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

Jacob, K T and Srikanth, S and 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.

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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 ofG E/X 1 X 2 are 2640 J mol−1 for the metallic phase and 2870 J mol−1 for the oxide solid solution.

Item Type:Article
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Uncontrolled 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
Divisions:Director Office
ID Code:3976
Deposited By:Sahu A K
Deposited On:23 Sep 2011 10:24
Last Modified:30 Nov 2011 10:02
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