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A thermodynamic analysis of the Cu-O system with an associated solution model

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Abstract

An extension of the associated solution model is developed and applied to the Cu-O liquid phase. Associated species “Cu2O” in the liquid solution are assumed, which interact with the surrounding free Cu and O atoms. All thermodynamic properties and the phase diagram calculated from this model are in good agreement with the experimental information. The success of this mathematical description is, of course, no proof for the physical existence of associated species. A consistent set of thermodynamic data of the various solid, liquid, and gaseous phases is given by this comprehensive evaluation. In addition, linear approximations for the Gibbs energies of reaction of formation and the interaction coefficients are offered. A metastable liquidus of the compound CuO at elevated pressure is predicted, the congruent melting point being 1228 °C at δC atP O 2 = 24.4 atm (2.47 MPa).

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Authors and Affiliations

  1. Institut fur Eisenhuttenkunde und Giessereiwesen, Technical University Clausthal, D-3392, Clausthal-Zellerfeld, Germany

    Rainer Schmid (Privatdozent, Visiting Associate Professor)

  2. Department of Metallurgical and Mineral Engineering, University of Wisconsin-Madison, 53706, Madison, WI

    Rainer Schmid (Privatdozent, Visiting Associate Professor)

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  1. Rainer Schmid
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Schmid, R. A thermodynamic analysis of the Cu-O system with an associated solution model. Metall Trans B 14, 473–481 (1983). https://doi.org/10.1007/BF02654367

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