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Activity-composition relations at 1100°C in the system calcium oxide-iron oxide-manganese oxide in contact with metallic iron

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Abstract

The extent of the solid miscibility gap in the system CaO−“FeO”−MnO at 1100°C has been determined termined by electron microprobe, point-counting, and X-ray diffraction analysis of coexisting phases within the miscibility gap. Activities of FeO in ternary solid solutions have been determined at 1100°C by equilibrating the solid solutions with metallic iron and a gas phase of known oxygen pressures. Activity-composition curves for CaO and MnO in the ternary system are calculated from a Gibbs-Duhem integration, and the data are extrapolated to the binary system CaO−MnO, which is shown to display a considerable positive deviation from ideality at 1100°C.

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Author notes

  1. Nils Tiberg (Research Engineer)

    Present address: , Oxelösunds Järnverk, Sweden

Authors and Affiliations

  1. Department of Geochemistry and Mineralogy, The Pennsylvania State University, Pennsylvania, USA

    Arnulf Muan (Professor of Mineral Science and Head)

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  1. Nils Tiberg
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  2. Arnulf Muan
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NILS TIBERG, formerly Graduate Assistant, Department of metallurgy, The Pennsylvania State Univeristy, University Park, Pa.

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Tiberg, N., Muan, A. Activity-composition relations at 1100°C in the system calcium oxide-iron oxide-manganese oxide in contact with metallic iron. Metall Trans 1, 435–439 (1970). https://doi.org/10.1007/BF02811553

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  • DOI: https://doi.org/10.1007/BF02811553

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