Dielectric ceramic and laminated ceramic capacitor
A dielectric ceramic with stable insulation properties even after calcination under a reducing atmosphere, as is preferred for a laminated ceramic capacitor, is a CaTiO 3 composition containing Sn. It is preferable for the dielectric ceramic to contain, as its main component, (Ca 1-x Ba x Sn y )TiO 3 (0≦x<0.2, 0.01≦y<0.2) with a solution of Sn at the B site.
1. A dielectric ceramic comprising as its main component, (Ca 1-x Ba x )TiO 3 in which 0≦x<0.2 and Sn in an amount of 1 to less than 20 parts by mol with respect to 100 parts by mol of the main component.
2. The dielectric ceramic according to claim 1 whose main component comprises (Ca 1-x-y Ba x Sn y )TiO 3 in which 0≦x<0.2, and 0.01≦y<0.2.
3. The dielectric ceramic according to claim 2 in which x<0.15, and y<0.15.
4. The dielectric ceramic according to claim 3 in which the molar ratio of (Ca 1-x-y Ba x Sn y ) to Ti is 0.93 to 1.03.
5. A laminated ceramic capacitor comprising:
a laminated body including a plurality of laminated dielectric ceramic layers with internal electrodes disposed at different interfaces between adjacent dielectric ceramic layers, and a pair of external electrodes disposed on an outer surface of the laminated body so that each is electrically connected to a different internal electrodes,
wherein the dielectric ceramic layers comprise the dielectric ceramic according to claim 4 .
6. The laminated ceramic capacitor according to claim 5 , wherein the internal electrodes comprise Ni.
7. The dielectric ceramic according to claim 2 in which the molar ratio of (Ca 1-x-y Ba x Sn y ) to Ti is 0.93 to 1.03.
8. A laminated ceramic capacitor comprising:
a laminated body including a plurality of laminated dielectric ceramic layers with internal electrodes disposed at different interfaces between adjacent dielectric ceramic layers, and a pair of external electrodes disposed on an outer surface of the laminated body so that each is electrically connected to a different internal electrodes,
wherein the dielectric ceramic layers comprise the dielectric ceramic according to claim 7 .
9. A laminated ceramic capacitor comprising:
a laminated body including a plurality of laminated dielectric ceramic layers with internal electrodes disposed at different interfaces between adjacent dielectric ceramic layers, and a pair of external electrodes disposed on an outer surface of the laminated body so that each is electrically connected to a different internal electrodes,
wherein the dielectric ceramic layers comprise the dielectric ceramic according to claim 2 .
10. The laminated ceramic capacitor according to claim 9 , wherein the internal electrodes comprise Ni.
11. A laminated ceramic capacitor comprising:
a laminated body including a plurality of laminated dielectric ceramic layers with internal electrodes disposed at different interfaces between adjacent dielectric ceramic layers, and a pair of external electrodes disposed on an outer surface of the laminated body so that each is electrically connected to a different internal electrodes,
wherein the dielectric ceramic layers comprise the dielectric ceramic according to claim 3 .
12. The laminated ceramic capacitor according to claim 11 , wherein the internal electrodes comprise Ni.
13. The dielectric ceramic according to claim 1 in which x<0.15.
14. The dielectric ceramic according to claim 13 in which x>0.
15. A laminated ceramic capacitor comprising:
a laminated body including a plurality of laminated dielectric ceramic layers with internal electrodes disposed at different interfaces between adjacent dielectric ceramic layers, and a pair of external electrodes disposed on an outer surface of the laminated body so that each is electrically connected to a different internal electrodes,
wherein the dielectric ceramic layers comprise the dielectric ceramic according to claim 14 .
16. A laminated ceramic capacitor comprising:
a laminated body including a plurality of laminated dielectric ceramic layers with internal electrodes disposed at different interfaces between adjacent dielectric ceramic layers, and a pair of external electrodes disposed on an outer surface of the laminated body so that each is electrically connected to a different internal electrodes,
wherein the dielectric ceramic layers comprise the dielectric ceramic according to claim 13 .
17. The laminated ceramic capacitor according to claim 16 , wherein the internal electrodes comprise Ni.
18. The laminated ceramic capacitor according to claim 8 , wherein the internal electrodes comprise Ni.
19. A laminated ceramic capacitor comprising:
a laminated body including a plurality of laminated dielectric ceramic layers with internal electrodes disposed at different interfaces between adjacent dielectric ceramic layers, and a pair of external electrodes disposed on an outer surface of the laminated body so that each is electrically connected to a different internal electrodes,
wherein the dielectric ceramic layers comprise the dielectric ceramic according to claim 1 .
20. The laminated ceramic capacitor according to claim 19 , wherein the internal electrodes comprise Ni.