Crystallization kinetics and Avrami index of Sb-doped Se-Te-Sn chalcogenide glasses

Bulk amorphous samples of Sb-substituted Se78-xTe20Sn2Sbx (0<x<6) have been prepared using melt quench technique. The structure of Se78-xTe20Sn2Sbx (x = 0, 2, 4, 6) glassy alloys has been investigated using X-ray diffraction technique. Calorimetric studies of the prepared samples have been performed under non-isothermal conditions using differential scanning calorimetry (DSC) and glass transition temperature as well as crystallization temperature has been evaluated using DSC scans. The activation energy of crystallization kinetics (E-c) has been determined using model-free approaches such as Kissinger, Ozawa, Tang and Starink methods. The Avrami index (n) and frequency factor (K-o) have been calculated by Matusita and Augis-Benett method.