Journal
PHYSICAL REVIEW B
Volume 81, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.054105
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Funding
- NNSA CDAC [DE-FC52-08NA28554]
- U. S. DOE ANL [DE-AC02-06CH11357]
- U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001057]
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The effects of high pressures on the structure of silica glass have been elucidated using high-energy x-ray diffraction up to 43.5 GPa. A decrease in the first two peak positions in the real-space pair-distribution functions up to 15 GPa indicates an initial shrinkage of the tetrahedral units. Above this threshold pressure the Si-O bond peak shape becomes asymmetric and the average Si-O bond length and coordination number both increase linearly with pressure. Also, strained geometries in the O-O correlations lead a pronounced topological rearrangement of the second and third nearest neighbors.
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