Patent ID: 8445396

Claim:
A dielectric ceramic comprising a composition represented by 100(BaTiO 3 +a BaZrO 3 )+ b R+ c Mg+ d Mn+ e Si in which R represents one or more elements selected from the group consisting of Sm, Eu, Gd, Tb, Dy, and Ho, 0 ≦a≦ 0.2, 8.0 ≦b≦ 12.0, 1.0 ≦c≦ 10.0, 0.1 ≦d≦ 3.0, 1.0 ≦e≦ 10.0, having first grains A of 0.7 μm or more in grain size, the first grains A having an average grain size Aave, and second grains B of 0.6 μm or less in grain size, the second grains B having an average grain size Bave for, wherein 0.8 μm≦ A ave≦2.0 μm, 0.1 μm≦ B ave≦0.5 μm, and A ave/ B ave≧3.0, and wherein an area ratio SA occupied by the first grains and an area ratio SB occupied by the second grains satisfy 0.3 ≦SA≦ 0.9, 0.1 ≦SB≦ 0.7, and 0.8 ≦SA+SB≦ 1.0.