Nickel-based ultrafine powder

Abstract

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 μpm 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 μm, the number of the primary particles that have a particle diameter of 1 μm 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.

1 . A nickel-based ultra-fine powder, wherein the average particle diameter of primary particles is 0.05 to 0.3 μm, the number of the primary particles that have a particle diameter of 1 μm 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.  
   
   
       2 . The nickel-based ultra-fine powder according to  claim 1 , wherein the nickel-based ultra-fine powder is produced from nickel chloride vapor using a vapor-phase hydrogen reduction method.  
   
   
       3 . The nickel-based ultra-fine powder according to  claim 1 , wherein the nickel-based ultra-fine powder is used for a multilayer ceramic capacitor.  
   
   
       4 . The nickel-based ultra-fine powder according to  claim 2 , wherein the nickel-based ultra-fine powder is used for a multilayer ceramic capacitor.