Thermal characterization of glasses from Fe–Sb–S–I system

详细信息    查看全文

• 作者：Goran Štrbac ; Dragana Štrbac…
• 关键词：Chalcogenide glasses ; Glass transition ; Activation energy ; Crystallization process ; DSC
• 刊名：Journal of Thermal Analysis and Calorimetry
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：127
• 期：1
• 页码：247-254
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Physical Chemistry; Analytical Chemistry; Polymer Sciences; Inorganic Chemistry; Measurement Science and Instrumentation;
• 出版者：Springer Netherlands
• ISSN：1588-2926
• 卷排序：127

文摘

Thermal characterization of glasses from the Fe_x[(Sb₂S₃)_0.75(SbSI)_0.25)]_100−x system, for x = 0, 0.01, 0.1, 0.5, 0.8, 2, 3 and 5 at.%, in the temperature range from 300 to 770 K, was done. The DSC recordings, obtained at different heating rates, revealed three processes: glass transition, crystallization of the corresponding crystalline phases and melting of formed crystalline phases. The glass transition process was characterized with two parameters: onset glass transition temperature T_g and apparent activation energy of glass transition E_g. Also, the effect of increasing the content of iron in the glass composition on the T_g value was determined. The complex crystallization process corresponds to the crystallization of at least two crystalline phases: SbSI and Sb₂S₃. Due to the considerable overlapping of the exothermic peaks, crystallization kinetics was done for Sb₂S₃ crystalline phase in the compositions with 0.01 and 0.5 at.% of iron. Analysis was carried out by using the Johnson–Mehl–Avrami theoretical model under non-isothermal conditions. The apparent activation energy of crystal growth E_c and the value of the Avrami index n were determined. The value of Avrami index n was determined by using the Matusita–Sakka theory. It has been shown that volumetric nucleation and three-dimensional growth occur. The shape of endothermic peaks on curves, which appear behind the crystallization processes, indicated the simultaneously progress of a multiple processes. It has been found that in addition to the melting of the SbSI phase, the process of thermal decomposition of the glass also begins at given temperatures.