A Raman study of pressure-densified vitreous silica

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Abstract
We have obtained polarized Raman spectra for vitreous silica densified at 3.95 GPa and 530 °C. The glass spectra show considerable changes on densification, which are discussed in terms of the observed reduction in average intertetrahedral bond angle and the central force model for connected networks. The results of this densification experiment are compared with previous work at high pressure but room temperature. This comparison suggests a model for the densification mechanism, and indirectly supports recent structural interpretations of the Raman spectrum of fused silica.