Abstract

The Fe0.45S0.55-Ni0.66S0.34 section of the Fe-Ni-S phase diagram was constructed using thermal analysis, microscopy, X-ray powder diffraction, and electron probe microanalysis data obtained for the samples prepared by isothermal annealing and thermal analysis and by directional solidification of Fe0.2665Ni0.2665S0.467 melt under quasi-equilibrium conditions. Four invariant phase reactions are found in this section. The solid-phase mechanism of pentlandite formation is verified.

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