Formation and structure of a dense octahedral glass

We have performed in situ x-ray and neutron-diffraction measurements, and molecular dynamics simulations, of GeO2, an archetypal network-forming glass under pressure. Below 5 GPa, additional atoms encroaching on the first tetrahedral shell are seen to be a precursor of local coordination change. Bet...

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Bibliographic Details
Published in:Physical review letters 2004-09, Vol.93 (11), p.115502.1-115502.4, Article 115502
Main Authors: GUTHRIE, M, TULK, C. A, BENMORE, C. J, XU, J, YARGER, J. L, KLUG, D. D, TSE, J. S, MAO, H-K, HEMLEY, R. J
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
DENSITY
Disordered solids
Exact sciences and technology
FABRICATION
GLASS
Glasses
INTENSE PULSED NEUTRON SOURCE
MATERIALS SCIENCE
MICROSTRUCTURE
Physics
Structure of solids and liquids
crystallography
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Summary:We have performed in situ x-ray and neutron-diffraction measurements, and molecular dynamics simulations, of GeO2, an archetypal network-forming glass under pressure. Below 5 GPa, additional atoms encroaching on the first tetrahedral shell are seen to be a precursor of local coordination change. Between 6 and 10 GPa, we observe structures with a constant average coordination of approximately 5, indicating a new metastable, intermediate form of the glass. At 15 GPa, the structure of a fully octahedral glass has been measured. This structure is not retained upon decompression and, therefore, must be studied in situ.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.93.115502