Toda Kogyo Corporation

Ryuji Fujita

Nanao Horiishi

Seiji Okazaki

Haruki Kurokawa

Kazutoshi Sanada

Shigehisa Yamamoto

Yuji Mishima

Hidetomo Unemoto

Koichiro Kanda

The fine barium titanate particles of the present invention have an average primary particle diameter of from 10 nm to less than 20 nm, a sphericity of 1.00 to 1.18, and a ratio of an average secondary particle diameter to the average primary particle diameter of 0.7 to 6.0. The fine barium titanate particles of the present invention can exhibit a small behavior particle diameter and can be readily monodispersed notwithstanding very fine particles, and as a result, can be suitably used as various dielectric materials because the particles are free from aggregation therebetween and have an excellent dispersibility.

Fine barium titanate particles

Disclosed herein are Ba-containing plate like magnetoplumbite type ferrite particles for magnetic recording having the composition of AO.n{(Fe.sub.1-X M.sub.X).sub.2 O.sub.3 } (wherein A represents Ba or Ba and Sr, M represents Zn and Ti, or Zn, Co and Ti, n=6.5-11.0, and x=0.05-0.25) and the change of coercive force of said particles at a temperature of 20.degree.-120.degree. C. in the range of -2.0 Oe/.degree.C. to +2.0 Oe/.degree.C., and magnetic recording media using the same.

Plate-like magnetoplumbite type ferrite particles for magnetic recording

Growing community of inventors

Sanyoonoda, Japan

Ryuji Fujita