Process for the preparation of magnetized hexagonal ferrites, us

Details Process for the preparation of magnetized hexagonal ferrites, us Process for the preparation of magnetized hexagonal ferrites, us

1985-12-10

1987-06-09

Cooper, Jack

Compositions

Magnetic

Iron-oxygen compound containing

252 626, 252 6262, 252 6263, 252 6264, 423594, C04B 3526

Patent

active

046718850

ABSTRACT:
Magnetic hexagonal ferrites, in which ferrites the iron atom may be optionally substituted (substituted or unsubstituted barium hexaferrites, etc.), are prepared in high yields, and under non-corrosive conditions by a hydrothermal synthesis reaction between at least one alkali metal ferrite and a compound which releases an alkaline-earth metal ion in water (baryta, etc.) and optionally one or more alkali metal salt(s) of metal oxides. Magnetic hexagonal ferrites can be used as materials for permanent magnets and for ultrahigh frequency components or for magnetic recording materials. For example, ferromagnetic particles having a specific magnetization of at least 65 emu/g and a coercive field strength of at least 2500 oersteds can be prepared.

REFERENCES:
Hartmut Hibst, "Hexagonal Ferrites from Melts and Aqueous Solutions, Magnetic Recording Materials", Angew, Chem. Int. Ed., Engl. 21, (1982) 270-282.

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