Method of manufacturing perovskite powder, perovskite powder manufactured by the same and multilayer ceramic electronic component

Abstract

There are provided a method of manufacturing perovskite powder, and perovskite powder and a multilayer ceramic electronic component manufactured thereof. The manufacturing method includes: washing metal oxide hydrate to remove impurities therefrom; adding pure water and an acid or a base to the metal oxide hydrate to prepare a metal oxide sol; mixing the metal oxide sol with a metal salt to form perovskite particle nuclei; and conducting grain growth of the perovskite particle nuclei by hydrothermal treatment to produce perovskite powder. The method of manufacturing perovskite powder and the perovskite powder manufactured by the same have advantages such as excellent crystallinity, reduced generation of fine powder, and favorable dispersion properties.

What is claimed is: 
     
         1 - 18 . (canceled) 
     
     
         19 . A multilayer ceramic electronic component including:
 a ceramic sintered body having laminated dielectric layers, each dielectric layer containing perovskite powder;   internal electrode layers formed on the dielectric layers; and   external electrodes provided outwardly of the ceramic sintered body and electrically connected to the internal electrodes,   wherein the perovskite powder is produced by: adding pure water and an acid or a base to metal oxide hydrate to prepare a metal oxide sol; mixing the metal oxide sol with a metal salt to form perovskite particle nuclei; and conducting grain growth of the perovskite particle nuclei.   
     
     
         20 . The multilayer ceramic electronic component of  claim 19 , wherein the perovskite powder is at least one selected from a group consisting of BaTiO 3 , BaTi x Zr 1-x O 3 , Ba x Y 1-x TiO 3 , Ba x Dy 1-x TiO 3  and Ba x Ho 1-x TiO 3  (0<x<1). 
     
     
         21 . The multilayer ceramic electronic component of  claim 19 , wherein the perovskite powder has an average particle diameter ranging from 40 to 200 nm and a crystal axial ratio (c/a) ranging from 1.0045 to 1.0100. 
     
     
         22 . The multilayer ceramic electronic component of  claim 19 , wherein the perovskite powder has an average particle diameter ranging from 40 to 60 nm and a crystal axial ratio (c/a) ranging from 1.0045 to 1.0075. 
     
     
         23 . The multilayer ceramic electronic component of  claim 19 , wherein the perovskite powder has an average particle diameter ranging from 60 to 80 nm and a crystal axial ratio (c/a) ranging from 1.0062 to 1.009. 
     
     
         24 . The multilayer ceramic electronic component of  claim 19 , wherein the perovskite powder has an average particle diameter ranging from 80 to 200 nm and a crystal axial ratio (c/a) ranging from 1.0080 to 1.01.