High coercivity, cobalt-doped ferrimagnetic iron oxide particula

Details High coercivity, cobalt-doped ferrimagnetic iron oxide particula High coercivity, cobalt-doped ferrimagnetic iron oxide particula

1981-04-07

1983-02-01

Cooper, Jack

Coating processes

Magnetic base or coating

Magnetic coating

427127, 427213, 252 6256, C01G 4902

Patent

active

043715672

ABSTRACT:
Highly coercive, cobalt-doped ferrimagnetic iron oxide particulates comprised of ferrous iron and well-adapted for the manufacture of various magnetic recording media, are prepared by (i) thermally decomposing a .beta.-diketone/cobalt complex onto fluidized iron oxide particles having the formula (FeO).sub.x Fe.sub.2 O.sub.3, wherein 0.ltoreq.x.ltoreq.1.5, (ii) next annealing the particulates which result at a temperature ranging from about 300.degree. to 500.degree. and then (iii) permitting the same to cool, while at the same time sweeping the cooling zone with an inert gas, and then (iv) controlledly re-oxidizing the annealed/cooled particles.

REFERENCES:
patent: 4224175 (1980-09-01), Montino et al.
patent: 4267207 (1981-05-01), Sasazawa et al.
patent: 4296149 (1981-10-01), Rudolf et al.

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