Study was given to a fragment of the phase diagram of the system Fe–FeS–NiS–Ni at 900 °C in the field of the monosulfide solid solution (mss) + sulfide melt (L) equilibrium and in its vicinity. The samples after isothermal annealing and quenching were studied by microscopy and X-ray diffraction and electron microprobe analyses. Tie lines in the L + mss field and the position of the boundary of this field have been determined. Also, the sides of the triangle L + mss + taenite has been refined, and the dependences of the mss–melt partition coefficients of all components on the melt composition have been established. Using the pyrrhotite method, sulfur fugacity fS2 was measured along the sections with 51, 48, and 45 at.% S and the FeS–Ni3S2 section at 900 °C.

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