Thermal properties of multicomponent tellurite glass

Quaternary tellurite glass systems of the form 80TeO2–5TiO2–(15 - x)WO3 - xAnOm where AnOm 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 Tg, crystallization temperature Tc, and the onset of crystallization temperature Tx were determined. The glass stability against crystallization S (&100 C) and glass-forming tendency Kg (&0.3) have been calculated. Specific heat capacity Cp (C1.4 J/g C) was measured from room temperature and above the Tg 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 nc (C2.4), number of bonds per unit volume nb (C8 9 1028 cm-3), and the average stretching force constant (F) have been studied for every glass composition.