Method for producing a ferromagnetic chromium oxide

Details Method for producing a ferromagnetic chromium oxide Method for producing a ferromagnetic chromium oxide

C - Chemistry, Metallurgy

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G

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C01G 37/02 (2006.01) G11B 5/706 (2006.01)

Patent

CA 1046239

METHOD FOR PRODUCING A FERROMAGNETIC CHROMIUM OXIDE ABSTRACT OF THE DISCLOSURE A method for the production of a ferromagnetic chromium oxide comprising: preparing a mixture including chromium trioxide and an aqueous solution of hydrogen per- oxide containing more than 0.05 percent by weight H2O2 based on the weight of chromium trioxide; heating said mixture at a rate in excess of 10°C/min. under an atmosphere of air, oxygen, nitrogen or inert gas at a pressure in the range of from 0.01 to 10 atmospheres, to a reaction temperature in the range of from 200°C to 600°C; maintaining the mixture at the reaction tem- perature for a period of from 1 minute to 5 hours; subjecting the thus treated reaction mixture to furnace cooling or air quenching to room temperature; washing the resultant chromium oxide product with distilled water; and drying said washed product, whereby there is produced a ferromagnetic chromium oxide having a high coercive force and a high saturation magnetization.

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