Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Patent
1990-08-13
1992-06-02
Cooper, Jack
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
252 6259, 252 6262, 252 6263, 427127, C04B 3526
Patent
active
051185750
ABSTRACT:
Disclosed herein are plate-like composite Ba-containing ferrite fine particles for magnetic recording, containing Ni, Co and Ti in the molar ratios defined by 0.02.ltoreq.Ni/Fe.ltoreq.0.10, 0.01.ltoreq.Co/Fe.ltoreq.0.10 and 0.01.ltoreq.Ti/Fe.ltoreq.0.10, but 0.03.ltoreq.(Ni+Co)/Fe.ltoreq.0.14 and Ti/(Ni+Co)<1, and having zinc in the vicinity of the particle surface in the form of solid solution, and a temperature dependence of coercive force of said particles in the range of -0.5 to +2.0 Oe/.degree.C. in the temperature range of -20.degree. to 120.degree. C., and a process for producing the same.
REFERENCES:
patent: 4752407 (1988-06-01), Nagai et al.
patent: 4770933 (1988-07-01), Kitahata et al.
Maekawa Masaaki
Sugita Norio
Cooper Jack
Toda Kogyo Corp.
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