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    • Keywords

       

      Free energy of mixing; cobalt-nickel alloys; cobalt oxide-nickel oxide solid solution; oxygen potential; solid state cell; thermodynamic properties; phase diagram; electromotive force

    • Abstract

       

      The tie-lines delineating equilibria between CoO-NiO and Co-Ni solid solutions in the ternary Co-Ni-O system at 1373 K have been determined by electron microprobe andedax point count analysis of the oxide phase equilibrated with the alloy. The oxygen potentials corresponding to the tie-line compositions have been measured using a solid oxide galvanic cell with calcia-stabilized zirconia electrolyte and Ni + NiO reference electrode. Activities in the metallic and oxide solid solution have been derived using a new Gibbs-Duhem integration technique. Both phases exhibit small positive deviations from ideality; the values ofGE/X1X2 are 2640 J mol−1 for the metallic phase and 2870 J mol−1 for the oxide solid solution.

    • Author Affiliations

       

      K T Jacob1 S Srikanth1 G N K Iyengar1

      1. Department of Metallurgy, Indian Institute of Science, Bangalore - 560 012, India
    • Dates

       
  • Bulletin of Materials Science | News

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