Sciences [DE-FG02-99ER45775]
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
- GeoSoilEnviroCARS
- National Science Foundation-Earth Sciences [EAR-1128799]
- Department of Energy-GeoSciences [DE-FG02-94ER14466]
- National Science Foundation [EAR-1214376]
- Grants-in-Aid for Scientific Research [15K17784] Funding Source: KAKEN
- Directorate For Geosciences
- Division Of Earth Sciences [1620548] Funding Source: National Science Foundation
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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 similar to 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 = similar to 0.74), which provides new insights into structural changes in network-forming glasses and liquids with CN higher than 6 at ultrahigh-pressure conditions.
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