Kinetics of non-isothermal crystallization of ternary Se80Te20−xZnx glasses

The crystallization kinetics of Se80Te20−xZnx with x = 0.5, 1.0, 1.5, 2.0 and 2.5 chalcogenide glasses were investigated using non-isothermal crystallization approach. The glass transition temperature (Tg) and crystallization temperature (Tc) of these glasses were determined using the differential scanning calorimeter at different heating rates. The dependence of Tg and Tc on the heating rate (β) has been used for the determination of the activation energy of crystallization (Ec), the activation energy of structural relaxation (Et), crystallization enthalpy (ΔHc) and the Avrami exponent (n). It was found that the enthalpy released is minimum at 2.5% of Zn, hence, the glass with 2.5% of Zn is most stable in the Se80Te20−xZnx system. The crystallization kinetics for the glasses was studied by using the modified Kissinger and Ozawa equations.