The paper presents the results of an experimental study and analytical 3D visualization of phase equilibria in the AgSe–SiSe–SnSe (A) system. The T–x-diagram of the boundary system SiSe–SnSe, a number of polythermal sections, isothermal sections at 300, 800, 900 and 1000 K of the phase diagram, and a projection of the liquidus surface of the system (A) are constructed. It is established that the SiSe–SnSe boundary system is quasi-binary and belongs to the eutectic type. The system (A) is a quasi-ternary section of the concentration tetrahedron Ag–Si–Sn–Se. Its liquidus surface consists of four fields corresponding to the primary crystallization of phases based on SiSe, SnSe and HT–AgSe, as well as a continuous series of high-temperature solid solutions along the section AgSiSe–AgSnSe. In the subsolidus part of the system (A), phase transformations associated with the polymorphism of the compounds AgSe, AgSiSe, AgSnSe and solid solutions based on them are observed. Based on the phase diagrams of boundary quasi-binary systems and a limited number of DTA data for samples of the system (A), equations for calculating and 3D modeling the liquidus surfaces of the phases are obtained and their visualization is carried out.
S. R. Aslanli (Wed,) studied this question.