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 A, b = 21.01 A, c = 3.846 A, β = 96.2°). Compounds S1 and S4 crystallize in orthorhombic system (for S1, a = 16.76 A, b = 13.70 A, c = 3.88 A; for S4, a = 3.86 A, b = 11.64 A, c = 20.98 A, dexp = 4.62 g/cm3). Compound S2 crystallizes in cubic system (a = 10.68 A).
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