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Investigation of the surface of the liquidus of the Fe-Ni-S system at X s<0.51

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Abstract

Methods of thermal analysis, X-ray, optical, and electron microscopy were used to study the liquidus surface of the Fe-Ni-S system in the field of 35 to 51 at. pct sulfur. The FeS-NiS, FeS-Ni3S2, Fe0.55S0.45-Ni0.55S0.45, and Fe0.61S0.39-Ni0.61S0.39 sections and some additional samples were examined. A microscopic study of the samples slowly cooled and annealed enabled referring of all the samples to the fields of primary crystallization of the monosulfide solid solution (Fe x Ni1−x )S1+y (MSS), the Fe-Ni solid solution with the γ-Fe structure (TN), and the (Fe x Ni1−x )3±y S2 heazlewoodite solid solution (HZSS). The data, obtained by a method of derivative thermal analysis, have been used to describe analytically the MSS and HZSS surface of primary crystallization. Previous results were used together with our own data to construct the TN surface of primary crystallization. These parts of the liquidus surface have been approximated by polynomial equations, the coefficients of which were determined by the least-squares method. As a result of the absence of experimental data in the δ-Fe-based solid-solution primary crystallization field, this liquidus part is approximated on the basis of the Fe-S and Ni-Fe phase diagram data. The equations are used to construct the boundaries between various areas of phase primary crystallization, to define the coordinates of a triple point, and to construct isotherms.

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Authors and Affiliations

  1. Laboratory of Experimental Modelling of Ore-forming Process, Institute of Mineralogy and Petrography, the Russian Academy of Science (SB RAS), Novosibirsk 90, 630090, Russia

    E. F. Sinyakova (Senior Scientist)

  2. Laboratory of the Inorganic Material Thermodynamics, Institute of Inorganic Chemistry, the Russian Academy of Science (SB RAS), Novosibirsk 90, 630090, Russia

    V. I. Kosyakov (Leading Scientist) & V. A. Shestakov (Senior Scientist)

Authors
  1. E. F. Sinyakova
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  2. V. I. Kosyakov
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  3. V. A. Shestakov
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Sinyakova, E.F., Kosyakov, V.I. & Shestakov, V.A. Investigation of the surface of the liquidus of the Fe-Ni-S system at X s<0.51. Metall Mater Trans B 30, 715–722 (1999). https://doi.org/10.1007/s11663-999-0033-6

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  • DOI: https://doi.org/10.1007/s11663-999-0033-6

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