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The activity of CuO0.5 along the air isobars in the systems Cu-O-SiO2 and Cu-O-CaO at 1300 °C

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Abstract

The activities of Cu and CuO0.5 were measured in melts in the systems Cu-O, Cu-O-SiO2, and Cu-O-CaO at 1300 °C by establishing the equilibrium Cu(1) + l/4O2(g) = CuO0.5(l) between the melts, atmospheric air, and a small piece of platinum wire immersed in the melt. Chemical analysis of the equilibrium Pt-Cu alloy which was formed, with knowledge of the activity-composition relationship in the system Pt-Cu, allowed determination of the activity of copper in the melt. The activity of CuO0.5 along the air isobar in the system Cu-O-SiO2 decreases from unity to 0.64 at the solubility limit ofX SiO 2 = 0.13 and, in the system Cu-O-CaO, decreases to 0.7 at the solubility limit ofX CaO = 0.34. The activity of CuO0.5 is well represented by the regular solution model over the limited range of liquid composition in the system Cu-O-SiO2 and is reasonably well represented by the model in melts in the system Cu-O-CaO.

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Authors and Affiliations

  1. Intel Corporation, 85226, Chandler, AZ

    S. R. Peddada (Senior Analyst)

  2. Purdue University, 47907, West Lafayette, IN

    D. R. Gaskell (Professor of Metallurgical Engineering)

Authors
  1. S. R. Peddada
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  2. D. R. Gaskell
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Formerly Graduate Student, University of Illinois, Urbana-Champaign, IL

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Peddada, S.R., Gaskell, D.R. The activity of CuO0.5 along the air isobars in the systems Cu-O-SiO2 and Cu-O-CaO at 1300 °C. Metall Trans B 24, 59–62 (1993). https://doi.org/10.1007/BF02657872

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  • DOI: https://doi.org/10.1007/BF02657872

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