PHASE EQUILIBRIUM IN THE QUASI-TERNARY SYSTEM Y2O2S–Ga2S3–Tb2O2S

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The results of the study of quasibinary (lateral) and non-quasibinary polythermal sections in quadrilateral systems Y2O2S–Ga2S3–Tb2O2S show the prognosis of the established liquidity surface, where the nature of the chemical interaction is relatively simple. Thus, the Ga2S3–Y2O2S və Ga2S3–Tb2O2S sides of a quasi-triangular system are quasi-binary eutectic systems with a limited solubility based on both components. On the Y2O2S–Tb2O2S side, a continuous solid solution area is formed. Thus, in the Y2O2S–Ga2S3–Tb2O2S quasi-triangular system, crystallization ends not at the non-variant triple point, but at the low-temperature binary non-variant (eutectic e1).