Production of gamma iron oxide

Details Production of gamma iron oxide Production of gamma iron oxide

1973-11-02

1976-08-10

Vertiz, Oscar R.

Compositions

Magnetic

Iron-oxygen compound containing

423634, C01G 4906

Patent

active

039740790

ABSTRACT:
Process for producing ferromagnetic iron oxides whereby a solution of a ferrous salt is oxidized in the presence of .alpha.-FeO(OH) seed, a basic precipitant, and phosphoric acid or a water soluble salt thereof to form .alpha.-FeO(OH), which can be dehydrated, optionally tempered, reduced and re-oxidized to needle-shaped .gamma.-Fe.sub.2 O.sub.3. The resulting product has high coercive force values which make it especially useful for magnetic impulse recording and reproduction.

REFERENCES:
patent: 2694656 (1954-11-01), Camras
patent: 3382174 (1968-05-01), Hund
patent: 3652334 (1972-03-01), Abeck et al.

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