Patent ID: 8315037
Filing Date: 2012-11-20
Classification: C04B,H01G

Abstract:
1. A dielectric ceramic having a composition of BaTiO 3 as the main component and R and Mg as accessory components, where R is at least one member selected from La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu, the dielectric ceramic comprising crystalline grains which have a core-shell structure in which no accessory component is present as a solid solution in a central portion of the crystalline grain and the accessory components arc present as a solid solution in a surface layer of the crystalline grain, and crystalline grains which have a homogeneous structure in which the accessory components are homogeneously present throughout the crystalline grain, wherein the core-shell crystalline grains and the homogeneous crystalline grains are present at an area ratio in the range of 91:9 to 99:1, and wherein the ratio R2/R1 is 0.8 or more and 3 or less where R2 is the mean grain size of the homogeneous crystalline grains and R1 is the mean grain size of the core-shell crystalline grains.