Nonisothermal crystallisation kinetics of amorphous selenium prepared by high-energy ball milling: A comparison with the melt-quenching and thin-film techniques

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• 作者：A.A. Joraid ; ^{aaljoraid@taibahu.edu.sa} ; S.N. Alamri ; A.A. Abu-Sehly¹ ; M. Benghanem
• 关键词：Mechanical alloying ; Quenching ; Thin films ; Differential scanning calorimetry (DSC) ; Amorphous materials
• 刊名：Journal of Non-Crystalline Solids
• 出版年：2012
• 期刊代码：50_00223093
• 类别：ms
• 出版时间：15 May, 2012
• 卷：358
• 期：10
• 页码：1268-1273
• 文件大小：1279 K

摘要

Differential scanning calorimetry (DSC) studies were performed under nonisothermal conditions at various heating rates for glassy Se made by high-energy ball milling. Comparisons were made between the ball-milling technique and the melt-quenching and thin-film techniques. Well-defined endothermic and exothermic peaks were observed at the glass-transition temperature, T_g, and the onset temperature of crystallisation, T_c. The isoconversional method of Vyazovkin was used to determine the variation in the activation energy for crystallisation with temperature, E_伪(T). The value of E_伪(T) was dependent on the sample preparation method. The thermal stability of the Se glasses was evaluated by calculation of the temperature difference (T_c 鈭?#xA0;T_g) and the S-parameter. In addition, the glass-forming ability was estimated by the criteria of reduced glass-transition temperature, T_rg, and the Hruby number, H_R. The structures of the Se samples that resulted from the DSC analysis were identified using an X-ray diffractometer. The glasses formed using the thin film technique were the most stable.