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Title

Influence of DSC thermal lag on evaluation of crystallization kinetics

AuthorsSvoboda, R.; Pérez-Maqueda, Luis A. ; Podzemná, V.; Perejón, Antonio ; Svoboda, O.
KeywordsThermal lag
kinetic analysis
DSC
JMA model
Chalcogenide glass
Issue Date2020
PublisherElsevier BV
CitationJournal of Non-Crystalline Solids 528 (2020)
AbstractInfluence of added thermal resistance on crystallization kinetics, as measured by differential scanning calorimetry (DSC), of the SeTe 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.
Publisher version (URL)http://dx.doi.org/10.1016/j.jnoncrysol.2019.119738
URIhttp://hdl.handle.net/10261/206292
Identifiersdoi: 10.1016/j.jnoncrysol.2019.119738
issn: 0022-3093
Appears in Collections:(ICMS) Artículos
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