Plate-like composite ferrite fine particles suitable for use in

Details Plate-like composite ferrite fine particles suitable for use in Plate-like composite ferrite fine particles suitable for use in

1990-07-24

1992-01-07

Cooper, Jack

Stock material or miscellaneous articles

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

Particulate matter

252 6259, 252 6262, 252 6263, 252 6264, 427127, 427128, 427130, 428402, 428694, B32B 516

Patent

active

050790927

ABSTRACT:
Disclosed herein are plate-like composite ferrite fine particles for magnetic recording comprising plate-like composite ferrite containing Ba fine particles which contain Ti of 2 to 5.0 atomic % based on Fe.sup.3+ and Ni in the range of 1.2.ltoreq.Ni/Ti.ltoreq.4 by molar ratio, which have zinc in the vicinity of the particles surfaces in the form of a solid solution, which have an average particle diameter of 0.01 .mu.m to 0.08 .mu.m, and the coercive force of which scarcely varies with the rise in temperature in the temperature range of -20.degree. C. to 120.degree. C., and a process for producing such plate-like composite ferrite fine particles.

REFERENCES:
patent: 4851292 (1989-07-01), Nagai et al.

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