Thermal properties of multicomponent tellurite glass

Quaternary tellurite glass systems of the form 80TeO₂–5TiO₂–(15 − x)WO₃ − xA_nO_m where A_nO_m is Nb₂O₅, Nd₂O₃, and Er₂O₃, x = 0.01, 1, 3, and 5 mol% for Nb₂O₅ and x = 0.01, 0.1, 1, 3, 5, and 7 mol% for Nd₂O₃ and Er₂O₃, have been prepared by the melt quenching. Density and molar volumes have been measured and calculated for every glass system. The thermal behavior of the glass series was studied by using the differential thermal analysis DSC. Glass transition temperature T _g, crystallization temperature T _c, and the onset of crystallization temperature T _x were determined. The glass stability against crystallization S (≈100 °C) and glass-forming tendency K _g (≈0.3) have been calculated. Specific heat capacity C _p (≥1.4 J/g °C) was measured from room temperature and above the T _g for every composition in each glass series. Quantitative analysis of the above thermal properties of these new tellurite glass with the structure parameters like average cross-link density \( \ifmmode\expandafter\bar\else\expandafter\=\fi{n}_{{\text{c}}} \) (≥2.4), number of bonds per unit volume n _b (≥8 × 10²⁸ cm⁻³), and the average stretching force constant (F) have been studied for every glass composition.