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Determination of the Eutectic to Peritectic Fold Transition in the Cu(Ni)–Fe–S System by Directional Crystallization of Melts

  • PHYSICOCHEMICAL ANALYSIS OF INORGANIC SYSTEMS
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Abstract

This paper is concerned with theoretical analysis of the quasi-equilibrium directional crystallization of three-component melts. How the phase composition changes at each site of the sample and how the phase compositions change for various types of phase reactions are considered. It is shown that the eutectic reaction can change to a peritectic reaction as temperature lowers during directional crystallization. A 29.96 Fe + 21.55 Cu + 2.01 Ni + 46.49 S (at %) melt was directionally crystallized. Since nickel is present in the ingot in the form of impurities dissolved in the phases of the Cu–Fe–S system, the behavior of the melt belonging to this three-component system could be involved in data interpretation. As a result, a sample has been obtained with three zones changing one another: single-phase FezS1 ± δ (Poss), a Poss + (Cu,Fe)1 + xS (Iss) two-phase eutectic mixture, and then single-phase Iss. The average composition of the solid phase changes from one discrete value to another in going to the next zone, while the melt and solid solutions in the neighboring zones have their compositions changing continuously. These results are consistent with theoretical ideas.

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Notes

  1. Such a reaction is frequently referred to as a cotectic reaction [29].

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ACKNOWLEDGMENTS

The authors are deeply grateful to Viktor I. Kosyakov, who passed away untimely, for his invaluable contribution to the development of the theory of specific features of complex systems and for providing an option for the experimental verification of this theory.

The authors are also grateful to E. N. Nigmatulina, the analyst at the Shared Facilities Center for Multielement and Isotopic Studies at the Siberian Branch of the Russian Academy of Sciences, for help in conducting phase microanalysis.

Funding

The work was supported by the Ministry of Science and Higher Education of the Russian Federation as part of Government Assignment No. 122041400237-8 to the Sobolev Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences, and part of Government Assignment No. 122041400031-2 to the Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences.

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Authors and Affiliations

  1. Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia

    E. F. Sinyakova

  2. Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia

    I. G. Vasilyeva

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  1. E. F. Sinyakova
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  2. I. G. Vasilyeva
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Correspondence to E. F. Sinyakova.

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Translated by O. Fedorova

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Sinyakova, E.F., Vasilyeva, I.G. Determination of the Eutectic to Peritectic Fold Transition in the Cu(Ni)–Fe–S System by Directional Crystallization of Melts. Russ. J. Inorg. Chem. (2024). https://doi.org/10.1134/S0036023623602660

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