IR ABSORPTION AND RAMAN SCATTERING OF WATER IN PHOSPHATE GLASSES: SIMILARITY AND DIFFERENCES

Abstract

The broad absorption band of water in phosphate glass near 3000 cm^-1contains several components belonging to different bonds of water ions. To determine the relation of these components, IR. absorption spectra in a broadened interval (up to 1400 cm^-1) and Raman scattering spectra of the same samples were measured. All the measurements were collated with quantitative determinations of water content in the studied glasses that was done by means of nuclear microanalysis methods. A pilot decomposition of Raman band of water in vitreous LiPO₃ was done using the same procedure as for the IR spectra. The calculated components show that the positions of the hydrogen-containing groups are similar in the Raman and the IR. spectra, however, their intensities being in inverse dependence. Furthermore, the Raman scattering bands are clearly different in the meta- and poly-phosphate regions. Of great importance is also the kind of the metal cation in the phosphate.