Abstract
Crystallization process of Se85-xTe15Sbx (x = 2.7, 7.5, 10 and 15 at %) chalcogenide glasses has been studied by using differential scanning calorimetry (DSC) with different heating rates. These glasses are found to have a double glasses transition and overlapped crystalline phases for Se70Te15Sb15 glass while single glasses transition and single crystallization stage for other glasses. Glass transition temperature, T-g, onset crystallization temperature, T-c, and peak crystallization temperature, T-p, are found to be dependent on composition and heating rates. Values of various kinetic parameters such as activation energy of glass transition, E-g, activation energy of crystallization, E-c, Hurby number, H-r, thermal stability, S-p, rate constant, K-p, and Avrami exponent, n, are determined for the present systems. Results indicate that rate of crystallization is dependent on thermal stability and glass-forming ability. Crystallization mechanism occurs in two dimensions for studied compositions. Crystalline phases resulting from DSC and scanning electron microscopy have been identified by using X-ray diffraction.