| 摘要 |
PROBLEM TO BE SOLVED: To provide spherical nickel microparticles with high electroconductivity and superior monodispersibility, and to provide a production method therefor. SOLUTION: The spherical nickel microparticles have a crystalline structure, particle sizes of 1 to 10μm by d<SB>50</SB>, and a particle size distribution of [(d<SB>90</SB>-d<SB>10</SB>)/d<SB>50</SB>]≤1.0, wherein d<SB>90</SB>, d<SB>10</SB>and d<SB>50</SB>represent particle sizes showing 90 vol.%, 10 vol.% and 50 vol.% respectively in a cumulative distribution curve. The method for producing the spherical nickel microparticles includes mixing an aqueous solution of a nickel salt, a pH-adjusting aqueous solution containing a pH-adjusting agent and a complexing agent, and an aqueous solution of a reducing agent to cause a reduction and precipitation reaction in the mixture. Sodium hydroxide and/or potassium hydroxide are used for the pH-adjusting agent, and ammonia is used for the complexing agent. Sodium hydroxide and/or potassium hydroxide are controlled so as to constitute 0.05 to 1.3 (kmol/m<SP>3</SP>) and ammonia is controlled so as to constitute 0.5 to 2.0 (kmol/m<SP>3</SP>) by concentration in the pH-adjusting aqueous solution. COPYRIGHT: (C)2008,JPO&INPIT
|
