Plate-like magnetoplumbite ferrite particles for magnetic record

Details Plate-like magnetoplumbite ferrite particles for magnetic record Plate-like magnetoplumbite ferrite particles for magnetic record

1987-12-07

1988-11-01

Cooper, Jack

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

252 6259, 252 6262, 252 6263, 427127, 428693, 428694, C04B 3526

Patent

active

047819812

ABSTRACT:
Disclosed herein are Ba-containing plate-like magnetoplumbite type ferrite particles for magnetic recording containing ions of one metal (II) selected from Ni and Zn and ions of one metal (IV) selected from Ti, Sn and Zr, and having zinc incorporated as a solid solution close to the particle surface and the change of coercive force of said particles at a temperature of -20.degree. to 120.degree. C. in the range of -0.5 to +0.5 Oe/.degree.C., and a process for producing the same.

REFERENCES:
patent: 4259368 (1981-03-01), Rudolf et al.
patent: 4414124 (1983-11-01), Endo et al.
patent: 4561988 (1985-12-01), Nagai et al.
patent: 4584242 (1986-04-01), Nagai et al.
patent: 4683167 (1987-07-01), Scott et al.

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