Properties and structures of TiO2–ZnO–P2O5 glasses

概要

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The glass forming region of TiO2–ZnO–P2O5 glasses was investigated at 1400°C, which is lower than the melting temperature of general titanophosphete glasses. TiO2 could be added up to 15 mol% in the TiO2–ZnO–P2O5 glasses. The glass forming region of 15TiO2–ZnO–P2O5 was quite smaller than that of ZnO–P2O5, and the glasses with TiO2 were colorized by the formation of Ti3+. The refractive index of the glasses increased with increases in the TiO2 concentrations, and the maximum was 1.656. The glass transition temperature, Tg, of the glasses increased with increased TiO2 concentrations, although Tg decreased with increases in the ratio of ZnO to P2O5. Raman spectra of the glasses suggested that P–O–Ti bonds were formed by the addition of TiO2. The increase in Tg and the narrow glass forming region were caused by the formation of strong chemical bonds, P–O–Ti.