Publikace detail

Non-isothermal crystallization kinetics of GeTe4 infrared glass

Autoři: Svoboda Roman | Brandová Daniela | Málek Jiří

Rok: 2016

Druh publikace: článek v odborném periodiku

Název zdroje: Journal of Thermal Analysis and Calorimetry

Název nakladatele: Springer

Místo vydání: Heidelberg

Strana od-do: 195-204

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
cze	neizotermní krystalizační kinetika GeTe4 infračervených skel	Vliv velikosti části na krystalizační kinetiku GeTe4 byl studován metodou DSC. Získaná komplexní data byla zpracována dekonvolucí metodou Fraser-Suzuki. Krystalizační podprocesy byly identifikovány a popsány kinetickými modely JMA a AC.	krystalizační kinetika; DSC; XRD; GeTe4 sklo
eng	Non-isothermal crystallization kinetics of GeTe4 infrared glass	Non-isothermal crystallization kinetics of the GeTe4 chalcogenide glass was studied in dependence on particle size. Complexity of the obtained DSC data was treated by means of the Fraser-Suzuki deconvolution, and the particular crystallization sub-processes were identified and described in terms of the JMA(2) and AC kinetic models. Bulk as-prepared GeTe4 samples, on the other hand, exhibited simple zero-order (F0) crystallization kinetics. The marked difference between the powder and bulk crystallization mechanisms was explained based on the mechanically induced defects and heterogeneities, which surrogate/accelerate the primary nucleation process. This concept also accounts for the remarkable stability of the studied telluride glass. Precipitation of Te followed by second-stage GeTe crystal growth was confirmed by XRD for all of the applied experimental conditions. The dominant influence of the nucleation process on the consequent crystallization kinetics is thereby implicated. Infrared microscopy was used to confirm the existence of the particular crystallization mechanism.	Crystallization kinetics; DSC; XRD; GeTe4 glass

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