ACICULAR COBALT-MODIFIED IRON OXIDE AND PROCESS FOR ITS MANUFACTURE

The invention relates to acicular, cobalt-modified iron oxides consisting of a core of an iron oxide of the formula FeOx having values for X of 1.33 to 1.5 and a ferrite shell containing, based on the total amount of material, a total of 0.4 to 12% by weight of cobalt ions and up to 5% by weight of...

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Bibliographische Detailangaben
Hauptverfasser:	SCHWAB, EKKEHARD, AUWETER, HELMUT, VEITCH, RONALD JOHN
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	BASIC ELECTRIC ELEMENTS CHEMISTRY COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F ELECTRICITY INDUCTANCES INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER INORGANIC CHEMISTRY MAGNETS METALLURGY PHYSICS SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES TRANSFORMERS
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Beschreibung
Zusammenfassung:	The invention relates to acicular, cobalt-modified iron oxides consisting of a core of an iron oxide of the formula FeOx having values for X of 1.33 to 1.5 and a ferrite shell containing, based on the total amount of material, a total of 0.4 to 12% by weight of cobalt ions and up to 5% by weight of iron(II) ions, which iron oxides are distinguished by improved ageing resistance, particularly with regard to the coercive force, and a process for their preparation.