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Thermal behavior in Se-Te chalcogenide system: Interplay of thermodynamics and kinetics
Year: 2014
Type of publication: článek v odborném periodiku
Name of source: Journal of Chemical Physics
Publisher name: American Institute of Physics
Place: Melville
Page from-to: "224507-1"-"224507-10"
Titles:
Language Name Abstract Keywords
cze Tepelné chování Se-Te chalkogenidových systémů: Spojení termodynamiky a kinetiky Tepelná kapacita sklovitých a krystalických materiálů Se-Te s obsahem telluru 0-30 at.% byla měřena v rozsahu 230-630 K. tepelná kapacita; krystal; sklo; Se-Te; skelný přechod
eng Thermal behavior in Se-Te chalcogenide system: Interplay of thermodynamics and kinetics Heat capacity measurements were performed for Se, Se90Te10, Se80Te20, and Se70Te30 materials in the 230-630 K temperature range. Both glassy and crystalline C-p dependences were found to be identical within the experimental error. The compositional dependence of the N-type undercooled liquid C-p evolution was explained on the basis of free-volume theory; vibrational and chemical contributions to heat capacity were found to be roughly similar for all Se-Te compositions. The thermal behavior in the Se-Te chalcogenide system was thoroughly studied: glass transition, cold crystallization, and melting were investigated in dependence on composition and various experimental conditions (heating rate, particle size, and pre-nucleation period). The kinetics of the structural relaxation and crystallization processes are described in terms of the Tool-Narayanaswamy-Moynihan and Johnson-Mehl-Avrami models. The complexity of these processes is thoroughly discussed with regard to the compositionally determined changes of molecular structures. The discussion is conducted in terms of the mutual interplay between the thermodynamics and kinetics in this system. (C) 2014 AIP Publishing LLC. crystallization kinetics; heat-capacity; liquid selenium; structural relaxation; glassy system; phase-change; A-SE; tellurium; transition; alloys

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