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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Bibliographic Details
Main Authors SCHWAB, EKKEHARD, AUWETER, HELMUT, VEITCH, RONALD JOHN
Format Patent
LanguageEnglish
German
Published 07.08.1991
Edition5
Subjects
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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Summary: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.
Bibliography:Application Number: EP19900107214