Crystallization study of Se86Sb14 glass: A new method to determine the kinetic exponent (n) with high accuracy

被引：0
作者：
Aly K.A. [1 ,2 ]
机构：
[1] Physics Department, Faculty of Science and Arts, University of Jeddah, Khulais, Jeddah
[2] Physics Department, Faculty of Science, Al-Azhar University, Assiut Branch, Assiut
来源：
Journal of Thermal Analysis and Calorimetry | 2017年 / 129卷 / 2期
关键词：
Chalcogenides; Crystallization kinetics; Melt quenching; Non-isothermal method;
D O I：
10.1007/s10973-017-6283-7
中图分类号：
学科分类号：
摘要：
The present study concerns with high-accuracy determination of crystallization activation energy (Ec), the frequency factor (k0), the kinetic exponent (n) for Se86Sb14 glass. Different three methods have been used to investigate the Ecandk0 values. It was found that the deduced value of k0 based on Kissinger’s method is too small compared with the others. Therefore, it can’t be used to investigate k0 value. Where Ecandk0 values are already known, the overall reaction rate k= k0exp (- Ec/ (R· T)) at any temperature can be calculated. Now, Avrami’s equation (χ= 1 - exp (- (kt) n)) contains only one unknown which is the kinetic exponent (n). This method enables us to determine n value without any approximations. The values’ crystallization fraction (χth) that theoretically calculated is the same as that experimentally investigated (χexp.). © 2017, Akadémiai Kiadó, Budapest, Hungary.
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页码：709 / 714
页数：5
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