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Crystallization of glasses - When to use the Johnson-Mehl-Avrami kinetics?
Authors: Svoboda Roman
Year: 2021
Type of publication: článek v odborném periodiku
Name of source: Journal of the European Ceramic Society
Publisher name: Elsevier Science
Place: Oxford
Page from-to: 7862-7867
Titles:
Language Name Abstract Keywords
cze Krystalizace skel - Kdy použít Johnson-Mehl-Avrami kinetiku? Aplikovateplnost Johnson-Mehl-Avrami kinetického modelu (JMA) byla testována pomocí analýzy nesymetrie píků. Teoretické simulace byly následně analyzovány a popsány JMA modelem spolu s vytvořením grafu funkce z(alfa). Hodnoty korelačních koeficientů byly stanoveny. Na základě analýzy byla doporučena oblast s vysokou mírou přesnosti kinetické predikce. JMA model; teoretická simulace; kinetická predikce
eng Crystallization of glasses - When to use the Johnson-Mehl-Avrami kinetics? Applicability of the Johnson-Mehl-Avrami (JMA) model was tested based on the universal criterion of the kinetic peak asymmetry. Theoretical simulations were used to prepare variety of kinetic peaks with different asymmetries, which were described by the JMA model and the masterplot function z(alpha). Based on the correlation between the simulated crystallization peaks and the JMA description, the following intervals of the degrees of conversion corresponding to the z(alpha) function maxima can be attributed to the respective values of the correlation coefficients: alpha(max,z) = 0.620 - 0.665 corresponds to the better correlation with the JMA model than r(2) = 0.999; alpha(max,z) = 0.585 - 0.705 indicates the correlation better than r(2) = 0.995. These intervals are significantly more lenient than those proposed in the original derivation of the masterplot approach. Even at r(2) = 0.995 the fit by the JMA model provides very accurate kinetic predictions utilizable for preparation of glass-ceramics. JMA model applicability; Theoretical simulation; Kinetic prediction

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