Process for the manufacture of ferromagnetic chromium dioxide

Details Process for the manufacture of ferromagnetic chromium dioxide Process for the manufacture of ferromagnetic chromium dioxide

1980-10-21

1982-07-20

Cooper, Jack

Compositions

Magnetic

Iron-oxygen compound containing

252 6251, 423607, C01G 37027, H01F 136

Patent

active

043404944

ABSTRACT:
A process for the manufacture of ferromagnetic chromium dioxide modified with foreign elements, by reacting oxides of trivalent and hexavalent chromium under superatmospheric pressure at an elevated temperature in the presence of water and of antimony(III) oxide as modifier, with or without other modifiers in an amount not exceeding 15% by weight, wherein the antimony(III) oxide employed as modifier is, to the extent of more than one-third, present as the senarmontite cubic modification, has a specific surface area, measured by the BET method, of from 1.5 to 15 m.sup.2 /g, and is added in a total amount of up to 0.5% by weight, based on the resulting chromium dioxide.

REFERENCES:
patent: 3034988 (1962-05-01), Ingraham et al.
patent: 3117093 (1964-01-01), Arthur et al.
patent: 3278263 (1966-10-01), Cox
patent: 3687851 (1972-08-01), Hartmann et al.
Kirk-Othmer, "Encyclopedia of Chemical Technology", vol. 2, 1963, pp. 573-574.

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