The vibrational spectra of v-SiO₂and SiO₂-GeO₂glasses

Abstract

The authors have calculated the vibrational densities of states for v-SiO2 and the binary v-SiO2-GeO2 glasses. The results for v-SiO2 are in agreement with the neutron scattering spectrum and previous theoretical calculation of Bell et al. (1972). The spectra of v-SiO2-GeO2 glasses which contain only a small fraction of GeO2 are found to have the general features of v-SiO2, except for a new peak characteristic of Ge doping and a split To-like band which agrees with Raman scattering and can be understood simply by the superposition of the local densities of states of SiO4 and GeO4 tetrahedral with different weights.