Abstract
Tellurite and borotellurite glasses containing Bi2O3 and TiO2 were prepared and structure-property correlations were carried out by density measurements, X-ray Diffraction (XRD), Differential Scanning Calorimetry (DSC), Raman and UV-visible spectroscopy. Titanium tellurite glasses require high melt-cooling rates and were fabricated by splat quenching. On adding B2O3, the glass forming ability (GFA) enhances, and glasses could be synthesized at lower quenching rates. The density of glasses shows a direct correlation with molecular mass of the constituents. UV-visible studies were used to determine the optical band gap and refractive index. Raman studies found that the co-ordination number of tellurium ions with oxygen (NTe-O) decreases with the increase in B2O3 as well as Bi2O3 content while, TiO2 produce only a small decrease in NTe-O, which explains the lower GFA of titanium tellurite glasses that do not contain Bi2O3 and B2O3. DSC studies show that the glass transition temperature (Tg) increases with B2...
Highlights
Tellurium oxide-based glasses have found remarkable technological applications due to their unique physical properties such as high refractive index, non-linear optical properties, high dielectric constant, wide optical transmission window [1]
On adding B2O3, the glass forming ability (GFA) enhances, and glasses could be synthesized at lower quenching rates
Raman studies found that the co-ordination number of tellurium ions with oxygen (NTe-O) decreases with the increase in B2O3 as well as Bi2O3 content while, TiO2 produce only a small decrease in NTe-O, which explains the lower GFA of titanium tellurite glasses that do not contain Bi2O3 and B2O3
Summary
Tellurium oxide-based glasses have found remarkable technological applications due to their unique physical properties such as high refractive index, non-linear optical properties, high dielectric constant, wide optical transmission window [1]. The ternary TeO2-based glassy systems containing TiO2 modifier, jointly with Bi2O3 produces glasses which offer the best compromise on the high nonlinear optical characteristics and the high mechanical and thermal resistance [3]. Bi2O3 is added to borotellurite glass to increase its density and to improve its structural and optical properties. The aim of this work is to study the glass forming ability (GFA) of tellurite and borotellurite glasses containing Bi2O3 and TiO2 and perform structure-property correlations by Differential Scanning Calorimetry (DSC), UV-Visible and Raman Spectroscopy
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