Abstract
Cadmium hydroxide dissolves homogeneously in α-nickel hydroxide to 28 mol-% in β-nickel hydroxide to 10 mol-%. When treated in potassium hydroxide solution α-cadmium-nickel hydroxide changes to β-cadmium-nickel hydroxide, as in the case of pure α-nickel hydroxide. If the amount of cadmium ions in α-cadmium-nickel hydroxide is higher than the solubility of cadmium ions in β-nickel hydroxide, in the course of the conversion process the excess of cadmium ions is set free as β-cadmium hydroxide beside the β-nickel hydroxide. Electrochemical experiments carried out at sintered plates and at bulk electrodes show β-nickel hydroxide to contain an electrochemically inactive amount of cadmium hydroxide, about 10 mol-% dissolved homogeneously in β-nickel hydroxide.
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