Manufacture of acicular ferrimagnetic iron oxides

Details Manufacture of acicular ferrimagnetic iron oxides Manufacture of acicular ferrimagnetic iron oxides

1979-01-25

1980-09-09

Cooper, Jack

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

252 6256, 423632, C01G 4906

Patent

active

042217768

ABSTRACT:
A process for the manufacture of acicular ferrimagnetic iron oxide by reducing heat-treated acicular iron(III) oxide hydroxide with an organic compound which decomposes in the presence of iron oxide at from 450.degree. to 650.degree. C., followed by at least partial oxidation with an oxygen-containing gas at from 200.degree. to 500.degree. C., wherein the iron(III) oxide hydroxide employed is heat-treated at from 450.degree. to 700.degree. C. and has a surface area, measured by the BET method, of from 10 to 23 m.sup.2 /g.

REFERENCES:
patent: 2900236 (1959-08-01), Speed et al.
patent: 3897354 (1975-07-01), Woditsch et al.
patent: 3904540 (1975-09-01), Bennetch et al.
patent: 4061725 (1977-12-01), Ohlinger et al.
Hamada et al., "Bull. of the Chem. Soc. of Japan", vol. 50(6), pp. 1635-1636, (1977).

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