Abstract
The influence of TiO2 on the glass structure in the CaO-SrO-B2O3-SiO2 (CSrBS) system was examined by Raman spectroscopy. The Raman spectra of these glasses presented bending vibrational modes and stretching vibration of Qn species (where n is the number of bridging oxygen atoms shared between tetrahedra), leading to the identification of Q1, Q2, Q2–A, and Q3 species. The addition of Ti produced two new Raman bands at 756 and 825 cm−1 which were attributed, respectively, to the stretching vibrations of Ti-ONBO and Ti-OBO. Our results suggest that titanium is coordinated mainly in Ti[4] species, with negligible amounts of Ti[5] units. The intensity of Si-O-Si bending bands shows a decrease in intensity, which is attributed to the restriction of bending motions, possibly due to titanium bonding to the network structure through both vertices and edges.
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