Abstract
The Tl2Te–TlBr–TlI system was investigated by means of the DTA and XRD analyses and microhardness and EMF measurements. Several polythermal and isothermal sections and the projection of the liquidus surface were constructed. The fields of primary crystallization, as well as types and coordinates of non- and monovariant equilibriums were determined. It was established that the system is characterized by formation of the continuous solid solution (γ-phase) between the Tl5Te2Br and Tl5Te2I (Tl5Te3 structure type) iso-structural compounds. The homogeneity field of γ-phase in the Tl5Te2Br–Tl5Te2I section penetrates the Tl2Te–Tl5Te2Br–Tl5Te2I subsystem and occupies its large part. The partial molar thermodynamic functions (ΔG¯,ΔH¯,ΔS¯) of thallium were calculated for the Tl5Te2BrxI1−x (for x=0.2; 0.4; 0.6; 0.8) solid solution based on the results of the EMF measurements.
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