Glass transition and crystallization study of Te additive Se Bi chalcogenide glass

Abstract

© 2014 Elsevier B.V. The crystallization kinetics of Se90Bi10and Se85Bi5Te10chalcogenide glasses has been studied and discussed using Differential Thermal Analysis (DTA) under a non-isothermal condition at different heating rates. Different methods were used to deduce the values of activation energy of glass transition Egand activation energy of crystallization Ecbased on heating rate dependence of characteristic temperatures such as glass transition temperature Tg, onset crystallization temperature Tcand peak crystallization temperature Tp. Both values of Egand Ecare found to be heating rate and composition dependent. According to Avrami index n, the crystallization mechanism was interpreted as three-dimensional growth for binary Se90Bi10and two-dimensional growth for ternary Se85Bi5Te10compositions. Some kinetic parameters, the Hruby number Hr, glass formation ability (GFA), and the temperature difference (Tc-Tg), the reduced glass transition temperature Trgand thermal stability S are studied as functions of heating rates and compositions.