Activation energy of Se2Ge0.2Sb0.8 chalcogenide glass by differential scanning calorimetry

Results of differential scanning calorimetry (DSC) at different heating rates on Se₂Ge_0.2Sb_0.8 chalcogenide glass are reported and discussed. As the heating rate () changed, also the glass transition temperature (T_g) and onset temperature of crystallization (T_c) changed. As the value of the transition activation energyE_t changed, the crystallization fraction (), heat flow (_q and the crystallization peak temperature (T_p) also changed. The value of the effective activation energy of crystallizationE_c was calculated by means of six different methods. The Se₂Ge_0.2Sb_0.8 chalcogenide glass has two crystallization mechanisms, a one-dimensional and an other surface crystallization growth. The average value ofE_t for Se₂Ge_0.2Sb_0.8 is equal to 194.95±3.9 kJ·mol^–1 and the average value ofE_c is equal to 164±3.3 kJ·mol^–1.