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Thermal behavior of Se-rich Ge2Sb2Se(5-y)Tey chalcogenide system
Year: 2015
Type of publication: článek v odborném periodiku
Name of source: Journal of Alloys and Compounds
Publisher name: Elsevier Science SA
Place: Lausanne
Page from-to: 287-298
Titles:
Language Name Abstract Keywords
cze Tepelné chování chalkogenidového systému Ge2Sb2(5-y)Tey v oblasti bohaté na Se Skelný přechod, strukturní relaxace, studená krystalizace a tání byly studovány pro Se-bohatá skla systému Ge2Sb2Se(5-y)Tey (kompozičního analogu známého PCM materiálu GST-225). Ge-Sb-Se-Te skla; tepelná kapacita; skelný přechod; krystalizační kinetika; sklotvornost
eng Thermal behavior of Se-rich Ge2Sb2Se(5-y)Tey chalcogenide system The thermal behavior of the Ge2Sb2Se(5-y)Tey chalcogenide system (a compositional analog of the famous GST-225 PCM material) was thoroughly studied. Glass transition, cold crystallization, and melting phenomena were investigated in dependence on composition and various experimental conditions (heating rate, particle size). The kinetics of the structural relaxation and crystallization processes are described in terms of the Tool-Narayanaswamy-Moynihan and Autocatalytic models. The complexity of these processes is thoroughly discussed with regard to the compositionally given changes of molecular structures. Heat capacity measurements were performed for the compositions with y = 0, 0.5, and 1 in the 50-550 degrees C temperature range. All glassy and crystalline C-p dependences were found to be identical within the experimental error. The compositional dependence of the P-type undercooled liquid C-p evolution was found to contribute significantly to the changes in glass-forming ability (GFA). The GFA trend was discussed in terms of the mutual interplay between the thermodynamics and kinetics in this system. Ge-Sb-Se-Te glasses; Heat capacity; Glass transition; Crystallization kinetics; Glass-forming ability

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