Dielectric ceramic composition

1. A dielectric ceramic composition comprising:

a component represented by composition formula {α(xBaO.yNd 2 O 3 .zTiO 2 )+β(2MgO.SiO 2 )} as a main component; and

zinc oxide, boron oxide, and a glass having a softening point of 570° C. or less as minor components with respect to the main component,

wherein x, y, and z that respectively represent molar ratios of BaO, Nd 2 O 3 , and TiO 2 satisfy

14 (mol %)≦ x≦ 19 (mol %),

12 (mol %)≦ y≦ 17 (mol %),

65 (mol %)≦ z≦ 71 (mol %), and

x+y+z= 100;

α and β that represent volume ratios of subcomponents in the main component satisfy

35 (vol %)≦α≦65 (vol %),

35 (vol %)≦β≦65 (vol %), and

α+β=100; and

when the minor components are respectively represented by aZnO, bB 2 O 3 , and cglass, a, b, and c that represent mass ratios of the respective minor components to the main component satisfy

0.0 (mass %)≦ a≦ 4.25 (mass %),

0.0 (mass %)≦ b≦ 5.5 (mass %),

4.5 (mass %)≦ c≦ 10.0 (mass %),

b≧a− 3, and

a+b+c= 10.

2. A dielectric ceramic composition comprising:

a component represented by composition formula {α(xBaO.yNd 2 O 3 .zTiO 2 )+β(2MgO.SiO 2 )} as a main component; and

zinc oxide, boron oxide, and a glass having a softening point of 570° C. or less as minor components with respect to the main component,

wherein x, y, and z that respectively represent molar ratios of BaO, Nd 2 O 3 , and TiO 2 satisfy

14 (mol %)≦ x≦ 19 (mol %),

12 (mol %)≦ y≦ 17 (mol %),

65 (mol %)≦ z≦ 71 (mol %), and

x+y+z= 100;

α and β that represent volume ratios of subcomponents in the main component satisfy

35 (vol %)≦α≦65 (vol %),

35 (vol %)≦β≦65 (vol %), and

α+β=100; and

when the minor components are respectively represented by aZnO, bB 2 O 3 , and cglass, a, b, and c that represent mass ratios of the respective minor components to the main component satisfy

0.0 (mass %)≦ a≦ 4.75 (mass %),

1.0 (mass %)≦ b≦ 6.5 (mass %),

3.5 (mass %)≦ c≦ 5.0 (mass %),

b≧a− 3, and

a+b+c= 10.

3. The dielectric ceramic composition according to claim 1 , wherein a, b, and c that represent the mass ratios of the respective minor components to the main component satisfy

0.0 (mass %)≦ a≦ 4.25 (mass %),

1.0 (mass %)≦ b≦ 5.5 (mass %),

4.5 (mass %)≦ c≦ 5.0 (mass %),

b≧a− 3, and

a+b+c= 10.

4. The dielectric ceramic composition according to claim 2 , wherein a, b, and c that represent the mass ratios of the respective minor components to the main component satisfy

0.0 (mass %)≦ a≦ 4.25 (mass %),

1.0 (mass %)≦ b≦ 5.5 (mass %),

4.5 (mass %)≦ c≦ 5.0 (mass %),

b≧a− 3, and

a+b+c= 10.