Brillouin Scattering in Densified GeO2 Glasses

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Abstract
Brillouin and Raman scattering measurements have been applied for the investigation of GeO2 glasses densified under high pressures up to 9 GPa at 673 K. The density of obtained glasses increases with an increase of applied pressure. It increases significantly around 3 GPa, however, shows a peak at 6 GPa. A significant increase is also observed in hypersonic wave velocity, and longitudinal and shear moduli around 3 GPa. These results are well explained by amorphous-amorphous transition. In Raman scattering measurement, vibrational modes illustrate continuous changes of local structures with increasing applied pressures up to 9 GPa. Boson peaks show a maximum around 3 GPa, which indicates the minimum correlation length. These data suggest a change in the intermediate-range structure.