Using complex of physicochemical methods of analysis (DTA, XRD, MSA, as well as measurements of density and microhardness), the phase equilibria in the Sb₂S₃-Cr₂Se₃ system was studied and a phase diagram was constructed. It is established that the system is quasi-binary and has eutectic type T-x diagram. In the process of chemical interaction, a compound with composition Cr₂Sb₂S₃Se₃ is formed in the system. The Cr₂Sb₂S₃Se₃ compound melts incongruently at 650⁰C., A limited area of the solid solution based on the initial components of the system is formed. The coordinates of the eutectic formed between the α-solid solution and the Cr₂Sb₂S₃Se₃ compound is 17 mol % Cr₂Se₃ at 450⁰C. At room temperature, solid solutions based on Sb₂S₃ reach up to 5 mol % Cr₂Se₃, and based on Cr₂Se₃ up to – 3 mol % Sb₂S₃. According to the results of X-ray diffraction analysis, Cr₂Sb₂S₃Se₃ crystallizes in a tetragonal system with lattice parameters: a=16.37; c=11.69 Å, ρ_puc.=5.40 q/sm³, ρ_X-ray=5.42 q/sm³. The temperature dependence of the electrical conductivity and thermo-EMF of the (Sb₂S₃)_1-x(Cr₂Se₃)_x (x=0.01; 0.02; 0.03;) solid solution has been studied

doi.org/10.32737/0005-2531-2023-3-152-160