Abstract
The infrared response of twenty silicate glasses deduced both from a Kramers-Kronig analysis and from a fit of dielectric function model to simulate infrared reflectivity spectra in the wavenumber range 20–4000 cm −1 is compared with Raman spectra of the same samples in polarized light. Galeenar and Lucovsky first noted that peaks corresponding to transverse and lingitudinal optic modes deduced from the analysis of infrared reflectivity spectra appear in the Raman spectra of vitreous SiO 2 and GeO 2. In the present paper this result is confirmed for SiO 2, but no similar correspondence of infrared and Raman mode is observed in any of the silicate glasses investigated. Infrared and Raman responses in fact appear more and more different as the percentage of SiO 2 in the glass is reduced. Effective ionic charges of oxygen are deduced from infrared data and found to increase significantly with the decrease of the fraction of glass former constituents.
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