Novel ferromagnetic chromium dioxide and rhodium dioxide materia

Details Novel ferromagnetic chromium dioxide and rhodium dioxide materia Novel ferromagnetic chromium dioxide and rhodium dioxide materia

1978-09-22

1982-01-19

Cooper, Jack

Stock material or miscellaneous articles

Composite

Of inorganic material

428692, 252 6251, C01G 37027

Patent

active

043117708

ABSTRACT:
Process for making a novel ferromagnetic chromium dioxide and rhodium dioxide material in the form of a solid solution Cr.sub.1-x Rh.sub.x O.sub.2 where x is a number between 0 and 0.5.
It essentially comprises oxidation, under suitable conditions of temperature and pressure, of hydrated or anhydrous Cr.sub.2 O.sub.3 or of a precursor of Cr.sub.2 O.sub.3, in the presence of (1) an appropriate amount of a compound of rhodium III able to give RhO.sub.2 under reaction conditions and (2) of an oxidizing agent consisting of an oxygenated compound free from metallic cations other than chromium and having, under the reaction conditions, a partial oxygen pressure at least equal to that corresponding, under the same conditions of temperature and pressure, to the equilibria Cr.sub.2 O.sub.3 +1/2O.sub.2 .revreaction.2CrO.sub.2 and Rh.sub.2 O.sub.3 +1/2O.sub.2 .revreaction.2RhO.sub.2 as well as eventually (3) of dilution water and/or of at least an additional doping agent acting as buffer in the reaction medium and/or a conventional modifying agent.
The invention is useful for the manufacture of a ferromagnetic material possessing improved magnetic characteristics.

REFERENCES:
patent: 2885365 (1959-05-01), Oppegard
patent: 3034988 (1962-05-01), Ingraham et al.
patent: 3278263 (1966-10-01), Cox
patent: 3875297 (1975-04-01), Robbins
patent: 4092439 (1978-05-01), Demazeau et al.
Haines, "IBM Tech. Disclosure Bull.", vol. 12, No. 5, pp. 676-677.
Muller et al., "J. of the Less Common Metals", 1968, 16, pp. 129-146.

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