Preparation of finely divided barium ferrite of high coercivity

Details Preparation of finely divided barium ferrite of high coercivity Preparation of finely divided barium ferrite of high coercivity

1981-10-20

1983-08-30

Carter, Herbert T.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

C01G 4900

Patent

active

044016433

ABSTRACT:
A process for the preparation of barium ferrite of the formula BaFe.sub.12 O.sub.19 by reacting an aqueous solution or suspension of a barium salt and an aqueous solution of an iron(III) salt with an aqueous sodium carbonate solution, removing the solvent, heating the dry salt mixture to below the melting point of the sodium salt present, but to not less than 680.degree. C., and isolating the resulting finely divided, platelet-like barium ferrite from the barium ferrite/sodium salt mixture by leaching with water.

REFERENCES:
patent: 3113109 (1963-12-01), Brixner
patent: 3582266 (1971-06-01), Sopp et al.
patent: 3634254 (1972-01-01), Micheli
patent: 3793443 (1974-02-01), Arendt
patent: 3810973 (1974-05-01), Arendt et al.
patent: 4120807 (1978-10-01), Watanabe et al.
patent: 4289745 (1981-09-01), Patel
K. Haneda et al., J. of the Amer. Ceramic Soc. 57 (8), (1974), pp. 354-357.

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