Abstract
The structure and kinetics of the crystallization reaction of amorphous Tes(51.3)As(45.7)Cu(3) were studied under nonisothermal conditions using scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). Two exothermic changes were reported. Five isoconversional methods, of Kissinger-Akahira-Sunose (KAS), Flynn-Wall-Ozawa (FWO), Tang, Starink, and Vyazovkin, were used to determine the variation of the activation energy for crystallization with temperature, E-alpha(T). The results show that the activation energy for crystallization associated with the first peak first decreases with increasing temperature and then increases. Different behaviour was observed for the second peak, where an increase of Ea with temperature followed by a decrease. The effect of heating rate on the reaction model, g(alpha), was also different for the two crystallization peaks.(c) 2008 Elsevier B.V All rights reserved.