Glass transformation temperature and stability of tellurite glasses

The glass transformation (T_g) and onset crystallization temperatures (T_x) of (100 – x) TeO₂–(x)V₂O₅, (x = 10, 35, and 50 mol%) glasses were measured in the temperature range 300–800 K by differential scanning calorimetry at different heating rates. From the variation of the heating rate, the glass transition activation energy was calculated by different methods. The glass stabilization range S = T_x – T_g was calculated for the whole glass series. Quantitative analysis of the glass transformation temperature was carried out using the calculated number of bonds per unit volume and oxygen packing density.