Temperature dependence of Raman spectra of vitreous and molten B2O3

For network-forming components, we develop a model of the phonon-assisted structural transition between the configurations of atoms, which allows for quantitative predictions of the liquid-glass transition. This model is based on our investigation that shows that vitreous B2O3 consists of planar triangles (BO3) and boroxol rings (B3O6) The model closely predicts the temperature dependence of the intensities and the frequency shift of characteristic Raman spectra of vitreous and molten B2O3. The temperature dependence of the half-width of the 808 cm(-1) mode is also derived, and the Raman line shape of this mode is found to be Gaussian.