PHYSICO-CHEMICAL INVESTIGATION OF PHASE EQUILIBRIUM IN NON-QUASI-BINARY e1-e2 SECTION OF QUASI-TERNARY SYSTEM PbGa2S4-Ga2S3-YbGa4S7

<p>Using physicochemical methods of analysis: differential-thermal analysis (DTA), X-ray diffraction (XRD), microstructure (MSA), determination of density and microhardness, the phase equilibrium in the section e1(PbGa2S4)0.60(Ga2S3)0.40- e2(YbGa2S4)0.85(Ga2S3)0.15 of the quasi-ternary system PbGa2S4-Ga2S3-YbGa4S7 was studied and the T-x phase diagram of the section was constructed. To determine the location of the ternary eutectic PbGa2S4-Ga2S3-YbGa4S7 in the quasi-ternary system, the section e1-e2 was studied. It was found that the section e1-e2 is a non-quasi-binary section of the quasi-ternary system PbGa2S4-Ga2S3-YbGa4S7. The projection of the liquidus surface of the quasi-ternary system PbGa2S4-Ga2S3-YbGa4S7 is constructed and the coordinates of its mono- and non-variant equilibrium are indicated.</p>