Thermal Characterization of Se<sub>80-x</sub>Te<sub>20</sub>In<sub>x</sub>Glasses Using Iso-Conversional Methods

• 作者: Ashok Kumar Pragya Agarwal Renu Shukla
• 来源期刊: 结晶过程及技术期刊(英文)
• 学科: 化学
• 关键词: CRYSTALLIZATION Kinetics DSC Iso-Conversional METHODS
• 年，卷（期）: 2012,（2）
• 页码范围: 64-71
• 页数: 8页
• 分类号: O6

摘要

Alloys of Se80-xTe20Inx 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 (Tg) and crystallization temperature (Tc). From DSC scans, Tc is obtained at dif- ferent heating rates (5, 10, 15, 20, 25 K/min). It is observed that Tc increases with increasing heating rate for a particular glassy alloy. Activation energy of crystallization (Ec) 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 Ec is dependent on extent of crystallization (α). Activation energy is also found to vary with atomic percentage of In in ternary Se80-xTe20Inx glassy system. The compositional dependence of Ec shows a re-versal in the trend at x = 15 in Se80-xTe20Inx, which is explained in terms of mechanically stabilized structure at this composition.