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A thermodynamic analysis of the copper-sulfur system

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Abstract

An associated solution model is applied to describe the thermodynamic behavior of Cu-S liquid. This model assumes the existence of ‘Cu2S’ species in addition to Cu and S in the liquid. With two solution parameters for each of the binaries Cu-‘Cu2S’ and ‘Cu2S’-S, this model accounts for the compositional dependence of the thermodynamic properties of Cu-S liquid from pure Cu to pure S over a wide range of temperature. The binary Cu-S does not contribute significantly to the excess Gibbs energy of the liquid due to the rather small dissociation constant of ‘Cu2S’ to Cu and S. Using this model for the liquid phase, a statistical thermodynamic model for the digenite phase, and appropriate thermodynamic equations for the other phases, the Cu-S phase diagram is calculated. The calculated diagram is in excellent agreement with the experimental data, accounting for the range of homogeneity of digenite at all temperatures.

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Authors and Affiliations

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

    R. C. Sharma (Lecturer)

  2. University of Wisconsin-Madison, Madison, WI

    Y. A. Chang (Professor of Metallurgical and Mineral Engineering)

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

Formerly with the Materials Department, University of Wisconsin-Milwaukee

Formerly Professor of Materials Engineering and Associate Dean for Research of the Graduate School of the University of Wisconsin-Milwaukee.

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Sharma, R.C., Chang, Y.A. A thermodynamic analysis of the copper-sulfur system. Metall Trans B 11, 575–583 (1980). https://doi.org/10.1007/BF02670137

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  • DOI: https://doi.org/10.1007/BF02670137

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