Preparation of acicular, ferrimagnetic iron oxides

Details Preparation of acicular, ferrimagnetic iron oxides Preparation of acicular, ferrimagnetic iron oxides

1982-10-20

1984-05-15

Cooper, Jack

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

252 6256, 423634, C01G 4908

Patent

active

044487614

ABSTRACT:
Acicular ferrimagnetic iron oxides are prepared by a process in which iron (III) oxide hydroxide consisting essentially of lepidocrocite is reduced at from 350.degree. to 600.degree. C. by means of an organic compound which is a synthetic polymer with a molecular weight of from 3,000 to 40,000 to give magnetite, which, if desired, is subsequently partially or completely oxidized with an oxygen-containing gas at from 200.degree. to 450.degree. C.

REFERENCES:
patent: 3399142 (1968-08-01), Conley
patent: 3498748 (1970-03-01), Greiner
patent: 3904540 (1975-09-01), Bennetch et al.
patent: 4176172 (1979-11-01), Bennetch et al.
patent: 4213959 (1980-07-01), Brodt et al.

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