Solubility products of nickel and cobalt oxides in molten NaCl (1100 K) and Na 2 SO 4 (1200 K) have been measured by coulometric titration of the respective chlorides ( NiCl 2 , CoCl 2 ) and sulfates ( NiSO 4 , CoSO 4 ) with electrochemically generated oxide ion, using a stabilized zirconia electrode as an oxide pump. The metal oxide equilibria were complicated by competitive paths leading to Na 2 O 2 , NaNiO 2 , and NaCoO 2 formation. Activity coefficients of soluble nickel and cobalt salts were also determined from a comparison of experimental data and thermodynamic calculations.
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Deanhardt et al. (1981) studied this question.