Dataset: Glass-forming ability and structural features of melt-quenched and gel-derived SiO2-TiO2 glasses
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Research data for Manuscript submission with title <strong>Glass-forming ability and structural features of melt-quenched and gel-derived SiO<sub>2</sub>-TiO<sub>2</sub> glasses</strong> <strong>Abstract</strong> SiO<sub>2</sub>-TiO<sub>2 </sub>glasses produced by melt-quenching or sol-gel spray-drying were compared to highlight their structural differences. Glass formation was possible by melt-quenching up to 10 mol% TiO<sub>2</sub>, while higher contents led to devitrification. Raman spectroscopy and solid-state <sup>17</sup>O and <sup>29</sup>Si MAS NMR confirmed the clear emergence of Ti-O-Si bonds and a tetrahedral oxygen coordination of Ti<sup>4+</sup> leading to full network connectivity, as also substantiated by the synthesis of TiO<sub>2</sub>-doped cristobalite. In gel-derived glasses, water content induced partial network depolymerization, thereby enhancing the solubility of TiO<sub>2</sub> in the hydrous silicate matrix. However, full dehydration during heating proved challenging due to the competing devitrification tendency: the glass-forming range in the anhydrous binary SiO<sub>2</sub>-TiO<sub>2</sub> system does not therefore appear to be significantly enlarged by the sol-gel synthesis route.
