Abstract
Thermal characterization of glasses from the Fex[(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.
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Acknowledgements
The authors would like to acknowledge Professor I. O. Gut for synthesis of glasses of the investigated system. The work is a part of scientific projects financed by the Provincial Secretariat for Science and Technological Development of the Government of Vojvodina and by the Ministry of Education, Science and Technological Development of the Republic of Serbia.
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Štrbac, G., Štrbac, D., Lukić-Petrović, S. et al. Thermal characterization of glasses from Fe–Sb–S–I system. J Therm Anal Calorim 127, 247–254 (2017). https://doi.org/10.1007/s10973-016-5382-1
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DOI: https://doi.org/10.1007/s10973-016-5382-1