Recent Brillouin experiments on a-SiO₂ have shown that it undergoes an amorphous- to amorphous-phase transition as a function of pressure. Here we report Brillouin scattering results from a-GeO₂, a-As₂{S}₃$, a-${B}₂O₃, and a polymeric glass. Irreversible effects under pressure are found for a-GeO₂ and a-B₂{O}₃$ which we also interpret as due to phase transitions. The polymeric glass and a-${As}₂S₃ show no evidence of unusual behavior.
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Grimsditch et al. (1988) studied this question.
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