Dependence of thermal stability and thermomechanical characteristics of non-crystalline chalcogenides in the Cu-As-Se system on copper content

Summary

The paper describes the results of a study of glasses of the type Cu_xAs₅₀Se_50-xfor x=5, 10 and 15 at.% Cu, by the method of thermomechanical analysis. Values of the thermal coefficients of linear expansion in solid (α_g) and visco-plastic (α_ω) phase were determined. On the basis of the results obtained using the mentioned methods it was possible to determine the specific temperature of the beginning of the softening process of the glass (T _g), as well as the temperature of the beginning of the deformation (T _ω). It was shown that coefficients of linear expansion decrease with the increase of Cu content. On the other hand, the increase of Cu content caused the increase of the temperatures. The analytical forms of dependence of four physical parameters α_g, α_ω, T _g, T _ωas a function of the Cu content were fitted.