Pre-crystallization and crystallization kinetics of some Se-Te-Sb glasses

Abstract

Differential scanning calorimetry results under non-isothermal conditions of the chalcogenide Se80-xTe20Sbx (where x=1.5, 7.5 and 9at.%) glasses are reported and discussed. The models, used for calculating the crystallization kinetics from the exothermic peaks, have been applied to obtain the pre-crystallization kinetics from the endothermic peaks. Increasing Sb content was found to increase the activation energy of glass transition, the activation energy for crystallization and the Avrami index of the investigated glass. Two (two- and three-dimensional growth) mechanisms are working simultaneously during the amorphous-crystalline transformation of the Se78.5Te20Sb1.5 alloy while only one (three-dimensional growth) mechanism is responsible for the crystallization process of the chalcogenide Se71Te20Sb9 glass. © 2002 Elsevier Science B.V. All rights reserved.