Abstract
The Cu2Se–Cu3AsSe4–Se system has been studied using differential thermal analysis, X-ray diffraction, and emf measurements on concentration cells using Cu4RbCl3I2 as a solid electrolyte. We have constructed a number of vertical sections through the phase diagram, the room-temperature solid-state phase compatibility diagram, and a projection of the liquidus surface. The primary crystallization fields of the phases present and the types and coordinates of in- and univariant equilibria in the system have been identified. The system has been shown to contain a broad liquid–liquid immiscibility region. Using emf data, we evaluated the standard thermodynamic functions of formation and standard entropy of the Cu3AsSe4 compound.
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Original Russian Text © L.F. Mashadieva, Z.T. Gasanova, Yu.A. Yusibov, M.B. Babanly, 2018, published in Neorganicheskie Materialy, 2018, Vol. 54, No. 1, pp. 11–18.
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Mashadieva, L.F., Gasanova, Z.T., Yusibov, Y.A. et al. Phase Equilibria in the Cu2Se–Cu3AsSe4–Se System and Thermodynamic Properties of Cu3AsSe4. Inorg Mater 54, 8–16 (2018). https://doi.org/10.1134/S0020168518010090
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DOI: https://doi.org/10.1134/S0020168518010090