Hexagonal plate-like barium ferrite particles for magnetic recor

Details Hexagonal plate-like barium ferrite particles for magnetic recor Hexagonal plate-like barium ferrite particles for magnetic recor

1984-09-24

1987-10-06

Cooper, Jack

Compositions

Magnetic

Iron-oxygen compound containing

252 6256, 252 6262, 252 6263, C04B 3526

Patent

active

046981829

ABSTRACT:
Disclosed herein are hexagonal plate-like barium ferrite particles for magnetic recording, represented by the formula: BaFe.sub.12-x-y M.sub.x Ti.sub.y O.sub.19 wherein x and y are independently 0.6 to 1.2 and M is Co(II) or Co(II) and a divalent metal other than Co, having the width of the particle of 0.1 to 0.4 micrometer and a BET specific surface area (S) of 20 to 50 m.sup.2 /g, and showing a magnetization (M) of larger than 40 emu/g in a magnetic field of 10 KOe and a coercive force (Hc) of 500 to 1000 Oe, and a process for producing the same.

REFERENCES:
patent: 4309459 (1982-01-01), Tokuoka
patent: 4341648 (1982-07-01), Kubo et al.
patent: 4414124 (1983-11-01), Endo et al.

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