| 摘要 |
PROBLEM TO BE SOLVED: To provide spherical NiP fine particles having excellent electric conduction resistance of the particles themselves and excellent monodispersibility, to provide a method therefor, and to provide electrically conductive particles for an anisotropic electrically conductive film. SOLUTION: The spherical NiP fine particle has a componential composition essentially consisting of Ni and comprising P, and is composed of a central part with a crystalline structure and a surface layer part with a structure where an NiP intermetallic compound is dispersed into an amorphous material, and the P content in the surface layer part is higher than that in the central part. Then, in the electrically conductive particle for an anisotropic electrically conductive film, the surface of the spherical NiP fine particle is coated with Au. The spherical NiP fine particle is produced, in the process where an aqueous solution of nickel salt, a mixed aqueous solution of a pH adjuster and a pH buffer, and an aqueous solution of a phosphorus-containing reducing agent are mixed, and are brought into reduction precipitation reaction, by adjusting the pH at the time when, they are mixed, and the reduction precipitation reaction is started, so as to be the alkaline one exceeding pH 7, and subjecting the spherical NiP fine particle obtained by the reduction precipitation reaction to heating treatment at≥300°C. COPYRIGHT: (C)2006,JPO&NCIPI
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