Infrared Spectroscopy Of Germanium Dioxide (Geo2) Glass At High Pressure

Room temperature infrared studies have been performed on GeO2 glass under quasi-hydrostatic pressures of 9.5GPa. The mid-infrared absorption spectrum of GeO2 glass shows two distinct vibrational modes, one at 560cm-1 (mid frequency peak) and another at 870 cm-1 (high frequency peak). At pressures above 6GPa, these two absorption peaks broaden and intensity in the region between them (~700cm-1) increases dramatically. This change in the infrared spectrum at high pressure is interpreted as the onset and progression of the amorphous to amorphous transformation from a low-density tetrahedral glass to a high density octahedral network glass.