Dielectric ceramic composition and ceramic electronic device
View Patent ↗A dielectric ceramic composition comprises barium titanate as a main component, and as subcomponents, 1.00 to 2.50 moles of an oxide of Mg, 0.01 to 0.20 mole of an oxide of Mn and/or Cr, 0.03 to 0.15 mole of an oxide of at least one element selected from a group consisting of V, Mo and W, 0.20 to 1.50 mole of an oxide of R1 where R1 is at least one selected from a group consisting of Y and Ho, 0.20 to 1.50 mole of an oxide of R2 where R2 is at least one selected from a group consisting of Eu, Gd and Tb and 0.30 to 1.50 mole of an oxide of Si and/or B, in terms of each oxide with respect to 100 moles of the barium titanate.
1. A dielectric ceramic composition comprising barium titanate as a main component, and as subcomponents,
1.00 to 2.50 moles of an oxide of Mg,
0.01 to 0.20 mole of an oxide of Mn and/or Cr,
0.03 to 0.15 mole of an oxide of at least one element selected from a group consisting of V, Mo and W,
0.20 to 1.50 mole of an oxide of R1 where R1 is at least one selected from a group consisting of Y and Ho,
0.20 to 1.50 mole of an oxide of R2 where R2 is at least one selected from a group consisting of Eu, Gd and Tb and
0.30 to 1.50 mole of an oxide of Si and/or B,
in terms of each oxide with respect to 100 moles of said barium titanate, wherein:
α and β satisfy a relation of 0.25≦β/(α+β)<0.85 when α and β are respectively defined in mole as a content of the oxide of R1 in terms of R1 2 O 3 and a content of the oxide of R2 in terms of R2 2 O 3 ; and
a content of A (A is the total of Ba and Ca in the dielectric ceramic composition), a content of B (B is the total of Ti and Zr in the dielectric ceramic composition) satisfy a relation of 1.000≦A/B≦1.006 in the dielectric ceramic composition.
2. The dielectric ceramic composition as set forth in claim 1 , wherein said R2 is Gd or Tb.
3. The dielectric ceramic composition as set forth in claim 2 , wherein said R2 is Tb.
4. A ceramic electronic device having a dielectric layer, composed of the dielectric ceramic composition as set forth in claim 1 , and an electrode.
5. A ceramic electronic device having a dielectric layer, composed of the dielectric ceramic composition as set forth in claim 2 , and an electrode.
6. A ceramic electronic device having a dielectric layer, composed of the dielectric ceramic composition as set forth in claim 3 , and an electrode.
7. The ceramic electronic device as set forth in claim 4 , wherein a thickness of said dielectric layer is 1.0 μm or less.
8. The ceramic electronic device as set forth in claim 5 , wherein a thickness of said dielectric layer is 1.0 μm or less.
9. The ceramic electronic device as set forth in claim 6 , wherein a thickness of said dielectric layer is 1.0 μm or less.
10. The ceramic electronic device as set forth in claim 4 , wherein an average particle diameter of a dielectric particle of said dielectric layer is 0.1 to 0.3 μm.
11. The ceramic electronic device as set forth in claim 5 , wherein an average particle diameter of a dielectric particle of said dielectric layer is 0.1 to 0.3 μm.
12. The ceramic electronic device as set forth in claim 6 , wherein an average particle diameter of a dielectric particle of said dielectric layer is 0.1 to 0.3 μm.
13. The ceramic electronic device as set forth in claim 7 , wherein an average particle diameter of a dielectric particle of said dielectric layer is 0.1 to 0.3 μm.
14. The ceramic electronic device as set forth in claim 8 , wherein an average particle diameter of a dielectric particle of said dielectric layer is 0.1 to 0.3 μm.
15. The ceramic electronic device as set forth in claim 9 , wherein an average particle diameter of a dielectric particle of said dielectric layer is 0.1 to 0.3 μm.