Calorimetric studies of the crystallization growth process in glassy $Se_{70}Te_{30-x}Ag_x$ alloys

Özet

Differential Scanning Calorimetry (DSC) is performed at different heating rates under non-isothermal conditions to study the crystallization kinetics of $Se_{.70}Te_{.26-x}Ag_{.04}$ 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 Ec is equal to the activation energy for growth process $E_G$.