Method for preparing cobalt-containing iron oxide magnetic parti

Details Method for preparing cobalt-containing iron oxide magnetic parti Method for preparing cobalt-containing iron oxide magnetic parti

1986-04-24

1988-05-03

Cooper, Jack

Coating processes

Magnetic base or coating

252 6256, 427128, C01G 4906

Patent

active

047419210

ABSTRACT:
Cobalt-containing iron oxide magnetic particles having a high coercive force and a small surface electrical resistance which are useful as a recording element for a magnetic recording medium, and a method for the preparation of the same comprising reducing acicular .gamma.-Fe.sub.2 O.sub.3 particles in a reducing gas or liquid until the iron oxide reaches an intermediate oxidation state between .gamma.-Fe.sub.2 O.sub.3 and Fe.sub.3 O.sub.4, dispersing the resulting iron oxide particles into an aqueous solution containing a cobalt salt and optionally a ferrous salt and an alkali of one equivalent or more to the metal salt(s), and heating the mixture at a temperature of higher than room temperature up to a boiling point of the mixture under an atmospheric condition such that the divalent iron is substantially not oxidized. The cobalt is thereby predominantly incorporated into the most outer layer of the acicular iron oxide particles.

REFERENCES:
patent: 3725126 (1973-04-01), Haller et al.
patent: 4002804 (1977-01-01), Akashi et al.
patent: 4015030 (1977-03-01), Sasazawa et al.

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