KINETICS STUDY OF NONISOTHERMAL CRYSTALLIZATION IN SE0.7TE0.3 CHALCOGENIDE GLASS

Differential scanning calorimetry data at different heating rates on Se0.7Te0.3 chalcogenide glass are reported and discussed, From the heating rate dependence of values of T(g), T(c) and T(p), the glass transition activation energy, E(t), and the crystallization activation energy, E(c), were derived. The crystallization data are interpreted in terms of recent analyses developed for non-isothermic crystallization and also for the evaluation of E(c) and the characterization of a crystallization mechanism. The results indicate that bulk crystallization with two-dimensional growth occurs for this glass. The calculated E(t) and E(c) are 143 +/- 3 and 174 +/- 8 kJ/mol, respectively.