Akademik Məlumat İdarəetmə Sistemi
Chemical Thermodynamics and Thermal Analysis, vol.19, 2025 (Scopus)
The iron-gallium chalcogenides are promising materials for application in sustainable energy. This work aimed to investigate the solid-phase relations in the Fe-Ga-Se system in the FeSe-Ga2Se3-Se compositions area and the thermodynamic properties of ternary phases. Based on the experimental results and using literature data on boundary systems, the diagram of solid-phase equilibria of the above pointed composition range at room temperature was constructed. It was obtained that the solid solutions based on Ga2Se3 and FeGa2Se4 are in stable tie-lines with elemental selenium. For the thermodynamic study, the following reversible concentration cells (-) Fe(s.) | glycerol + KCl+FeCl2 | (Fe in alloy) (+) were assembled and their electromotive forces (EMF) were measured between 300–450 K temperature interval. The relative partial molar Gibbs energy, enthalpy, and entropy of iron in the alloys were calculated using the linear equations of the temperature dependences of the EMF in the various phase areas of the FeSe-Ga2Se3-Se system that were obtained from these EMF observations. The standard thermodynamic functions of formation and standard entropies of the FeGa2Se4 compound and (FeSe)1-х(Ga2Se3)х (x¯ = 0,55; 0,8; 0,9) solid solutions were computed from the given partial molar quantities using thermodynamic data for Ga2Se3 and the solid-phase equilibria diagram.