Publication detail

Amorphous-to-crystalline transition in Te-doped Ge2Sb2Se5 glass

Year: 2014

Type of publication: článek v odborném periodiku

Name of source: Journal of Thermal Analysis and Calorimetry

Publisher name: Springer

Page from-to: 1073-1083

Titles:

Language	Name	Abstract	Keywords
cze	Přechod sklo-krystal v Te dopovaném Ge2Sb2Se5 skle	Pomocí DSC byla studována krystalizace sklovitého Ge2Sb2Se4.5Te0.5 za neizotermních podmínek. Byla popsána krystalizační kinetika pomocí autokatalytického modelu Sestak-Berggren. Výsledky byly diskutovány.	krystalizace; sklo; Ge-Sb-Se; Te dotace
eng	Amorphous-to-crystalline transition in Te-doped Ge2Sb2Se5 glass	Differential scanning calorimetry (DSC) was used to study crystallization in Ge2Sb2Se4.5Te0.5 glass under non-isothermal conditions. The crystallization kinetics was described in terms of the autocatalytic estak-Berggren model. An extensive discussion of all aspects of a full-scale kinetic study for a crystallization process was undertaken. In particular, the effect of Te a dagger" Se substitution on the complexity of the crystallization process was analyzed. The addition of tellurium enhances bulk crystallization originating from volume nuclei at the expense of the surface/defects-based crystallization mechanism. Significantly higher activation energy in the case of the Te-doped material was attributed to the larger mass of the combined Se-Te chains and the larger spatial restrictions for their movement. On the other hand, the slightly lower crystallization temperature of the Te-doped glass corresponds to its higher tendency for crystallization. A supplemental X-ray diffraction study confirmed the findings obtained by DSC.	Crystallization kinetics; DSC; Autocatalytic model; XRD; Ge2Sb2Se4.5Te0.5 glass

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