Crystallization kinetics of a-Se₇₅Te_{25 鈭?#xa0;x}Ga_x (x = 0, 5, 10 and 15 at wt%) glassy system

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• 作者：A.M. Shakra^a ; S.A. Fayek^b ; N.A. Hegab^a ; I.S. Yahia^a ; ^c ; ^{dr_isyahia@yahoo.com} ; ^{dr_isyahia@hotmail.com} ; ^{isyahia@hotmail.com} ; A.M. AL-Ribaty^c
• 关键词：Amorphous Se&ndash ; Te&ndash ; Ga ; Chalcogenide glasses ; Differential thermal analysis ; Crystallization kinetics
• 刊名：Journal of Non-Crystalline Solids
• 出版年：2012
• 期刊代码：50_00223093
• 类别：ms
• 出版时间：1 July, 2012
• 卷：358
• 期：12-13
• 页码：1591-1598
• 文件大小：1695 K

摘要

Bulk glasses of a-Se₇₅Te_{25 鈭?#xA0;x}Ga_x (x = 0, 5, 10 and 15 at wt%) have been prepared by melt quenching technique. These samples were structurally characterized by using X-ray diffraction. Kinetic of crystallization in these glasses was studied under non-isothermal conditions using differential thermal analysis (DTA). DTA is performed at different heating rates of 5, 10, 15, 20 and 30 掳C/min. The values of glass transition (T_g) and crystallization peak temperature (T_p) are found to be composition and heating-rate dependent. The obtained results have been analyzed in terms of activation energy of glass transition (E_g) using Kissinger's and Mahadevan et al. relations. Values of E_g obtained by the two relations are in agreement with each other. The results indicate that the crystallization process is a three-dimensional growth.