Method of preparing gamma ferric hydroxyoxide powder

Details Method of preparing gamma ferric hydroxyoxide powder Method of preparing gamma ferric hydroxyoxide powder

C - Chemistry, Metallurgy

01

G

23/267

C01G 1/02 (2006.01) C01G 45/02 (2006.01) C01G 49/06 (2006.01) G11B 5/706 (2006.01)

Patent

CA 1158837

ABSTRACT OF THE DISCLOSURE A method of preparing gamma ferric hydroxyoxide in which ferrous ions are reacted in an alkaline solution to produce a suspension of ferric hydroxide, the resulting suspension is treated with an oxidizing gas in a first oxidizing step at a relatively high oxidation rate, sufficient to cause nucleation of gamma ferric hydroxyoxide to occur, and then the oxidation rate is reduced in a second oxidizing step to cause crystal growth to occur on the nuclei formed in the first oxidizing step. The resulting product has magnetic and physical characteristics making it extremely suitable for use in the manufacture of magnetic recording media.

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