Dielectric composition and multilayer ceramic electronic component including the same

1. A dielectric composition, comprising:

a base powder including Ba m TiO 3 , where 0.995≦m≦1.010;

a first subcomponent including 0.1 to 1.0 at % (x) of an oxide or carbonate containing at least one variable-valence acceptor element based on 100 moles of the base powder;

a second subcomponent including 0.01 to 3.0 at % (y) of an oxide or carbonate containing at least one fixed valence acceptor element based on 100 moles of the base powder;

a third subcomponent including an oxide or carbonate containing cerium (z) at % and at least one other rare-earth element (w) at % based on 100 moles of the base powder, where 0.01≦z≦x+4y and 0.01≦z+w≦x+4y;

a fourth subcomponent including at least one of an oxide or carbonate containing at least one of barium, calcium, aluminum, and silicon and glass containing silicon; and

a fifth subcomponent including 0.01 to 10.0 at % of an oxide containing zirconium based on 100 moles of the base powder,

wherein the variable-valence acceptor element of the first subcomponent is selected from the group consisting of manganese (Mn), vanadium (V), chromium (Cr), iron (Fe), nickel (Ni), cobalt (Co), copper (Cu), and zinc (Zn), and

the fixed valence acceptor element of the second subcomponent is magnesium (Mg).

2. The dielectric composition of claim 1 , wherein the fourth subcomponent is contained in an amount of 0.1 to 8.0 moles based on 100 moles of the base powder.

3. The dielectric composition of claim 1 , wherein the rare-earth element of the third subcomponent is selected from the group consisting of yttrium (Y), dysprosium (Dy), holmium (Ho), erbium (Er) and gadolinium (Gd), Nd (Neodynium), Sm (Samarium) and Yb (Ytterbium).

4. The dielectric composition of claim 1 , wherein the transition metal of the fourth subcomponent is selected from the group consisting of silicon (Si), barium (Ba), calcium (Ca), and aluminum (Al).

5. A dielectric composition, comprising:

a base powder including Ba m TiO 3 , where 0.995≦m≦1.010;

a first subcomponent including 0.1 to 1.0 at % (x) of an oxide or carbonate containing at least one variable-valence acceptor element based on 100 moles of the base powder;

a second subcomponent including an oxide or carbonate containing at least one fixed valence acceptor element;

a third subcomponent including an oxide or carbonate containing cerium (z) at % and at least one other rare-earth element (w) at % based on 100 moles of the base powder, where 0.01≦z≦x+4y and 0.01≦z+w≦x+4y;

a fourth subcomponent including 0.1 to 8.0 moles of at least one of an oxide or carbonate containing at least one of barium, calcium, aluminum, and silicon and glass containing silicon based on 100 moles of the base powder; and

a fifth subcomponent including 0.01 to 10.0 at % of an oxide containing zirconium based on 100 moles of the base powder,

wherein the variable-valence acceptor element of the first subcomponent is selected from the group consisting of manganese (Mn), vanadium (V), chromium (Cr), iron (Fe), nickel (Ni), cobalt (Co), copper (Cu), and zinc (Zn), and

the fixed valence acceptor element of the second subcomponent is magnesium (Mg).

6. The dielectric composition of claim 5 , wherein the second subcomponent is contained in an amount of 0.01 to 3.0 at % based on 100 moles of the base powder.

7. The dielectric composition of claim 5 , wherein the rare-earth element of the third subcomponent is selected from the group consisting of yttrium (Y), dysprosium (Dy), holmium (Ho), erbium (Er) and gadolinium (Gd), Nd (Neodynium), Sm (Samarium) and Yb (Ytterbium).

8. The dielectric composition of claim 5 , wherein the transition metal of the fourth subcomponent is selected from the group consisting of silicon (Si), barium (Ba), calcium (Ca), and aluminum (Al).

9. A multilayer ceramic electronic component, comprising:

a ceramic sintered body having a plurality of dielectric layers laminated therein;

a plurality of internal electrodes formed within the ceramic sintered body; and

at least one pair of external electrodes provided on external end surfaces of the ceramic sintered body and electrically connected to the internal electrodes,

wherein the dielectric layers include:

a base powder including Ba m TiO 3 , where 0.995≦m≦1.010;

a first subcomponent including 0.1 to 1.0 at % (x) of an oxide or carbonate containing at least one variable-valence acceptor element based on 100 moles of the base powder;

a second subcomponent including 0.01 to 3.0 at % (y) of an oxide or carbonate containing at least one fixed valence acceptor element based on 100 moles of the base powder;

a third subcomponent including an oxide or carbonate containing cerium (z) at % and at least one other rare-earth element (w) at % based on 100 moles of the base powder, where 0.01≦z≦x+4y and 0.01≦z+w≦x+4y;

a fourth subcomponent including at least one of an oxide or carbonate containing at least one of barium, calcium, aluminum, and silicon and glass containing silicon; and

a fifth subcomponent including 0.01 to 10.0 at % of an oxide containing zirconium based on 100 moles of the base powder,

wherein the variable-valence acceptor element of the first subcomponent is selected from the group consisting of manganese (Mn), vanadium (V), chromium (Cr), iron (Fe), nickel (Ni), cobalt (Co), copper (Cu), and zinc (Zn), and

the fixed valence acceptor element of the second subcomponent is magnesium (Mg).

10. The multilayer ceramic electronic component of claim 9 , wherein the dielectric layers each have a thickness of 0.1 to 10.0 μm.

11. The multilayer ceramic electronic component of claim 9 , wherein the internal electrodes include nickel (Ni) or a nickel (Ni) alloy.

12. The multilayer ceramic electronic component of claim 9 , wherein the internal electrodes and the dielectric layers are alternately laminated.

13. A multilayer ceramic electronic component, comprising:

a ceramic sintered body having a plurality of dielectric layers laminated therein;

a plurality of internal electrodes formed within the ceramic sintered body; and

at least one pair of external electrodes provided on external end surfaces of the ceramic sintered body and electrically connected to the internal electrodes,

wherein the dielectric layers include:

a base powder including Ba m TiO 3 , where 0.995≦m≦1.010;

a first subcomponent including 0.1 to 1.0 at % (x) of an oxide or carbonate containing at least one variable-valence acceptor element based on 100 moles of the base powder;

a second subcomponent including an oxide or carbonate containing at least one fixed valence acceptor element;

a third subcomponent including an oxide or carbonate containing cerium (z) at % and at least one other rare-earth element (w) at % based on 100 moles of the base powder, where 0.01≦z≦x+4y and 0.01≦z+w≦x+4y;

a fourth subcomponent including 0.1 to 8.0 moles of at least one of an oxide or carbonate containing at least one of barium, calcium, aluminum, and silicon and glass containing silicon based on 100 moles of the base powder; and

a fifth subcomponent including 0.01 to 10.0 at % of an oxide containing zirconium based on 100 moles of the base powder,

wherein the variable-valence acceptor element of the first subcomponent is selected from the group consisting of manganese (Mn), vanadium (V), chromium (Cr), iron (Fe), nickel (Ni), cobalt (Co), copper (Cu), and zinc (Zn), and

the fixed valence acceptor element of the second subcomponent is magnesium (Mg).

14. The multilayer ceramic electronic component of claim 13 , wherein the dielectric layers each have a thickness of 0.1 to 10.0 μm.

15. The multilayer ceramic electronic component of claim 13 , wherein the internal electrode include nickel (Ni) or a nickel (Ni) alloy.

16. The multilayer ceramic electronic component of claim 13 , wherein the internal electrodes and the dielectric layers are alternately laminated.