Dielectric ceramic composition, electronic device, and multilayer ceramic capacitor

Abstract

A dielectric ceramic composition comprised of at least dielectric particles having barium titanate as its main ingredient, wherein the ratio of dielectric particles having a surface diffusion structure comprised of a main ingredient phase comprised of the main ingredient and a diffusion phase present around the ingredient phase with respect to said dielectric particles is 60% or more the ratio of dielectric particles having a domain in the main ingredient phase with respect to the dielectric particles having the surface diffusion structure is 20% or less. According to the present invention, a dielectric ceramic composition and electric device realizing good high temperature accelerated life can be provided.

1 . A dielectric ceramic composition comprised of at least dielectric particles having barium titanate as its main ingredient, wherein 
 the ratio of dielectric particles having a surface diffusion structure including a main ingredient phase comprised of the main ingredient and a diffusion phase present around the main ingredient phase with respect to all of said dielectric particles is 60% or more and    the ratio of dielectric particles having a domain in the main ingredient phase with respect to the dielectric particles having the surface diffusion structure is 20% or less.    
   
   
       2 . The dielectric ceramic composition as set forth in  claim 1 , wherein 
 said dielectric particles include not only the dielectric particles having the surface diffusion structure but also dielectric particles without the surface diffusion structure.    
   
   
       3 . The dielectric ceramic composition as set forth in  claim 1 , wherein 
 when calculating an average particle size of the dielectric particles forming the dielectric ceramic composition in the form of D50, the ratio of the dielectric particles having the surface diffusion structure is 60% or more with respect to dielectric particles exhibiting the value of the average particle size D50.    
   
   
       4 . An electronic device having dielectric layers comprised of the dielectric ceramic composition as set forth in  claim 1 .  
   
   
       5 . A multilayer ceramic capacitor having a capacitor body including dielectric layers comprised of the dielectric ceramic composition as set forth in  claim 1  and internal electrode layers alternately stacked.  
   
   
       6 . The dielectric ceramic composition as set forth in  claim 2 , wherein 
 when calculating an average particle size of the dielectric particles forming the dielectric ceramic composition in the form of D50, the ratio of the dielectric particles having the surface diffusion structure is 60% or more with respect to dielectric particles exhibiting the value of the average particle size D50.    
   
   
       7 . An electronic device having dielectric layers comprised of the dielectric ceramic composition as set forth in  claim 2 .  
   
   
       8 . An electronic device having dielectric layers comprised of the dielectric ceramic composition as set forth in  claim 3 .  
   
   
       9 . An electronic device having dielectric layers comprised of the dielectric ceramic composition as set forth in  claim 6 .  
   
   
       10 . A multilayer ceramic capacitor having a capacitor body including dielectric layers comprised of the dielectric ceramic composition as set forth in  claim 2  and internal electrode layers alternately stacked.  
   
   
       11 . A multilayer ceramic capacitor having a capacitor body including dielectric layers comprised of the dielectric ceramic composition as set forth in  claim 3  and internal electrode layers alternately stacked.  
   
   
       12 . A multilayer ceramic capacitor having a capacitor body including dielectric layers comprised of the dielectric ceramic composition as set forth in  claim 6  and internal electrode layers alternately stacked.