Process for producing cobalt-modified ferromagnetic iron oxide

Details Process for producing cobalt-modified ferromagnetic iron oxide Process for producing cobalt-modified ferromagnetic iron oxide

1984-06-28

1986-04-08

Cooper, Jack

Coating processes

Magnetic base or coating

252 6256, 427129, H01F 111, C01G 4906

Patent

active

045812519

ABSTRACT:
A process for preparing cobalt-modified ferromagnetic iron oxide by modifying ferromagnetic .gamma.-Fe.sub.2 O.sub.3 particles with cobalt, wherein prior to cobalt modification treatment, the ferromagnetic .gamma.-Fe.sub.2 O.sub.3 is heat treated at a temperature in the range of from about -200.degree. C. to +30.degree. C. of the critical temperature at which partial transition of .gamma.-Fe.sub.2 O.sub.3 into .alpha.-Fe.sub.2 O.sub.3 occurs and which reduces the saturation magnetization to 99% of the saturation magnetization measured before the heat treatment, and the atomic ratio of Fe.sup.++ /Fe.sup.+++ after the cobalt modification is 0.00 to 0.10.

REFERENCES:
patent: 4064292 (1977-12-01), Schoenafinger et al.
patent: 4212903 (1980-07-01), Schnell et al.

Affiliated with

Also associated with

Rating

Process for producing cobalt-modified ferromagnetic iron oxide does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for producing cobalt-modified ferromagnetic iron oxide, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for producing cobalt-modified ferromagnetic iron oxide will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2065395