Production of cobalt-doped ferrimagnetic iron oxides

Details Production of cobalt-doped ferrimagnetic iron oxides Production of cobalt-doped ferrimagnetic iron oxides

1980-01-10

1981-10-27

Cooper, Jack

Coating processes

Magnetic base or coating

252 6256, 252 6262, C01G 4902

Patent

active

042973953

ABSTRACT:
A cobalt-doped, acicular ferrimagnetic iron oxide having an FeO content of about 16 to 24%, by weight, and a cobalt content of about 0.7 to 2.4%, by weight, the coercive force amounting to at least about 425 Oe+175 Oe/%, by weight, of Co is produced by precipitating and oxidizing a cobalt-containing aqueous iron (ii) salt solution, reducing the precipitate to Fe.sub.3 O.sub.4, partially reoxidizing to adjust the FeO content and heat treating under inert conditions at a temperature from about 600.degree. to 800.degree. C.

REFERENCES:
patent: 3573980 (1971-04-01), Haller et al.
patent: 3748270 (1973-07-01), Hwang
patent: 3931025 (1976-01-01), Woditsch et al.
patent: 3953656 (1976-04-01), Tokuoka et al.
patent: 4015030 (1977-03-01), Sasazawa et al.
patent: 4052326 (1977-10-01), Schoenafinger et al.
patent: 4136049 (1979-01-01), Horiishi et al.

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