Using differential thermal, X-ray phase, microstructural analyzes and microhardness measurements, we studied the phase equilibrium in the Ga₂Se₃–CoSe system in the entire concentrated region and constructed its phase diagram. It has been established that the phase diagram refers to eutectic types with monotectics. The eutectic crystallizes at 1000⁰C and 10 mol% CoSe. Liquid phase delamination occurs in the concentration range from 15 to 85 mol% CoSe and 1030⁰C. There are no intermediate compounds formed in the system

doi.org/10.32737/0005-2531-2021-2-59-62