Preparation of ferromagnetic chromium dioxide

Details Preparation of ferromagnetic chromium dioxide Preparation of ferromagnetic chromium dioxide

G - Physics

11

B

31/134, 31/204,

G11B 7/24 (2006.01) C01G 37/027 (2006.01) G11B 5/706 (2006.01)

Patent

CA 1269234

ABSTRACT OF THE DISCLOSURE: The invention relates to a process for the preparation of a ferromagnetic chromium dioxide by converting oxides of trivalent and hexavalent chromium under a pressure of from 100 to 700 bar and at a temperature of from 200° to 600°C in the presence of water, an antimony modifier and acicular iron oxide particles or acicular iron particles in an amount of not more than 15% by weight comprising adding an antimony compound as a modifier in the form of a water-soluble salt in an amount of at least 0.1% by weight but less than 4% by weight, based on the resulting chromium dioxide and said iron oxide or iron particles to a mixture of hexavalent chromium oxide and water, adding trivalent chromium oxide thereto and subjecting the resultant mixture to said pressure and temperature, with a proviso that the water-soluble antimony compound contains at least one organic molecular moiety anion which is oxidized by the oxide of hexavalent chromium with the evolution of gas when said antimony compound is added to a mixture of said hexavalent chromium oxide and water. This process allows the preparation of ferromagnetic chromium dioxides having a high coercive force while at the same time reducing the amount of modifiers required for this purpose.

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