Dielectric ceramic composition and multilayer ceramic capacitor including the same

Patent metadata

Field	Value
Publication number	US-9190209-B2
Application number	US-201313924411-A
Country	US
Kind code	B2
Filing date	Jun 21, 2013
Priority date	Mar 14, 2013
Publication date	Nov 17, 2015
Grant date	Nov 17, 2015

Abstract

A dielectric ceramic composition includes: a base material powder Ba m TiO 3 (0.995≦m≦1.010); 0.2 to 2.0 moles of a first accessory ingredient, an oxide or carbide containing at least one of Ba and Ca, based on 100 moles of the base material powder; a second accessory ingredient, an oxide containing Si or a glass compound containing Si; 0.2 to 1.5 moles of a third accessory ingredient, an oxide containing at least one of Sc, Y, La, Ac, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu, based on 100 moles of the base material powder; and 0.05 to 0.80 mole of a fourth accessory ingredient, an oxide containing at least one of Cr, Mo, W, Mn, Fe, Co, and Ni, based on 100 moles of the base material powder, a content ratio of the first accessory ingredient to the second accessory ingredient being 0.5 to 1.7.

First claim

What is claimed is:

1. A dielectric ceramic composition comprising:
a base material powder represented by Ba m TiO 3 (0.995≦m≦0.998);
0.2 to 2.0 moles of a first accessory ingredient, an oxide or a carbide containing at least one of Ba and Ca, based on 100 moles of the base material powder;
a second accessory ingredient, an oxide containing Si or a glass compound containing Si;
0.2 to 1.5 moles of a third accessory ingredient, an oxide containing at least one of Sc, Y, La, Ac, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu, based on 100 moles of the base material powder; and
0.05 to 0.80 mole of a fourth accessory ingredient, an oxide containing at least one of Cr, Mo, W, Mn, Fe, Co, and Ni, based on 100 moles of the base material powder,
wherein a content ratio of the first accessory ingredient to the second accessory ingredient is 0.5 to 1.7, and
wherein the dielectric ceramic composition does not include an oxide containing magnesium.

2. The dielectric ceramic composition of claim 1 , wherein the base material powder has a specific surface area of 5.0m 2 /g or less.

3. The dielectric ceramic composition of claim 1 , wherein a content of the first accessory ingredient is 0.5 to 1.5 moles.

4. The dielectric ceramic composition of claim 1 , wherein the content ratio of the first accessory ingredient to the second accessory ingredient is 0.7 to 1.2.

5. The dielectric ceramic composition of claim 1 , wherein a content of the third accessory ingredient is 0.5 to 1.0 mole.

6. The dielectric ceramic composition of claim 1 , wherein a content of the fourth accessory ingredient is 0.1 to 0.4 mole.

7. The dielectric ceramic composition of claim 1 , further comprising 0.05 to 0.3 mole of vanadium (V) oxide, based on 100 moles of the base material powder.

8. The dielectric ceramic composition of claim 1 , further comprising 0.05 to 0.5 mole of aluminum (Al) oxide, based on 100 moles of the base material powder.

9. A multilayer ceramic capacitor comprising:
a ceramic body in which dielectric layers formed of a dielectric ceramic composition and first and second internal electrodes are alternately stacked; and
first and second external electrodes formed on both ends of the ceramic body and electrically connected to the first and second internal electrodes,
wherein the dielectric ceramic composition includes a ceramic composition including a base material powder represented by Ba m TiO 3 (0.995≦m≦0.998), 0.2 to 2.0 moles of a first accessory ingredient, an oxide or a carbide containing at least one of Ba and Ca, based on 100 moles of the base material powder, a second accessory ingredient, an oxide containing Si or a glass compound containing Si, 0.2 to 1.5 moles of a third accessory ingredient, an oxide containing at least one of Sc, Y, La, Ac, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu, based on 100 moles of the base material powder, and 0.05 to 0.80 mole of a fourth accessory ingredient, an oxide containing at least one of Cr, Mo, W, Mn, Fe, Co, and Ni, based on 100 moles of the base material powder, a content ratio of the first accessory ingredient to the second accessory ingredient being 0.5 to 1.7, and
wherein the dielectric ceramic composition does not include an oxide containing magnesium.

10. The multilayer ceramic capacitor of claim 9 , wherein the base material powder has a specific surface area of 5.0m 2 /g or less.

11. The multilayer ceramic capacitor of claim 9 , wherein a content of the first accessory ingredient is 0.5 to 1.5 moles.

12. The multilayer ceramic capacitor of claim 9 , wherein the content ratio of the first accessory ingredient to the second accessory ingredient is 0.7 to 1.2.

13. The multilayer ceramic capacitor of claim 9 , wherein a content of the third accessory ingredient is 0.5 to 1.0 mole.

14. The multilayer ceramic capacitor of claim 9 , wherein a content of the fourth accessory ingredient is 0.1 to 0.4 mole.

15. The multilayer ceramic capacitor of claim 9 , wherein the ceramic composition further includes 0.05 to 0.3 mole of vanadium (V) oxide, based on 100 moles of the base material powder.

16. The multilayer ceramic capacitor of claim 9 , wherein the ceramic composition further includes 0.05 to 0.5 mole of aluminum (Al) oxide, based on 100 moles of the base material powder.

Assignees

• Samsung Electro Mech

Inventors

• Kang Sung Hyung
• Choi Du Won
• Lee Ki Yong
• Choe Jae Hun
• Song Min Sung

Classifications

• H01G4/30

  Stacked capacitors (H01G4/33 takes precedence) · CPC title

• C04B2235/3239

  Vanadium oxides, vanadates or oxide forming salts thereof, e.g. magnesium vanadate · CPC title

• C04B2235/3224

  Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide · CPC title

• C04B2235/36

  Glass starting materials for making ceramics, e.g. silica glass · CPC title

• C04B2235/3418

  Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint · CPC title