Structural changes of quartz-type crystalline and vitreous GeO2 under pressure
- 1 March 2001
- journal article
- amorphous glass-and-liquids
- Published by International Union of Crystallography (IUCr) in Journal of Synchrotron Radiation
- Vol. 8 (2) , 791-793
- https://doi.org/10.1107/s0909049500018306
Abstract
Using a large volume high pressure apparatus, quartz-type crystalline GeO2 and Li2O-4GeO2 glass have been compressed up to 14 GPa at room temperature and their local structural changes have been investigated by an in-situ XAFS method. In quartz-type crystalline GeO2, the change of the coordination number from 4 to 6 begins above 8 GPa and finishes below 12 GPa. On decompression, reversal transition begins below 8 GPa and there is a large hysteresis. Almost no sixfold coordination of Ge is preserved after releasing pressure. Change of coordination number in vitreous Li2O-4GeO2 begins above 6 GPa and is completed below 10 GPa. Reversal transition begins below 10 GPa and the hysteresis is smaller than that of quartz-type GeO2. Change of coordination number in vitreous Li2O-4GeO2 is also reversal.Keywords
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