Preparation of cobalt-containing, acicular, magnetic iron oxides

Details Preparation of cobalt-containing, acicular, magnetic iron oxides Preparation of cobalt-containing, acicular, magnetic iron oxides

1987-05-04

1988-09-13

Pianalto, Bernard D.

Coating processes

Magnetic base or coating

Magnetic coating

427127, B05D 512

Patent

active

047709030

ABSTRACT:
Acicular, magnetic iron oxide consisting of a core of gamma-iron(III) oxide and a ferrite shell containing a total of from 0.4 to 12% by weight of cobalt(II) ions and from 0.1 to 15% by weight of iron(II) ions, the percentages being based on the total amount of magnetic material, is prepared by a process in which an iron(II) hydroxide precipitate is applied to the gamma-iron(III) oxide core in a first stage and an iron-(II)/cobalt hydroxide precipitate is applied to the said core in a second stage, and the core is then converted to the ferrite shell by oxidation.

REFERENCES:
patent: 3573980 (1971-04-01), Haller et al.
patent: 4122216 (1978-10-01), Okazoe et al.
patent: 4267207 (1981-05-01), Sasazawa et al.
M. Kishimoto et al., Journal of Magnetism & Magnetic Materials 31-34, (1983), 943-944.

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