Cobalt modified iron oxides

Cobalt modified iron oxides

Acicular, gamma, cobalt-modified, iron oxide, magnetic particles produced by: coprecipitation of about 25 percent of the ferrous and cobaltous ions in a slightly alkaline aqueous medium; thereafter oxidize to a slightly acid medium; coprecipitate balance of metallic ions and oxidize; recover the alp...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: FESSLER, ROBERT GLENN, TRANDELL, ROGER FRANCIS
Format: Patent
Sprache:eng
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:Acicular, gamma, cobalt-modified, iron oxide, magnetic particles produced by: coprecipitation of about 25 percent of the ferrous and cobaltous ions in a slightly alkaline aqueous medium; thereafter oxidize to a slightly acid medium; coprecipitate balance of metallic ions and oxidize; recover the alpha form of cobalt-modified ferric oxide; reduce particles with hydrogen; and, thereafter oxidize to the gamma form, which process is characterized by almost quantative recovery of the cobaltous ion by raising the pH to about 10 of the slurry containing the alpha particles.