Phase relations and activities in the Co-Ni-O system at 1373 K

Jacob, K. T. ; Srikanth, S. ; Iyengar, G. N. K. (1986) Phase relations and activities in the Co-Ni-O system at 1373 K Bulletin of Materials Science, 8 (1). pp. 71-79. ISSN 0250-4707

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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.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
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
ID Code:94819
Deposited On:05 Oct 2012 10:06
Last Modified:19 May 2016 07:35

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