Phase Formation and Solubilities in the Ternary System Ni(OH)2-NiCl2-H2O at 25 
and 200°C

Bette, S.; Pannach, M.; Dinnebier, R. E.; Freyer, D.

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Phase Formation and Solubilities in the Ternary System Ni(OH)₂-NiCl₂-H₂O at 25 and 200°C

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Dinnebier, R. E.
Scientific Facility X-Ray Diffraction (Robert E. Dinnebier), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Bette, S., Pannach, M., Dinnebier, R. E., & Freyer, D. (2017). Phase Formation and Solubilities in the Ternary System Ni(OH)₂-NiCl₂-H₂O at 25 and 200°C. European Journal of Inorganic Chemistry, 2017(11), 1488-1497.

Cite as: https://hdl.handle.net/21.11116/0000-000E-D09C-7

Abstract

The solid/liquid equilibria in the ternary system Ni(OH)(2)-NiCl2-H2O at temperatures of 25 and 200 degrees C have been investigated by applying equilibration periods of up to 45 months (3 years and 9 months). The equilibration process was studied by isothermal saturation methods using different solids as starting materials. At 200 degrees C, Ni2Cl(OH)(3) and NiCl(OH) occur as stable phases, whereas a solid solution, NiClx(OH)(2-x) (ss-type-OH), appears as an intermediate phase. At 25 degrees C, two nickel(II) chloride hydroxide hydrates, Ni3Cl2+x(OH)(4-x)center dot 4H(2)O and Ni3Cl(OH)(5)center dot 4H(2)O, are formed. The latter phase was characterized for the first time and a structural model was created from a Rietveld refinement of the powder X-ray diffraction pattern. A systematic investigation of the solubilities at 25 degrees C revealed that Ni2Cl(OH)(3) is the solid phase in both dilute and concentrated NiCl2 solutions at this temperature. In general, all stable and metastable phases in the system Ni(OH)(2)-NiCl2-H2O exhibit very low solubility, but during the very slow phase transformations high hydroxide supersaturations occur that are persistent for years.