Interaction in the Yb₂S₃In₂S₃ System

N. R. Akhmedova, O. M. Aliev, and I. B. Bakhtiyarly

Institute of Chemical Problems, National Academy of Sciences of Azerbaijan,
pr. Javida 29, Baku, AZ1143 Azerbaijan

Received November 27, 2003

Abstract—A T–x diagram is designed for the Yb₂S₃–In₂S₃ system using physicochemical methods. A complex
chemical reaction occurs in the system to yield ternary compounds Yb₃InS₆ (S₁), YbInS₃ (S₂), Yb₃In₅S₁₂ (S₃),
and YbIn₃S₆ (S₄). In₂S₃-based limited solid solutions are found. Phases S₁ , S₃ , and S₄ are formed by peritectic
reactions at 1260, 1200, and 1100 K, respectively. Compound S₂ melts congruently at 1390 K. Compound S₃
crystallizes in monoclinic system (a = 10.90 Å, b = 21.01 Å, c = 3.846 Å, = 96.2°). Compounds S₁ and S₄
crystallize in orthorhombic system (for S₁ , a = 16.76 Å, b = 13.70 Å, c = 3.88 Å; for S₄ , a = 3.86 Å, b = 11.64Å,
c = 20.98 Å, d_exp = 4.62 g/cm³). Compound S₂ crystallizes in cubic system (a = 10.68 Å).

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