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A cobalt-doped, acicular ferrimagnetic iron oxide having an FeO content of about 16 to 24%, by weight, and a cobalt content of about 0.7 to 2.4%, by weight, the coercive force amounting to at least about 425 Oe+175 Oe/%, by weight, of Co is produced by precipitating and oxidizing a cobalt-containing...

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Bibliographische Detailangaben
Hauptverfasser:	HAINRITSUHI KURISUCHIYAN SHIYOTSUPAA, RUUTSU RAITONAA, FUORUKAA HAANKAMU, GUNTAA BUKUSUBAUMU
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES BASIC ELECTRIC ELEMENTS CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F CORRECTING FLUIDS DYES ELECTRICITY FILLING PASTES INDUCTANCES INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER INKS INORGANIC CHEMISTRY MAGNETS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING PHYSICS POLISHES PREPARATION OF CARBON BLACK SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES TRANSFORMERS TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	A cobalt-doped, acicular ferrimagnetic iron oxide having an FeO content of about 16 to 24%, by weight, and a cobalt content of about 0.7 to 2.4%, by weight, the coercive force amounting to at least about 425 Oe+175 Oe/%, by weight, of Co is produced by precipitating and oxidizing a cobalt-containing aqueous iron (ii) salt solution, reducing the precipitate to Fe3O4, partially reoxidizing to adjust the FeO content and heat treating under inert conditions at a temperature from about 600 DEG to 800 DEG C.