Manufacture of acicular cobalt-containing magnetic iron oxide

Details Manufacture of acicular cobalt-containing magnetic iron oxide Manufacture of acicular cobalt-containing magnetic iron oxide

1980-01-29

1981-10-20

Cooper, Jack

Coating processes

Magnetic base or coating

Magnetic coating

252 6256, 427127, C01G 4906

Patent

active

042961491

ABSTRACT:
A process for the manufacture of acicular magnetic iron oxide consisting of a core of gamma-iron(III) oxide and a ferrite shell which contains, based on the total amount of magnetic material, from 0.2 to 12 percent by weight of cobalt(II) ions and from 0.1 to 15 percent by weight of iron(II) ions, wherein a solution containing cobalt(II) hydroxide and iron(II) hydroxide is applied to acicular gamma-iron(III) oxide particles and the latter are heated at 100.degree.-220.degree. C.

REFERENCES:
patent: 3081264 (1963-03-01), Nobuoka et al.
patent: 3573980 (1971-04-01), Haller et al.
patent: 4188302 (1980-02-01), Becker et al.
Kishimoto et al. "J. Appl. Phys." 50(1), 1979 pp. 450-452.

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