Patent ID: 6254991
Filing Date: 2001-07-03
Classification: C04B,H01G,Y10T

Abstract:
A ceramic powder prepared by dissolving a crystalline ceramic powder in water so as to leave a core portion of the crystalline ceramic powder while heating;wherein the ceramic powder is selected from the group consisting of barium titanate powder, barium titanate zirconate powder, lead titanate zirconate powder and lead titanate powdergradually cooling the thus-dissolved crystalline ceramic powder and water containing an additive which is selected from the group consisting of Nb.sub.2 O.sub.5, Co.sub.3 O.sub.4, MnO.sub.2, Ta.sub.2 O.sub.5 and VO.sub.5 to deposit a component of the crystalline ceramic powder on and around surfaces of the core portion thereof as a deposited material from the water; andfiring a mixture of the crystalline ceramic powder thus obtained with an additive at high temperature to subject the deposited material and the additive to solid phase reaction to form a shell portion on and around the core portion of crystalline ceramic powder;wherein the shell incorporates both the crystalline ceramic powder and the additive.