Magnetic fe oxide and process for producing the same

Details Magnetic fe oxide and process for producing the same Magnetic fe oxide and process for producing the same

H - Electricity

01

F

31/133

H01F 1/04 (2006.01) G11B 5/706 (2006.01) H01F 1/06 (2006.01)

Patent

CA 1056150

ABSTRACT OF THE DISCLOSURE A magnetic Fe oxide containing Co, and optionally, a divalent metal, in which the oxidation degree indicated by the following formula ranges from about 30% to 80%; Oxidation Degree = Image wherein y is the amount of the Co, plus the divalent metal if present, in atomic % contained in the magnetic Fe oxide, and R is the ratio of the divalent Fe ion to the total Fe ions; and a process for producing a magnetic Fe oxide containing Co, and optionally, a divalent metal, and having an oxidizing degree of about 30 to 80%, which comprises dehydrating and reducing goethite containing Co, and optionally, the divalent metal, to obtain magnetite containing Co, and optionally, a divalent metal, and oxidizing gradually the magnetite at a relatively low temperature of lower than about 100°C.

221442

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