System state diagram FeS-Pb₆In₁₀S₂₁. Preparation and some properties of the quaternary compound Fe₃Pb_nIn₂₀S₄₄

It is known that multicomponent sulfide compounds especially containing magnetic (FeGa₂S₄, Fe₂Ga₂S₅, FeIn₂S₄, etc.) ions are functional materials and are used in the manufacture of magneto-optical devices. The synthesized alloys were studied by methods of physicochemical analysis, differential thermal analysis (DTA) (NTR-73 thermal analyzer chromel-alumel thermocouple, heating rate 70 / min, calcined Al₂O₃ served as a reference). X-ray diffraction analysis was carried out on a Bruker D2 PHASER X-ray diffractometer (CuKa radiation, Ni filter); MSA- was performed on a MIM-7 microscope, and microhardness was determined on a PMT-3 microhardness tester. Using the methods of physicochemical analysis, the phase equilibria in the FeS-Pb₆Jn₁₀S₂₁ system were studied and its state diagram was constructed first time. It has been established that the system is a quasibinary section of the quasiternal system FeS-In₂S₃-PbS and is characterized by the formation of a quaternary compound of the composition Fe₃Pb_nIn_2CS₄₄ (Fei₅Pb₅₅Jn_1CS₂₂). The Fe₃Pb₁₁In₂₀S₄₄ compound melts congruently at 1150 K and is a phase of variable composition. The solubility based on troilite modification (FeS) at 300K is 1.0 mol%, based on the quasiternal compound, the solubility covers 35 to 46 mol% of Pbfn₁₀S₂₁ and the solubility based on Pb₆In₁₀S₂₁ is 10 mol% FeS. It was found that the compound Fe₃Pb₁₁In₂₀S₄₄ with the initial sulfides forms a eutectic equilibrium.

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