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Extended study of crystallization kinetics for Se-Te glasses
Year: 2013
Type of publication: článek v odborném periodiku
Name of source: Journal of Thermal Analysis and Calorimetry
Publisher name: Springer
Page from-to: 161-171
Titles:
Language Name Abstract Keywords
cze Podrobná studie krystalizační kinetiky pro Se-Te skla Krystalizační kinetika vybraných skel složení Se-Te byla studována za neizotermních podmínek v závislosti na velikosti částic pomocí diferenciální skenovací kalorimetrie. Cílem článku bylo demonstrovat rozšiřující informace dosažitelné pomocí moderní kinetické analýzy prováděné pomocí DSC a navrhnout její důležitost pro vývoj nových, vysoce technických PCM materiálů. kinetika krystalizace; DSC; JMA model; Se(1-y)Tey
eng Extended study of crystallization kinetics for Se-Te glasses Crystallization kinetics of chosen compositions from Se-Te glassy system were studied under non-isothermal conditions depending on particle size using differential scanning calorimetry. The purpose of this article is to demonstrate the extent of information accessible by the modern kinetic analysis provided by the differential scanning calorimetry, and to suggest its importance and merit for the development of new, high-tech PCM materials. The crystallization kinetics was described in terms of the nucleation-growth Johnson-Mehl-Avrami model. Complexity of the crystallization process was in this case represented by very closely overlapping consecutive competing surface and bulk nucleation-growth mechanisms. Mutual interactions of both mechanisms as well as all other observed effects were explained in terms of thermal gradients, surface crystallization centers arising from the sample preparation treatments, and changing amount of volume nuclei originating from the combination of pre-nucleation period, and the very glass preparation phase. Accent was laid on the merits resulting from interpretations of characteristic kinetic functions. A new criterion for quick determination of the dominating crystallization mechanism-surface or bulk-was introduced. crystallization kinetics; DSC; JMA model; Se(1-y)Tey

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