Solubility of Nickel and Cobalt Oxides in High-Temperature Water

Kostadin Dinov; Chihiro Matsuura; Daisuke Hiroishi; Kenkichi Ishigure

doi:dx.doi.org/10.13182/NSE92-36

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Solubility of Nickel and Cobalt Oxides in High-Temperature Water

Kostadin Dinov, Chihiro Matsuura, Daisuke Hiroishi, Kenkichi Ishigure

Nuclear Science and Engineering / Volume 113 / Number 3 / March 1993 / Pages 207-216

Technical Paper / dx.doi.org/10.13182/NSE92-36

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The solubility of NiO and CoO in high-temperature water is measured at temperatures between 373 and 523 K in a special batch autoclave system. Great importance has been given to deriving reliable thermodynamical data for the related ionic species at elevated temperatures. The experimental results for NiO seem to be consistent with the previously proposed free-energy data set for Ni²⁺. Because of the lack of experimental information on the free energy of formation (ΔG°_f) for Co²⁺, the Criss-Cobble approach is used to calculate the values. The estimates are compared with the experimental results. It is concluded that the application of the Criss-Cobble procedure to Co²⁺ ions is not correct above 423 K. Based on the experiments, a new set of ΔG°_f values for Co²⁺ is proposed.