Analysis of crystallization in Sb2Se98 composition

General Approach to the Nucleation and Crystal Growth in Sb0.5Se99.5 Glass Explaining the Shape of DSC Curves

“…The second peak is calculated for low particle sizes using JMA model too but the symmetric Gaussian function must be applied to fit well the experimental data for bulk and the highest particle size samples. Similar result of deconvolution process was also obtained for Sb 2 Se 98 material 21 .…”

“…A similar result of the deconvolution process was also obtained for Sb 2 Se 98 material. 21 Nevertheless, the application of Gaussian function does not contribute to the interpretation of crystal growth mechanism and does not even explain the huge difference in the shape of DSC curves with particle size. Moreover, the value of the kinetic exponent of the JMA model for samples with lower particle sizes is about 4 and higher, which is too high for chalcogenide material and is almost at the limit of the believable value connected with the crystal growth mechanism.…”

“…Several kinetic models and their parameters are related with the concept of crystal growth mechanism 10,13 . In the case of overlapping peaks, the full kinetic analysis can be performed after the deconvolution process, which can be done by numerical fitting using a general equation describing various shapes of DSC peaks such as FraserSuzuki function (only for nonisothermal conditions) [17][18][19] or deconvolution based on selected function [20][21][22] . The analysis of overlapping DSC or DTA peaks, without deconvolution, can be done partially when only the value of activation energy is determined from nonisothermal measurements [23][24][25] but the information about crystal growth morphology and mechanism is missing.…”

“…Crystallization in the Sb−Se system observed by differential scanning calorimetry (DSC) indicates the presence of overlapping peaks caused by crystallization of Sb 2 Se 3 and crystallization of Se on the surface and in the volume of studied samples. 21,30 However, some authors observed only a single peak. 31,32 So, one of the main aims of this work was to perform an extended study of crystallization in Sb−Se system with low addition of antimony.…”

“…The procedure of kinetic analysis of a single peak is well-known, , where the determination of activation energy is followed by selection of appropriate kinetic model, and after that, parameters of the selected model are determined. Several kinetic models and their parameters are related with the concept of the crystal growth mechanism. , In the case of overlapping peaks, the full kinetic analysis can be performed after the deconvolution process, which can be done by numerical fitting using a general equation describing various shapes of DSC peaks such as Fraser–Suzuki function (only for non-isothermal conditions) − or deconvolution based on selected function. − The analysis of overlapping DSC or DTA peaks, without deconvolution, can be done partially when only the value of activation energy is determined from non-isothermal measurements, − but the information about the crystal growth morphology and mechanism is missing. However, some papers include the deconvolution procedure followed by full kinetic analysis. − Nevertheless, deconvolution of data obtained under isothermal conditions , can be performed using the selected kinetic model, which can significantly influence the interpretation of mechanism of crystallization.…”