Akademik Məlumat İdarəetmə Sistemi
International Journal of Thermophysics, vol.46, no.10, 2025 (SCI-Expanded, Scopus)
The GeSb2Te4–Sb2Te3–Te system was investigated in the temperature range of 300–450 K using X-ray diffraction (XRD) and electromotive force (EMF) measurements on reversible galvanic cells of the type: (−) GeTe (solid) │ glycerol + KCl (electrolyte) │ Ge–Sb–Te (solid) (+). The results indicate that, within the studied temperature range, elemental tellurium establishes tie lines with all telluride phases present in the system. Based on the EMF measurement data, linear equations describing the temperature dependence of the electromotive force for electrode alloys corresponding to different phase regions of the system were established. These equations were used to calculate the partial thermodynamic functions of GeTe in the alloys. By combining the obtained data with the integral thermodynamic functions of GeTe, the partial molar functions of germanium in the alloys were calculated. Based on these data and the solid-phase equilibrium diagram of the GeSb2Te4–Sb2Te3–Te system, as well as corresponding thermodynamic functions of Sb2Te3, the standard Gibbs free energy of formation, enthalpy of formation, and standard entropy of GeSb2Te4, GeSb4Te7, GeSb6Te10, and Sb2Te3-based solid solutions were calculated.