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The eutectic has the composition of 63 mol.% of EuS between EuS and EuLa2S4 and is melted at 2200 K. The compound EuLa2S4 is congruently melted at 2360 K and forms eutectic with initial components. The authors have determined that the singular compound with the composition of EuLa2S4 was formed in the system EuS-La2S3. The work has indicated that the formation of two congruently melting ternary compounds was observed in the system: EuGa2S4, EuGa4S7 melting at 14 K, respectively. In the system there are two eutectic points, with coordinates, corresponding to 20 mol.% of La2S3 at 1140 K and 80 mol.% of La2S3 at 1395 K.Īccording to data, the system EuS-Ga2S3 is quazibinary with singular congruently melting compound EuGaS4. The sides of the above-mentioned ternary system La2S3-Ga2S3 are quazibinary a congruently melting compound La6Ga10/3S14 is formed at 1425 K, but by peritectic reaction (L+La6Ga10/3S14 o- LaGaS3) forming LaGaS3 takes place at 1225 K. Therefore, knowledge about the character of physicochemical interaction in the ternary system La2S3-Ga2S3-EuS opens up possibilities for synthesis of new materials with predicted properties. activated EuGa2S4:Ln3+, which have Anti-Stokes luminescent properties, native to good results reproducibility, wide operating region of optical transparency. Of primary concern among a wide variety are compound chalcogenide lanthanides, i.e. The optical transparency of a great number of crystalline materials in the visible regions and IR spectrum may serve as the basis for their application. Keywords: system, physico-chemical research, phase diagram, glassformation, non- and monovariant equilibria. The regions of primary crystallization of all phases as well as coordinates of all non- and mono-variant equilibria were established in the studied. The phase diagrams of some polymeric cuts and projections of liquidus surface were plotted. M.Nagiyev Institute of Catalysis and Inorganic Chemistry, NAS of Received īy the methods of differential thermal, X-ray phase, microstructural analyses and microhardness and alloy density testing, phase equilibria in a ternary system La2S3-Ga2S3-EuS have been investigated. I.B.Bakhtiyarly, A.S.Abdullayeva, R.D.Kurbanova, R.I.Karimov THE TERNARY SYSTEM La2S3-Ga2S3-EuS AND GLASS FORMATION