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Thermodynamic optimization of the Co-Zn system

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Abstract

Literature information and authors’ experimental data have been used for the evaluation of optimized polynomial coefficients serving to calculate the cobalt (Co)-zinc (Zn) phase diagram. The programs BINGSS and THERMO-CALC have been used for the optimization. The binary liquid phase, the solid Co-based face-centered-cubic (fcc) and hexagonal close-packed solutions, as well as the intermediate β-, β1-, and γ-compounds have been treated as disordered substitutional phases. The phases with narrow homogeneity ranges (δ, γ1, and γ2) have been modeled as stoichimetric Co2Zn15, CoZn7, and CoZn15, respectively. The calculated phase diagram and thermodynamic quantities are in agreement with the experimental data. For the first time, a eutectoid decomposition (at around 658 K) of the fcc solutions has been predicted. Moreover, the calculations have shown the possibility for a magnetically induced miscibility gap involving both forms (paramagnetic and ferromagnetic) of the fcc solutions.

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Authors and Affiliations

  1. Faculty of Chemistry, University of Sofia, 1 J. Bourchier Avenue, 1164, Sofia, Bulgaria

    George Penev Vassiley

  2. Department of Materials Science, Graduate School of Engineering, Tohoku University, 980-8579, Sendai, Japan

    Min Jiang

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  1. George Penev Vassiley
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  2. Min Jiang
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Vassiley, G.P., Jiang, M. Thermodynamic optimization of the Co-Zn system. J Phs Eqil and Diff 25, 259–268 (2004). https://doi.org/10.1007/s11669-004-0115-8

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  • DOI: https://doi.org/10.1007/s11669-004-0115-8

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