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Enthalpy relaxation in Ge-Se glassy system

Authors: Svoboda Roman | Málek Jiří

Year: 2013

Type of publication: článek v odborném periodiku

Name of source: Journal of Thermal Analysis and Calorimetry

Publisher name: Springer

Page from-to: 831-842

Titles:

Language	Name	Abstract	Keywords
cze	Entalpická relaxace ve sklech systému Ge-Se	Meření metodou DSC bylo použito ke studiu entalpické relaxace ve sklech systému GeySe(1-y). Testovaná složení byla v rozsahu y = 0 - 15. Na základě fitovacích a nefitovacích metod vyhodnocení získaných dat bylo popsáno relaxační chování pomocí TNM modelu. Vývoj TNM parametrů s rostoucím obsahem germania byl interpretován v rámci konceptu pohybu příležitostně propojených Se polymerních řetězců.	entalpická relaxace; DSC; TNM model; Ge-Se skla
eng	Enthalpy relaxation in Ge-Se glassy system	Differential scanning calorimetry measurements were used to study enthalpic structural relaxation in the GeySe(100 - y) glassy system. The examined compositional range was 0 a parts per thousand currency sign y a parts per thousand currency sign 15. Based on the results of both, fitting and non-fitting methods, the description of relaxation behavior was obtained in terms of the Tool-Narayanaswamy-Moynihan (TNM) model. Evolution of TNM parameters with increasing germanium content was interpreted within the conception of movements of occasionally linked Se polymeric chains continuously transiting toward rather independent positional changes within heavily inter-linked segments or clusters. As such, the interpretation represents a novel approach associating a phenomenological description with factual changes in molecular structure of the material. In addition, new non-fitting method is introduced, based on the examination of the overall shape of relaxation peak and its comparison to the simulated data.	enthalpic relaxation; DSC; TNM model; Ge-Se glasses