Abstract
By physicochemical analysis methods, the phase equilibrium in the CuInS2–FeIn2S4 system was studied, and its phase diagram was constructed. It was shown that the CuInS2–FeIn2S4 system is quasi-binary. In this system, the compound CuFeIn3S6 forms, which melts congruently at 1365 K and crystallizes in the orthorhombic system with the unit cell parameters a = 11.236 A, b = 11.457 A, c = 4.015 A, and Vcell = 516.854 A3 and the space group Pnma. The coordinates of eutectics are (31 mol % FeIn2S4, 1285 K) and (68 mol % FeIn2S4, 1315 K). At 300 K, CuInS2- and FeIn2S4-based solid solution regions were found at 12 mol % FeIn2S4 and 3 mol % CuInS2, respectively, and at 1000 K, the solubility regions extend to 15 mol % FeIn2S4 and 5 mol % CuInS2, respectively.
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