Infrared spectroscopy of germanium dioxide (GeO2) glass at high pressure

Room temperature infrared studies have been performed on GeO 2 glass under quasi-hydrostatic pressures of 9.5 GPa. The mid-infrared absorption spectrum of GeO 2 glass (g-GeO 2 ) shows two distinct vibrational modes, one at560 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.