Process for producing cobalt- and iron-containing ferromagnetic

Details Process for producing cobalt- and iron-containing ferromagnetic Process for producing cobalt- and iron-containing ferromagnetic

1976-07-02

1978-01-03

Cooper, Jack

Compositions

Magnetic

Iron-oxygen compound containing

427127, 427128, 427130, C01G 4906, C01G 4908

Patent

active

040665640

ABSTRACT:
A Co- and Fe-containing ferromagnetic iron oxide powder having a high coercive force and improved stability to heat and pressure is produced by adding an aqueous alkali solution, an aqueous solution containing Co.sup.+2 ions, and an aqueous solution containing not more than 1 equivalent, based on the Co.sup.+2 ions, of Fe ions to a suspension of ferromagnetic iron oxide, and heating the mixture at a temperature of at least 80.degree. C in the presence of an oxidizing agent. The ferromagnetic iron oxide powder is especially suitable for producing magnetic recording media.

REFERENCES:
patent: 3075919 (1963-01-01), Gruber et al.
patent: 3243375 (1966-03-01), Jeschke
Umeki, "Chem. Abstracts," vol. 82, 1975, 79751v.

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