Publication detail

Influence of DSC thermal lag on evaluation of crystallization kinetics

Authors: Svoboda Roman | Perez Maqueda Luis | Podzemná Veronika | Perejon Antonio | Svoboda Ondřej

Year: 2020

Type of publication: článek v odborném periodiku

Name of source: Journal of Non-Crystalline Solids

Publisher name: Elsevier Science BV

Place: Amsterdam

Page from-to: "119738-1"-"119738-7"

Titles:

Language	Name	Abstract	Keywords
cze	Vliv DSC tepelné setrvačnosti na vývoj krystalizační kinetiky	Pomocí diferenční skenovací kalorimetrie byl sledován vliv přidaného tepelného odporu na měřená kinetická data pro krystalizaci sklovitého Se70Te30.	krystalizační kinetika; tepelná setrvačnost; tepelný transport; Se70Te30 sklo; DSC
eng	Influence of DSC thermal lag on evaluation of crystallization kinetics	Influence of added thermal resistance on crystallization kinetics, as measured by differential scanning calorimetry (DSC), of the Se70Te30 glass was studied. The increase of thermal resistance was achieved by adding polytetrafluorethylene discs of different thicknesses (up to 0.5 mm) in-between the DSC platform and the pan with sample. Increase of the thermal resistance led to an apparent decrease (by more than 30%) in the crystallization enthalpy. Significant change of model-free kinetics occurred: apparent activation energy E of the crystallization process decreased (by more than 20%) due to the DSC data being progressively shifted to higher temperatures with increasing heating rate. The model-based kinetics was changed only slightly; the DSC peaks retained their asymmetry and the choice of the appropriate model was not influenced by the added thermal resistance. The temperature shift caused by added thermal lag was modeled for the low-to-moderate heating rates.	Crystallization kinetics; Thermal lag; Heat transfer; Se70Te30 glass; DSC

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