Calorimetric studies of the crystallization process in Cu 10Se 90 and Cu 20Se 80 chalcogenide glasses

Abstract

The crystallization kinetics of Cu 10Se 90 and Cu 20Se 80 glasses at different heating rates have been studied by differential scanning calorimetry (DSC). The crystallization phases resulting from the DSC have been identified using X-ray diffraction (XRD). The DSC thermograms have been analyzed in terms of the activation energy, stability and dimensionality of growth by different models. Results of DSC are reported and discussed from the heating rates’ dependence of values of the glass transition temperature ( T g) and the peak temperature of crystallization ( T p). The characteristic temperatures of the studied chalcogenide glasses has been used to evaluate the glass-forming ability (GFA) by using various thermal stability parameters such as Hruby's criterion ( H R). The activation energy for glass ( E g) and the crystallization activation energy ( E c) are derived. The crystallization results are interpreted in terms of recent analyses developed for non-isothermal crystallization and also for the evaluation of ( E c). The average value of the Avrami exponent comes out to be 3, indicating that, the crystallization process takes place via three-dimensional growth with bulk crystallization.