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Structural characterization and topological threshold in chalcogenide GexSb40-xSe60 glasses

Z. G. IVANOVA1,* , E. CERNOSKOVA2, К. МЕLАNОVA2

Affiliation

  1. Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chausse Blvd., 1784 Sofia, Bulgaria
  2. Joint Laboratory of Solid State Chemistry of Institute of Macromolecular Chemistry, Academy of Sciences, Czech Republic, v.v.i and University of Pardubice, Studentská 84, 53210 Pardubice, Czech Republ

Abstract

The compositional dependences of some basic thermal properties of bulk GexSb40-xSe60 glasses have been evaluated, taking into consideration the average coordination number (Z). In particular, the glass transition temperature (Tg), softening temperature (Ts), coefficient of thermal expansion in glass (αg), specific heat capacity (ΔCp) and fragility (m) have been investigated by a complex application of differential thermal and thermomechanical analyses, X-ray diffraction and differential scanning calorimetry as well. The obtained peculiarities in their change at Z ~ 2.67 have been discussed in terms of topological structural transitions in chalcogenide glasses..

Keywords

Chalcogenide glasses, X-ray diffraction, Thermal properties.

Submitted at: July 9, 2008
Accepted at: Oct. 7, 2008

Citation

Z. G. IVANOVA, E. CERNOSKOVA, К. МЕLАNОVA, Structural characterization and topological threshold in chalcogenide GexSb40-xSe60 glasses, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 10, pp. 2762-2764 (2008)