Abstract
Calorimetric studies of chalogenide alloy glasses, (GeSe 2) 60(GeTe) 40 − x (Sb 2Te 3) x obtained by water quenching at room temperature, have been performed by isothermal and continuous heating in a Perkin-Elmer DSC-2 calorimeter. The samples show a simple peaked crystallization exotherm when x = 0, 10 and two stage crystallization for x = 20. The results obtained in both iso- and non-iso-thermal experiments have been successfully interpreted with the same set of kinetic parameters. Among the several kinetic models which we analysed, the best fit to our experimental data has been obtained in the case of the Johnson-Mehl-Avrami-Erofe'ev equation, with values of the kinetic exponent dependent only on composition. The effective activation energy decreases slowly from E = (229 ± 6)kJ/mol at x = 0 to E = (184 ± 5)kJ/mol at x = 20 (first crystallization peak).
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