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Thermal coefficients of linear expansion of noncrystalline chalcogenides in the As-S-Ge-Er system

V. B. PETROVIĆ1, S. R. LUKIĆ1,* , M. V. ŠILJEGOVIĆ1, F. SKUBAN1

Affiliation

  1. Department of Physics, Faculty of Sciences, Trg Dositeja Obradovića 4, 21000 Novi Sad, Serbia

Abstract

The paper describes the results of a study of glasses of the type [(As2S3)x(GeS2)1-x]1-y(Er2S3)y for x=30 and 40 at % with Er =1 at % by the method of thermomechanical analysis. Values of the thermal coefficients of linear expansion in solid ( g α ) and visco-plastic ( ω α ) phase were determined. On the basis of results obtained using the mentioned methods, it was possible to determine the specific temperature of beginning of the softening process of the glass ( g T ), as well as the temperature of the beginning of the deformation ( ω T ). It was shown that the linear coefficients essentially depend on the glass system composition, i.e. on the fact wether structural network contains erbium. Specific temperatures are also functions of content of some components in material as it can be expected in disordered systems..

Keywords

Chalcogenide glasses, Thermal coeffiicient, Glass-transition temperature, Glass deformation temperature.

Submitted at: Nov. 2, 2006
Accepted at: April 15, 2007

Citation

V. B. PETROVIĆ, S. R. LUKIĆ, M. V. ŠILJEGOVIĆ, F. SKUBAN, Thermal coefficients of linear expansion of noncrystalline chalcogenides in the As-S-Ge-Er system, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 4, pp. 825-827 (2007)