Dielectric ceramic composition and multilayer ceramic capacitor

1. A dielectric ceramic composition comprising:

a main component expressed as 100Ba m TiO 3 +xCuO+aRO n +bMnO+cMgO; and

a sintering additive, the dielectric ceramic composition containing 0.8 to 5.0 parts by weight of the sintering additive with respect to 100 parts by weight of the main component,

wherein coefficients 100, x, a, b, and c represent molar ratios; m represents the ratio of Ba to Ti; R represents at least one metal element selected from the group consisting of Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu; and n represents a positive number, and

wherein m, x, a, b, and c meet the following relationships:

0.990 ≦m≦ 1.050;

0.1 ≦x≦ 5.0;

9.0 ≦a≦ 20.0;

0.5 ≦b≦ 3.5; and

0≦ c≦ 4.0.

2. The dielectric ceramic composition according to claim 1 , further comprising MO as an additive, wherein M represents at least one metal element selected from Ni and Zn, the main component being expressed as 100Ba m TiO 3 +xCuO+aRO n +bMnO+cMgO+dMO, wherein c and d meet the following relationships:

0< c+d≦ 4.0; and

d>0.

3. The dielectric ceramic composition according to claim 2 , further comprising X(Zr,Hf)O 3 as a second additive in the main component, wherein X represents at least one metal element selected from Ba, Sr, and Ca, and wherein the content of the second additive is more than 0 mol and 15 mol or less with respect to 100 mol of Ba m TiO 3 .

4. The dielectric ceramic composition according to claim 1 , further comprising X(Zr,Hf)O 3 as an additive in the main component, wherein X represents at least one metal element selected from Ba, Sr, and Ca, and wherein the content of the additive is more than 0 mol and 15 mol or less with respect to 100 mol of Ba m TiO 3 .

5. The dielectric ceramic composition according to claim 1 , wherein the sintering additive is SiO 2 .

6. A multilayer ceramic capacitor comprising:

a plurality of dielectric ceramic layers;

internal electrodes, each internal electrode disposed between respective dielectric ceramic layers; and

external electrodes electrically connected to the internal electrodes,

wherein the dielectric ceramic layers are each composed of a dielectric ceramic composition comprising:

a main component expressed as 100Ba m TiO 3 +xCuO+aRO n +bMnO+cMgO; and

a sintering additive, the dielectric ceramic composition containing 0.8 to 5.0 parts by weight of the sintering additive with respect to 100 parts by weight of the main component,

wherein coefficients 100, x, a, b, and c represent molar ratios; m represents the ratio of Ba to Ti; R represents at least one metal element selected from the group consisting of Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu; and n represents a positive number, and

wherein m, x, a, b, and c meet the following relationships:

0.990 ≦m≦ 1.050;

0.1 ≦x≦ 5.0;

9.0 ≦a≦ 20.0;

0.5 ≦b≦ 3.5; and

0 ≦c≦ 4.0.

7. The multilayer ceramic capacitor according to claim 6 , wherein the internal electrodes are each composed of a conductive material containing Ni, a Ni alloy, Cu, or a Cu alloy.

8. The multilayer ceramic capacitor according to claim 7 , further comprising MO as an additive, wherein M represents at least one metal element selected from Ni and Zn, the main component being expressed as 100Ba m TiO 3 +xCuO+aRO n +bMnO+cMgO+dMO, wherein c and d meet the following relationships:

0< c+d≦ 4.0; and

d>0.

9. The multilayer ceramic capacitor according to claim 8 , further comprising X(Zr,Hf)O 3 as a second additive in the main component, wherein X represents at least one metal element selected from Ba, Sr, and Ca, and wherein the content of the second additive is more than 0 mol and 15 mol or less with respect to 100 mol of Ba m TiO 3 .

10. The multilayer ceramic capacitor according to claim 6 , further comprising MO as an additive, wherein M represents at least one metal element selected from Ni and Zn, the main component being expressed as 100Ba m TiO 3 +xCuO+aRO n +bMnO+cMgO+dMO, wherein c and d meet the following relationships:

0< c+d ≦4.0; and

d>0.

11. The multilayer ceramic capacitor according to claim 10 , further comprising X(Zr,Hf)O 3 as a second additive in the main component, wherein X represents at least one metal element selected from Ba, Sr, and Ca, and wherein the content of the second additive is more than 0 mol and 15 mol or less with respect to 100 mol of Ba m TiO 3 .

12. The multilayer ceramic capacitor according to claim 6 , further comprising X(Zr,Hf)O 3 as an additive in the main component, wherein X represents at least one metal element selected from Ba, Sr, and Ca, and wherein the content of the additive is more than 0 mol and 15 mol or less with respect to 100 mol of Ba m TiO 3 .

13. The multilayer ceramic capacitor according to claim 6 , wherein the sintering additive is SiO 2 .