Abstract
The solid–liquid equilibria of the H2O–Co(NO3)2–Ni(NO3)2 ternary system were studied at 248.15K and 258.15K, using a synthetic method based on conductivity measurements. The obtained results were complemented by chemical and powder X-ray diffraction analyses. The solid phases are ice and two large substitutional solid solutions: Co(1−σ)Niσ(NO3)2·6H2O, which has a monoclinic structure, and Ni(1−ω)Coω(NO3)2·6H2O, which has a triclinic structure. The formation of a Ni(1−ε)Coε(NO3)2·9H2O solid solution is also highly probable.The ice liquidus curves were modelled in a truly remarkable way, using the quasi-ideal model taking into account ionic dissociation and solvation. The liquidus of the solid solutions were analysed without regard to cation solvation, as a first approximation. Linear behaviour was observed in all cases. On the basis of simple, representative equations, the experimental values were evaluated critically, refined and extrapolated.
Published Version
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