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Crystallization kinetics of a-Se

Autoři: Svoboda Roman | Málek Jiří

Rok: 2015

Druh publikace: článek v odborném periodiku

Název zdroje: Journal of Thermal Analysis and Calorimetry

Název nakladatele: Springer

Místo vydání: Heidelberg

Strana od-do: 1363-1372

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
cze	Krystalizační kinetika a-Se	Studium krystalizace amorfního selenu bylo sledováno metodou DSC za izotermních podmínek. Článek je třetím v pořadí týkajícím se popisu kinetiky komplexního procesu krystalizace. Izotermní kinetika krystalizace byla popsána nukleačně růstovým modelem JMA s využitím dekonvoluce krystalizačních píků.	izotermní krystalizační kinetika; DSC: JMA model; Se sklo; dekonvoluce
eng	Crystallization kinetics of a-Se	Differential scanning calorimetry was used to study crystallization behavior in selenium glass under isothermal conditions. In the current work, which is the third in a sequence of articles dealing with the crystallization kinetics of complex processes, the isothermal crystallization kinetics was described in terms of the Johnson-Mehl-Avrami nucleation-growth model. The study was performed in dependence on particle size so that the advanced interpretation of characteristic kinetic functions could be employed. The complexity of the crystallization process was found to be represented by overlapping competing surface and bulk nucleation-growth mechanisms. Based on this information, the deconvolution in terms of the Johnson-Mehl-Avrami process was performed, separating the mechanisms involved. High consistency of the resulting kinetic parameters confirms the accuracy and physical meaningfulness of the deconvolution procedure. The resulting concept not only describes the isothermal crystallization process in glassy selenium very well, both qualitatively and quantitatively, but is also capable of explaining all accessible data from the literature on this topic. In addition, comparisons of the present and literature data clearly imply that the nucleation processes play a major role in the isothermal crystallization of amorphous selenium.	Isothermal crystallization kinetics; DSC; JMA model; Se glass; Deconvolution

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