Effect of composition on the lattice parameters and thermal behaviour of nickel(II)–cobalt(II) hydroxide nitrate solid solutions

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Abstract
A series of coprecipitated nickel(II)–cobalt(II) hydroxide nitrate samples with different cationic compositions has been studied by means of X-ray diffraction, infrared spectroscopy and thermal analysis. A continuous series of solid solutions NixCo2–x(OH)3NO3(0⩽x⩽2) is formed between the end members Ni2(OH)3NO3 and Co2(OH)3NO3. The observed changes in the IR spectra have been interpreted in terms of increased polarization of the NO3 – group and increased strength of the hydrogen bonds when Ni2+ is gradually substituted for Co2+. The thermal stability of the solid solutions as well as the phase composition of the solid products of thermal decomposition depend upon the initial Ni : Co ratio in the samples.