Patent ID: 8107219

Claim:
A dielectric ceramic, comprising crystal grains comprising barium titanate as a main component and grain boundaries locating between or among the crystal grains, wherein the dielectric ceramic contains magnesium, yttrium, manganese and niobium, wherein a molar ratio of magnesium to barium is 0.01 to 0.06, a molar ratio of yttrium to barium is 0.0014 to 0.06 and a molar ratio of manganese to barium is 0.0002 to 0.03, wherein the dielectric ceramic further contains niobium, wherein the mass ratio of niobium to barium titanate is equivalent to 4.2 to 33.3 parts by mass of Nb 2 O 5 with respect to 100 parts by mass of barium titanate, and wherein an average diameter of the crystal grains is about 0.05 to about 0.25 μm.