Dielectric ceramic composition and electronic device

1. A dielectric ceramic composition comprising:

a main component expressed by a general formula:

(Ba 1-x-y Sr x Ca y ) m (Ti 1-z Zr z )O 3 ,

a first subcomponent comprising Mg oxide,

a second subcomponent comprising at least one oxide selected from oxides of Mn and Cr,

a third subcomponent comprising R oxide, wherein R is selected from at least one of Y, La Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, and Yb, and

a fourth subcomponent comprising an oxide including Si,

wherein the general formula shows

0.20≦x≦0.40,

0≦y≦0.20,

0≦z≦0.30, and

0.950≦m≦1.050,

wherein ratios of the respective subcomponents with respect to 100 moles of said main component are

the first subcomponent: 0.5 to 5 moles (in terms of element),

the second subcomponent: 0.05 to 2 moles (in terms of element),

the third subcomponent: 1 to 8 moles (in terms of element),

the fourth subcomponent: 0.5 to 5 moles (in terms of an oxide or a complex oxide), and

within a temperature range of −25 to 105° C., a capacitance change rate on the basis of capacitance at 25° C., with respect to slope “a” of a line which shows capacity temperature characteristic on the basis of capacitance at 25° C., is within −15 to +5%, and said slope “a” is −7000 to −3000 ppm/° C.

2. The dielectric ceramic composition as set forth in claim 1 ,

wherein y and z in the general formula of the main component are 0.

3. The dielectric ceramic composition as set forth in claim 1 further comprising:

a fifth subcomponent comprising at least one oxide selected from oxides of V, Mo, W, Ta, and Nb,

wherein a ratio of the fifth subcomponent with respect to 100 moles of said main component is 0 to 0.2 moles in terms of each element.

4. The dielectric ceramic composition as set forth in claim 2 further comprising:

a fifth subcomponent comprising at least one oxide selected from oxides of V, Mo, W, Ta, and Nb,

wherein a ratio of the fifth subcomponent with respect to 100 moles of said main component is 0 to 0.2 moles in terms of each element.

5. An electronic device comprising dielectric layers composed of the dielectric ceramic composition as set forth in claim 1 .

6. An electronic device comprising dielectric layers composed of the dielectric ceramic composition as set forth in claim 2 .

7. An electronic device comprising dielectric layers composed of the dielectric ceramic composition as set forth in claim 3 .

8. An electronic device comprising dielectric layers composed of the dielectric ceramic composition as set forth in claim 4 .