NICKEL BASED ULTRAFINE POWDER

摘要

In order to reduce the size of a laminated ceramic capacitor by reducing the thickness of a dielectric material, to increase the number of laminated dielectric layers and electrodes, and to elevate the capacity, the quantity of coarse particles of which particle diameters exceed 1 mupm is reduced from the metal powder used in the internal electrodes. There is provided a nickel-based ultra-fine powder, wherein the average particle diameter of primary particles is 0.05 to 0.3 mum, the number of the primary particles that have a particle diameter of 1 mum or larger is 50 ppm or less relative to the total number of the particles, and the number of the primary particles that have a particle diameter of 0.6 times or smaller than the average particle diameter is 10% or less relative to the total number of the particles. The nickel-based ultra-fine powder is produced from nickel chloride vapor or the like using a vapor-phase hydrogen reduction method.