Thermal Characterization of Se_80-xTe₂₀In_x Glasses Using Iso-Conversional Methods

Renu Shukla, Pragya Agarwal, Ashok Kumar

Department of Physics, D. B. S. College, Kanpur, India;.
Department of Physics, Harcourt Butler Technological Institute, Kanpur, India..

DOI: 10.4236/jcpt.2012.22009                

Abstract

Alloys of Se_80-xTe₂₀In_x glassy system are obtained by quenching technique and crystallization kinetics has been studied using Differential Scanning Calorimetric [DSC] technique. Well defined endothermic and exothermic peaks are ob- served at glass transition temperature (T_g) and crystallization temperature (T_c). From DSC scans, T_c is obtained at dif- ferent heating rates (5, 10, 15, 20, 25 K/min). It is observed that T_c increases with increasing heating rate for a particular glassy alloy. Activation energy of crystallization (E_c) has been calculated by different Non-isothermal Iso-conversional methods, i.e., Kissinger-Akahira-Sunose [KAS], Friedman, Flynn-wall-Ozawa [FWO], Friedman-Ozawa [FO] and Sta-rink methods. It is observed that E_c is dependent on extent of crystallization (α). Activation energy is also found to vary with atomic percentage of In in ternary Se_80-xTe₂₀In_x glassy system. The compositional dependence of Ec shows a re-versal in the trend at x = 15 in Se_80-xTe₂₀In_x, which is explained in terms of mechanically stabilized structure at this composition.

Keywords

Crystallization Kinetics; DSC; Iso-Conversional Methods

Conflicts of Interest

The authors declare no conflicts of interest.

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