Process for preparing ferromagnetic chromium dioxide

Details Process for preparing ferromagnetic chromium dioxide Process for preparing ferromagnetic chromium dioxide

1975-04-29

1976-09-07

Cooper, Jack

Compositions

Magnetic

Chromium or chromium compound containing

423607, 252 6255, 252 6256, C01G 3702

Patent

active

039793109

ABSTRACT:
Ferromagnetic chromium dioxide is prepared by thermally decomposing, at a temperature of 250.degree.-500.degree.C, and a pressure of at least 80 atmospheres, a mixture of hydrated trivalent chromium chromate of the formula Cr.sub.2 (CrO.sub.4).sub.3.nH.sub.2 O, wherein n is 7-12, and antimony or a compound thereof, the amount of antimony in the mixture being between 0.2 and 1.8% by weight based on the weight of anhydrous Cr.sub.2 (CrO.sub.4).sub.3. In another embodiment, other known modifiers for chromium dioxide, such as lanthanum, lithium, strontium, iron or lead, or a compound thereof may be added to the mixture of chromium chromate and antimony. The amount of said other modifiers is between 0.1 and 2% by weight of the element, based on the weight of anhydrous Cr.sub. 2 (CrO.sub.4).sub.3.

REFERENCES:
patent: 2923683 (1960-02-02), Ingraham et al.
patent: 3034988 (1962-05-01), Ingraham et al.
patent: 3874923 (1975-04-01), Montiglio et al.

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