Abstract
The phase relations in the 1.5GeS2+Cu2GeSe3↔1.5GeSe2+Cu2GeS3 system have been investigated over the entire concentration range mainly by thermal analysis (DTA), X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques, with the aid of microhardness and electro-motive force measurements (EMF) applied to equilibrated alloys. The liquidus surface projection, isothermal section at 800K and the phase diagrams of the two vertical sections have been constructed. The homogeneity ranges and primary crystallization fields of phases as well as the character and temperature of non- and monovariant equilibria were determined in the system. It was found that the system is reciprocally reversible and is featured by continuous solid solubility fields along the boundary GeS2–GeSe2 and Cu2GeS3–Cu2GeSе3 systems. The partial molar thermodynamic functions (ΔG‾,ΔH‾,ΔS‾) of copper were calculated for the Cu2GeS3−xSex (for x=0.6; 1.2; 1.8; 2.4) solid solutions based on the results of the EMF measurements.
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