Patent ID: 7572406
Filing Date: 2009-08-11
Classification: B82Y,C01G,C01P,C04B,H01G,Y10T

Abstract:
1. A method for manufacturing a multi-layer ceramic capacitor comprising the steps of: manufacturing ceramic powder, the ceramic powder manufacturing step comprising synthesizing ceramic powder by a non-wet synthesis method and heat-treating the synthesized ceramic powder in a solution; forming green sheets by using slurry including the ceramic powder as a main component thereof; forming an array of unsintered internal electrode layer on the green sheets; obtaining a laminated body by compressing a stack, the stack including the green sheets having thereon the unsintered internal electrode layers; attaining unit chips by dicing the laminated body into pieces of a chip size and sintering the pieces, each unit chip having two opposing surfaces at which the sintered internal electrodes are alternately exposed; and forming a pair of external electrodes at surfaces of each unit chip to be connected to exposed edges of the internal electrodes, wherein the ceramic powder has a perovskite structure, wherein the ceramic powder has a crystal lattice of a tetragonal system; particles of the ceramic powder are equal to or less than 0.2 μm; a c/a axial ratio of the crystal lattice is equal to or greater than 1.006; and a ratio of area occupied by holes in a single particle of the ceramic powder is equal to or less than 5%, wherein a particle diameter distribution of the ceramic powder is less than 30%, the particle diameter distribution being standard deviation/mean diameter of particles, and wherein the particle diameter distribution being less than 30% is obtained during the heat-treating step.