Quasi-Binary Section CuInS2–FeIn2S4

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.