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As2Se3 melt crystallization studied by quadratic approximation of nucleation and growth rate temperature dependence
Authors: Chovanec Jozef | Chromčíková Mária | Pilný Petr | Shánělová Jana | Málek Jiří | Liška Marek
Year: 2013
Type of publication: článek v odborném periodiku
Name of source: Journal of Thermal Analysis and Calorimetry
Publisher name: Springer
Page from-to: 971-977
Titles:
Language Name Abstract Keywords
cze Krystalizace taveniny As2Se3 studovaná kvadratickou aproximací teplotní závislosti nukleační a růstové rychlosti Krystalizace v tavenine As2Se3 byla měřena pomocí DSC při konstantní rychlosti ohřevu. Nelineární regresní analýza teplotní závislosti konverze byla zpracována na základě modelu klasické nukleační teorie podporující normální 3D růst. Parametry teplotní závislosti nukleace a rychlosti růstu krystalů byly stanoveny v tříkrokovém procesu. DSC; nukleace; růst krystalů; selenid arsenitý
eng As2Se3 melt crystallization studied by quadratic approximation of nucleation and growth rate temperature dependence The constant heating rate crystallization of As2Se3 undercooled melt was measured by the differential scanning calorimetry. The nonlinear regression analysis of conversion temperature dependence was performed in frame of the classical nucleation theory supposing the normal 3D growth. The parameters of temperature dependence of nucleation rate and growth rate were determined by three step process. First the simple parabolic model was used to estimate the maximum and width of nucleation/growth rate temperature dependence. Then the obtained parabolic curves were fitted by the theoretical ones. In the third step, the obtained parameters were used as zero estimates for nonlinear regression analysis of experimental data. The results obtained by using conversion degree alpha were compared with the results obtained by using the -ln(1 - alpha) transformed function. Although both treatments give comparable results the use of -ln(1 - alpha) input data is preferred due to better numerical stability of nonlinear regression treatment. DSC; nucleation; crystal growth; arsenic triselenide

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