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New kinetic model for competitive crystallization: Analysis and application
Year: 2025
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: 117194
Titles:
Language Name Abstract Keywords
cze Nový kinetický model pro kompetitivní krystalizaci: Analýza a aplikace Byl vyvinut nový kinetický model pro případ současného růstu krystalů z povrchových a objemových nukleí. Předpokladem modelu je úplná nukleace na povrchu práškového zrna a částečná nukleace uvnitř. Model umožňuje analyzovat DSC krystalizační křivky a získat velmi snadno rychlost růstu krystalů i počet nukleí v objemu práškového zrna. Analýza na základě tvaru DSC křivky a normalizované Y-funkce byla ověřena na nukleaci Se70Te30 prášků. kinetika krystalizace; nukleace; růst krystalů; sklo; DSC
eng New kinetic model for competitive crystallization: Analysis and application Understanding nucleation and crystal growth in undercooled liquids is crucial in the glass and glass-ceramic industry. We developed a new kinetic model for competitive crystallization involving surface layer growth and internal volume nuclei growth. This model allows the separate determination of crystal growth rate and nucleation density. The crystal growth rate is calculated from the extrapolated beginning of the isothermal DSC curve using crystallization enthalpy and mean powder grain radius. A unique method was developed to determine nucleation process parameters using the master plot of the y-function, applicable to both isothermal and non-isothermal DSC data. Verification with Se70Te30 powder showed excellent agreement with experimental data, matching previously published crystal growth rates. For the first time, we determined the nucleation rate and time lag at 60 degrees C for this glass composition. Introduced methods are straightforward, effective, and applicable to glassy materials with similar crystallization behavior. Crystallization kinetics; Nucleation; Crystal growth; Glass; DSC

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