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Thermodynamics and phase relationships of transition metal-sulfur systems: Part III. Thermodynamic properties of the Fe-S liquid phase and the calculation of the Fe-S phase diagram

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Abstract

An associated solution model is applied to describe the thermodynamic behavior of Fe-S liquid. This model assumes the existence of ‘FeS’ species in addition to Fe and S in the liquid. With two solution parameters for each of the binaries Fe-‘FeS’ and ‘FeS’-S, this model accounts for the compositional dependence of the thermodynamic properties of Fe-S liquid from pure Fe to pure S over a wide range of temperature. The binary Fe-S does not contribute significantly to the excess Gibbs energy of the liquid due to the rather small dissociation constant of ‘FeS’ to Fe and S. Using this model for the liquid phase and a defect thermodynamic model for the pyrrhotite phase, the Fe-S phase diagram is calculated. The calculated diagram is in excellent agreement with the experimental data, accounting for the range of homogeneity of pyrrhotite at all temperatures. Both the thermodynamic and phase diagram data are obtained from the literature.

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Authors and Affiliations

  1. Department of Metallurgical Engineering, Indian Institute of Technology, Kanpur, India

    R. C. Sharma (Lecturer)

  2. Materials Department, College of Engineering and Applied Science, and Associate Dean of Research, Graduate School, University of Wisconsin-Milwaukee, 53201, Milwaukee, WI

    Y. A. Chang (Professor)

Authors
  1. R. C. Sharma
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  2. Y. A. Chang
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Additional information

Formerly Post-Doctoral Research Associate, Materials Department, College of Engineering and Applied Science, University of Wisconsin-Milwaukee.

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Sharma, R.C., Chang, Y.A. Thermodynamics and phase relationships of transition metal-sulfur systems: Part III. Thermodynamic properties of the Fe-S liquid phase and the calculation of the Fe-S phase diagram. Metall Trans B 10, 103–108 (1979). https://doi.org/10.1007/BF02653979

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  • DOI: https://doi.org/10.1007/BF02653979

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