Room temperature infrared studies have been performed on GeO2 glass under quasi-hydrostatic pressures of 9.5 GPa. The mid-infrared absorption spectrum of GeO2 glass (g-GeO2) shows two distinct vibrational modes, one at 560 cm-1 (mid frequency peak) and another at 870 cm-1 (high frequency peak). At pressures above 6 GPa, these two absorption peaks broaden and intensity in the region between them (∼700 cm-1) increases dramatically. We interpret this change in the infrared spectrum at high pressure as the onset and progression of the amorphous to amorphous transformation from a low-density tetrahedral glass to a high density octahedral network glass.
|Number of pages
|Physics and Chemistry of Glasses
|Published - Aug 2005
ASJC Scopus subject areas
- Ceramics and Composites
- Physical and Theoretical Chemistry