Method for making beta cobaltous hydroxide

Details Method for making beta cobaltous hydroxide Method for making beta cobaltous hydroxide

1989-12-08

1991-10-15

Lewis, Michael L.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423138, 423140, C01G 5104

Patent

active

050572997

ABSTRACT:
Beta cobaltous hydroxide is synthesized by decomposing the complex formed between cobaltous ions and a suitable complexing agent under hydrothermal conditions. Cobaltous ion and complexing agent are combined in an aqueous medium, wherein the molar ratio of the cobaltous ion to the complexing agent is about one or more. Hydroxide ion is added, wherein the molar ratio of hydroxide ion to cobaltous ion is more than about 2. The resulting admixture is heated under hydrothermal conditions for precipitating beta cobaltous hydroxide. The method provides improved control over the size and shape of the beta cobaltous hydroxide reaction product. The beta cobaltous hydroxide can be reduced to form magnetic particles of cobalt metal.

REFERENCES:
patent: 2950172 (1960-08-01), Pincott et al.
Weiser et al, "The Transformation from Blue to Rose Cobaltous Hydroxide", 1932, from Journal of Physical Chemistry, vol. 36, pp. 722-734.
Basavalingu, "Formic Acid as a Fluid for Hydothermal Synthesis", 1983.
Masterton et al., Chemical Principles, 1977, pp. 54-56.
M. Body et al., Can. J. Chem, 1977, vol. 55, pp. 1770-1776.
R. S. Sapieszko et al., Corrosion-NACE, 1980, vol. 36, pp. 522-530.

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