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Melt crystallization of CuFe2S3 in the Cu–Fe–S system

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Abstract

The possibility of melt crystallization of the compound with CuFe2S3 composition was established by carrying out quasiequilibrium directional crystallization. The initial liquid had the following composition: Fe 33.3, Cu 16.7, and S 50.0 at.%. The produced sample consisted of three zones with different chemical compositions. The volume fraction of the first zone was 6 %, the second zone was 77 % and the third zone was 17 %. The composition of the first zone corresponded to pyrrhotite solid solution (poss). The second zone had the constant composition CuFe2S3. The third zone had variable composition. In the article this zone is not described. We constructed the curves describing the variations in the composition of solid ingot and melt during poss and CuFe2S3 crystallization, calculated the distribution coefficients of components, and determined the equation of phase reaction while transferring from the first to the second zone. A polythermal cross-section of phase diagram of the Cu–Fe–S system was built using the directional crystallization and thermal analysis of specially synthesized samples along the crystallization path. It is shown that stoichiometric CuFe2S3 compound crystallized from melt and the cross-section of phase diagram along the crystallization path is quasibinary. Thus, liquidus surface of the Fe–Cu–S system contains the region of primary crystallization of CuFe2S3, which is located between the crystallization fields of poss and intermediate solid solution.

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Acknowledgements

This study was supported partly by the Russian Foundation for Basic Research (Project No. 12-05-00099) and by the grant of Department of Earth Sciences No. 2.

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Authors and Affiliations

  1. Siberian Branch of the Russian Academy of Sciences, Nikolaev Institute of Inorganic Chemistry, pr. Lavrentieva, 3, Novosibirsk, 630090, Russia

    V. I. Kosyakov

  2. Siberian Branch of the Russian Academy of Sciences, Sobolev Institute of Geology and Mineralogy, pr. Koptyuga, 3, Novosibirsk, 630090, Russia

    E. F. Sinyakova

Authors
  1. V. I. Kosyakov
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  2. E. F. Sinyakova
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Correspondence to E. F. Sinyakova.

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Kosyakov, V.I., Sinyakova, E.F. Melt crystallization of CuFe2S3 in the Cu–Fe–S system. J Therm Anal Calorim 115, 511–516 (2014). https://doi.org/10.1007/s10973-013-3206-0

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  • DOI: https://doi.org/10.1007/s10973-013-3206-0

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