Abstract: Raman spectra of ${\mathrm{GeO}}_{2}$ glass are recorded in situ as a function of pressure to 56 GPa at room temperature. Under initial compression to 6 GPa the main 419-${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ Raman band shifts to higher frequency and broadens with a gradual loss of intensity. These spectral changes are consistent with an increase in distortion of ${\mathrm{GeO}}_{4}$ tetrahedra and a decrease in the intertetrahedral bond angle with pressure. Between 6 and 13 GPa (the pressure range of the reported fourfold- to sixfold-coord...
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Topics: 
Crystallography
Nuclear magnetic resonance