Journal article Open Access

Formation and Structure of a Dense Octahedral Glass

Guthrie, M.; Ca, Tulk; Tulk, C. A.; Benmore, C. J.; Xu, J.; Yarger, J. L.; Klug, Dennis D.; Tse, J. S.; Mao, H.-K.; Hemley, R. J.

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 ?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. ; system details: machine converted author identifier PE to PID, February 2012

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