Process for the preparation of sulfur modified ferromagnetic chr

Details Process for the preparation of sulfur modified ferromagnetic chr Process for the preparation of sulfur modified ferromagnetic chr

1973-08-31

1976-05-04

Cooper, Jack

Compositions

Magnetic

Chromium or chromium compound containing

C01G 3702

Patent

active

039546411

ABSTRACT:
The present invention provides a ferromagnetic chromium oxide powder having an additive of sulfur incorporated therewith, which powder has a lower curie temperature than that of pure chromium dioxide powder and a high saturation magnetization. Said powder has a composition in weight percent, consisting essentially of 61.90 to 57.22 percent of chromium and 0.0038 to 15.10 percent of sulfur. Moreover, the ferromagnetic chromium oxide powder having a combination of sulfur and further additives selected from tellurium, tin and antimony has a lower Curie temperature than that of pure chromium dioxide together with a high intrinsic coercive force and a high saturation magnetization. The particles of these powders are in a uniform acicular shape and are useful in magnetic recording media, especially for slave tapes in thermo-magnetic duplication.

REFERENCES:
patent: 2923683 (1960-02-01), Ingraham et al.
patent: 2923684 (1960-02-01), Ingraham
patent: 3034988 (1962-05-01), Ingraham et al.
patent: 3278263 (1966-10-01), Cox
patent: 3547823 (1970-12-01), Mihara et al.
patent: 3547824 (1970-12-01), Mihara et al.
patent: 3583917 (1971-06-01), Mihara et al.
patent: 3600314 (1971-08-01), Haines
patent: 3640871 (1972-02-01), Kawamata et al.

Affiliated with

Also associated with

Rating

Process for the preparation of sulfur modified ferromagnetic chr 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 the preparation of sulfur modified ferromagnetic chr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the preparation of sulfur modified ferromagnetic chr will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-677418