Aliyev I.
Doctor of Chemistry, prof. hands. lab.
Rahimova V.
Ph.D., Associate Prof.,
Ismailova S.
Researcher.
Huseynova Sh.
Ph.D. chemical sciences
Institute of Catalysis and Inorganic Chemistry named after M.F.Nagiyev,
Ministry of Science and Education of the Republic of Azerbaijan
Iskendarova G.
Ph.D. chemical sciences
Institute of Physics, Ministry of Science and
Education of the Republic of Azerbaijan

Abstract
The phase equilibrium in the Cu₃As₄Te₉-CrAsTe₃ system was studied by methods of physicochemical analysis: differential thermal analysis (DTA), X-ray diffraction analysis (XRD), microstructural analysis (MSA), determination of density and microhardness, and a T-x phase diagram of the system was constructed. As a result, it was established that the phase diagram of the Cu₃As₄Te₉-CrAsTe₃ system is a non-quasi-binary section of the quasi-ternary Cr₂Te₃-As₂Te₃-CuTe system. In the system at room temperature, solid solutions based on the Cu₃As₄Te₉ compound extends to 5 mol % CrAsTe₃. The peritectic compound CrAsTe₃ decomposes as follows: CrAsTe↔M+Cr₂Te₃.

 Keywords: system, phase equilibrium, non-quasi-binary, diagram, density.