Process for the preparation of magnetic powders based on .gamma.

Details Process for the preparation of magnetic powders based on .gamma. Process for the preparation of magnetic powders based on .gamma.

1979-04-13

1980-09-23

Cooper, Jack

Compositions

Magnetic

Iron-oxygen compound containing

427127, 427215, C01G 4906

Patent

active

042241758

ABSTRACT:
A process is disclosed for obtaining acicular magnetic particles of .gamma.-Fe.sub.2 O.sub.3 modified with Fe.sup.++ and Co.sup.++ ions. The product thus obtained and magnetic tapes containing said product are also disclosed. A suspension of acicular .gamma.-Fe.sub.2 O.sub.3 in an aqueous solution of soluble Fe.sup.++ and Co.sup.++ salts is prepared. NH.sub.3 is then added in such quantity that the molar ratio

REFERENCES:
patent: 3725126 (1973-04-01), Haller et al.
patent: 3748270 (1973-07-01), Hwang
patent: 4066564 (1978-01-01), Sasazawa et al.
patent: 4069164 (1978-01-01), Dezawa et al.
patent: 4122216 (1978-10-01), Okazoe

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