Process for producing cobalt-and ferrous iron-containing ferroma

Details Process for producing cobalt-and ferrous iron-containing ferroma Process for producing cobalt-and ferrous iron-containing ferroma

1983-07-12

1985-11-05

Rutledge, L. Dewayne

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

252 6256, C01G 4906

Patent

active

045513279

ABSTRACT:
An aqueous slurry of a magnetic iron oxide powder is mixed with a suspension prepared by neutralizing an aqueous ferrous salt solution with an alkali to form ferrous hydroxide and then adding an aqueous cobalt salt solution thereto, and the excess OH concentration of the mixed slurry is adjusted to 0.05 to 3 mol/l, thereby obtaining a cobalt-and ferrous iron-containing ferromagnetic iron oxide. The cobalt-and ferrous iron-containing ferromagnetic iron oxide is excellent in coercivity, distribution of coercivity and other magnetic properties, and the magnetic tape produced by using such iron oxide is also excellent in coercivity and switching field distribution.

REFERENCES:
patent: 4066564 (1978-01-01), Sasazawa et al.
patent: 4066565 (1978-01-01), Sasazawa et al.
patent: 4224175 (1980-09-01), Montino et al.
patent: 4267207 (1981-05-01), Sasazawa et al.

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