Process for obtaining chromium dioxide CrO.sub.2

Details Process for obtaining chromium dioxide CrO.sub.2 Process for obtaining chromium dioxide CrO.sub.2

1976-10-07

1978-05-30

Carter, Herbert T.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

252 6251, C01G 3702

Patent

active

040924394

ABSTRACT:
Chromium dioxide CrO.sub.2 is prepared by oxidizing hydrated trivalent chromium oxide Cr.sub.2 O.sub.3, xH.sub.2 O, where x is at least 1, at a temperature of at least 350.degree. C and under pressures of at least 2 kilobars. The reaction is carried out in an oxidizing medium, which is a solid or an aqueous liquid solution, essentially constituted by a compound of the formula HXOy, zH.sub.2 O, wherein X represents an atom of chlorine or iodine, y is a positive integer less than or equal to 4, and z is a number which is a function of the dilution of said compound in the solution or a function of the crystallization water in the case of a solid oxidizing agent.
The product is useful in any device requiring a compound which is ferromagnetic at a temperature less than 116.degree. C and notably in magnetic tapes.

REFERENCES:
patent: 3278263 (1966-11-01), Cox
patent: 3529930 (1970-09-01), Bottjer et al.
patent: 3778373 (1973-12-01), Robbins
patent: 3929978 (1975-12-01), Morero et al.
patent: 3954641 (1976-05-01), Kawamata et al.
patent: 3956151 (1976-05-01), Kawamata et al.

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