Solid solutions of magnetic oxides and method of preparation

Details Solid solutions of magnetic oxides and method of preparation Solid solutions of magnetic oxides and method of preparation

1975-10-15

1978-06-20

Cooper, Jack

Compositions

Magnetic

Iron-oxygen compound containing

252 626, 252 6262, 252 6264, C04B 3526

Patent

active

040960803

ABSTRACT:
The invention concerns solid solutions of oxides of iron and of a divalent metal other than cobalt Co.sup.2+ or, alternatively, of iron and of more than one divalent metal, including cobalt. Besides Co, the divalent metals may be Ni, Cu, Mn, Zn, Mg and Cd. Such solutions are prepared by precipitating a mixed oxalate containing iron and the other divalent metal or metals desired. This mixed oxalate is decomposed by heating it in open air at a progressively increasing temperature until carbon is eliminated but without forming rhomboedric oxide .alpha.-Fe.sub.2 O.sub.3. The pyrolyzed product is treated by hydrogen and steam at an elevated temperature to obtain a substituted magnetite, and this magnetite is oxidized in air at such a temperature as to avoid formation of .alpha.-Fe.sub.2 O.sub.3.

REFERENCES:
patent: 2882236 (1959-04-01), Gorter et al.
patent: 3074888 (1963-01-01), Carter
patent: 3075919 (1963-01-01), Gruber et al.
patent: 3822210 (1974-07-01), Iwase et al.
patent: 3873461 (1975-03-01), Mollard et al.

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