Particle gamma ferric oxide

Details Particle gamma ferric oxide Particle gamma ferric oxide

1977-11-28

1979-11-27

Cooper, Jack

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

252 6256, C01G 4906

Patent

active

041761723

ABSTRACT:
Synthetic lepidocrocite (gamma ferric oxide monohydrate) having very fine-grained, needle-like crystalline particles, with at least about 70% of the particles having a length to width ratio of greater than 10:1, and a length of up to about 2 microns is made by first oxidizing a vigorously agitated alkaline-treated ferrous chloride solution until the pH is about 2.9-4.1 to form a synthetic lepidocrocite collodial seed slurry. The oxidation of the colloidal seed slurry is continued (optionally in the presence of metallic iron) at a temperature about 80.degree.-140.degree. F. and pH about 2.9-4.1 in the presence of excess ferrous chloride, until from about 1.2 to 5 parts by weight of total product is formed per part by weight of seed. A synthetic magnetic gamma ferric oxide may be made from the synthetic lepidocrocite by optionally coating the lepidocrocite particles with an organic surfactant, reducing, oxidizing and mechanically densifying the gamma ferric oxide particles. Magnetic impulse record members comprising a binding medium having therein the synthetic magnetic gamma ferric oxide are also disclosed.

REFERENCES:
patent: 2935379 (1960-05-01), Martin
patent: 3015627 (1962-01-01), Ayers et al.
patent: 3382174 (1968-05-01), Hund

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