Preparation of finely divided hexagonal ferrite powder

Details Preparation of finely divided hexagonal ferrite powder Preparation of finely divided hexagonal ferrite powder

1990-09-11

1991-09-24

Cooper, Jack

Compositions

Magnetic

Iron-oxygen compound containing

252 6263, 423594, C04B 3526

Patent

active

050512013

ABSTRACT:
Finely divided hexagonal ferrite powder is prepared by autoclave treatment of an aqueous alkaline suspension containing the ferrite-forming metal ions at from 250.degree. to 330.degree. C. and subsequent heating of the resulting material at not more than 900.degree. C., by a process in which the ferrite-forming metal ions are used in the form of salts melted in their water of crystallization.

REFERENCES:
patent: 3681010 (1972-08-01), Messier et al.
patent: 4548801 (1985-10-01), Nagai et al.
patent: 4671885 (1987-06-01), Gaud et al.

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