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Evaluation of Crystallization Kinetic and Thermodynamic Parameters of Ge–Se–Sn Glassy Alloys

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Ge30−x Se70Sn x (x = 8, 11, 14, 17 and 20 at.%) glassy alloys were successfully prepared via melt quenching processes. X-ray diffraction technique has been employed for the characterization of the samples. Non-isothermal measurements have been performed at five different heating rates (10, 15, 20, 25 and 30 Kmin−1) using Differential Scanning Calorimetry (DSC) technique. The effective activation energy E α (KJmole−1), Avrami exponent n(α) and pre-exponential factor A(α) have been evaluated at different a to analyze the non-isothermal crystallization process of these glasses. E α has been determined using the iterative Kissinger, FWO and Friedman model. The analysis of the evaluated data shows that Eα varies with α as well as with T. Some thermodynamics functions like specific heat and difference in entropy, Enthalpy and Gibbs free energy of glassy and crystalline phase have also been investigated. The highest value of entropy difference between the glass and the crystalline state ΔS gc (Jg−1K−1), confirms that the composition Ge22Se70Sn8 glass is the most stable over the other samples of the series.
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Keywords: Activation Energy; Avrami Exponent; Pre-Exponential Factor; Thermodynamics

Document Type: Research Article

Affiliations: Semi-Conductor and Polymer Science Laboratory, Department of Physics, University of Rajasthan, Jaipur 302004, India

Publication date: November 1, 2016

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