Abstract
Abstract We compare the changes with thermal treatments of the first-order Raman spectra of different silicate glasses. The low-frequcncy Raman scattering of pure silica glass is shown to have an anomalous behaviour with fictive temperature (like other macroscopic properties) compared with E glass. This behaviour is correlated with the viscosity of silica glass. It is further shown that the boson peak is not correlated quantitatively with the macroscopic sound velocity but more probably to the heterogeneous disorder of the glass through local elastic constants or a characteristic length.
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