The Temperature Interval of the Existence of Ferroelectric Centers in the Amorphous Fe-Sb-S-I System

Petrović, D. M.; Gúth, I.O.; Lukić, S. R.; Garić, Maja

doi:10.4028/www.scientific.net/msf.321-324.531

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“…For the sample with 5 at.% of iron, there is a rapid jump in glass transition temperature. This is most likely related to substantial changes in the structure of these glasses considering that X-ray diffractograms of the composition with 5 at.% of iron showed diffraction peaks corresponding to FeS crystal [27]. If the sensitivity of the X-ray diffraction method is taken into account, it can be estimated that the proportion of this crystalline phase is significant.…”

Section: Resultsmentioning

confidence: 98%

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

Štrbac

Lukić-Petrović

et al. 2016

J Therm Anal Calorim

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Thermal characterization of glasses from the Fe x [(Sb 2 S 3 ) 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 Sb 2 S 3 . Due to the considerable overlapping of the exothermic peaks, crystallization kinetics was done for Sb 2 S 3 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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Section: Resultsmentioning

confidence: 98%