Abstract
Infrared and Raman spectra of vitreous silica and sodium silicates containing various concentrations of Ti were studied. Vibrational bands associated with the titanium groups, TiO4 tetrahedra and TiO6 octahedra, were identified. From structural symmetry and selection rule arguments, the TiO2 tetrahedra were found to exist in vitreous silica and the TiO2 tetrahedra and TiO6 octahedra to coexist in vitreous sodium silicates as a titanium group. With increasing titanium content in TiO2-SiO2 glasses, the concentration of TiO4 tetrahedra increased. With increasing sodium content in TiO2-Na2O-SiO2 glasses, the concentration of the TiO4 tetrahedra decreased and that of the TiO6 octahedra increased.
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