Calorimetric Studies of the Crystallization Growth Process in Glassy Se_{70}Te_{30-x}Ag_x Alloys


Abstract: Differential Scanning Calorimetry (DSC) is performed at different heating rates under non-isothermal conditions to study the crystallization kinetics of Se_{.70}Te_{.26}Ag_{.04} and Se_{.70}Te_{.24}Ag_{.06} chalcogenide glasses in terms of the activation energy of nucleation and growth process. To understand the nucleation and growth process, the values of the growth morphology parameter n and the numerical factor m of crystallization mechanism have been evaluated using different non--isothermal methods. The values of n and m have been found to be nearly equal, indicating that the present glasses have sufficient nuclei before DSC experiment and the activation energy for nucleation process E_N is zero. Hence, the effective activation energy for overall crystallization E_c is equal to the activation energy for growth process E_G.

Keywords: Chalcogenide glasses, Differential Scanning Calorimetry, Crystallization Kinetics.

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