Manufacture of acicular ferrimagnetic iron oxide

Details Manufacture of acicular ferrimagnetic iron oxide Manufacture of acicular ferrimagnetic iron oxide

1982-12-10

1984-08-07

Cooper, Jack

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

252 6256, C01G 4906

Patent

active

044643527

ABSTRACT:
A process for the manufacture of acicular ferrimagnetic iron oxide by converting acicular iron(III) oxide hydroxide at from 300.degree. to 650.degree. C., by treatment with an organic compound which decomposes in this temperature range in the presence of iron oxide, the iron(III) oxide hydroxide used for the reaction being a lepidocrocite which has been heat-treated at from 300.degree. to 700.degree. C.

REFERENCES:
patent: 2900236 (1959-08-01), Speed et al.
patent: 3498748 (1970-03-01), Greiner
patent: 3897354 (1975-07-01), Woditsch et al.
patent: 3904540 (1975-09-01), Bennetch et al.
patent: 4108787 (1978-08-01), Masaki et al.
Hamada et al., "Bull. of the Chem. Soc. of Japan", vol. 50, (6), pp. 1635-1636, (1977).

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