On the evaluation of the nonisothermal kinetic parameters of (GeS2)0.3(Sb2S3)0.7 crystallization using the IKP method

The isoconversional method suggested by Friedman and the invariant kinetic parameters method (IKP) were used in order to examine the kinetics of the nonisothermal crystallization of (GeS2)(0.3)(Sb2S3)(0.7). The objective of the paper is to show the usefulness of the IKP method both for determining the activation parameters as well as the model of the investigated process. It was shown that the kinetic triplet [(E, A, f (alpha), where E is the activation energy, A is the preexponential factor, and f (alpha) is the differential function of conversion], which results through the application of the IKP method, depends on the set of kinetic models considered. For different sets of kinetic models, proportional values of f (alpha) are obtained. A criterion for the selection of this set, the use of which lead to the true kinetic triplet corresponding to the analyzed process (E = 163.2 kJ mol(-1); A = 2.47 x 10(12) min(-1) and the Avrami-Erofeev model, A(m), for m = 2.5-2.6 was suggested. (C) 2004 Wiley Periodicals, Inc.