Dielectric ceramic composition and multilayer ceramic capacitor containing the same

Patent metadata

Field	Value
Publication number	US-9255035-B2
Application number	US-201414340244-A
Country	US
Kind code	B2
Filing date	Jul 24, 2014
Priority date	Apr 21, 2014
Publication date	Feb 9, 2016
Grant date	Feb 9, 2016

Abstract

A dielectric ceramic composition may include: a base powder represented by BaTiO 3 and accessory components. In an XRD measurement of a dielectric material in which the base powder and the accessory components are sintered, when a (1, 1, 0) plane peak of a BaTiO 3 crystal phase is converted into 1.00, a secondary phase peak of pyrochlore (RE 2 Ti 2 O 7 ) (RE is a rare earth element) at about 30.5 degrees, as compared with the (1, 1, 0) plane peak, is 0.01 or less.

First claim

What is claimed is:

1. A dielectric ceramic composition comprising:
a base powder represented by BaTiO 3 and accessory components,
wherein in an XRD measurement of a dielectric material in which the base powder and the accessory components are sintered, when a (1,1,0) plane peak of a BaTiO 3 crystal phase is converted into 1.00, a secondary phase peak of pyrochlore (RE 2 Ti 2 O 7 ) (RE is a rare earth element) at about 30.5 degrees, as compared with the (1,1,0) plane peak, is less than 0.01.

2. The dielectric ceramic composition of claim 1 , wherein the dielectric ceramic composition contains 0.2 to 2.0 mol % of a first accessory component, an oxide or a carbonate containing at least one of Mn, V, Cr, Fe, Ni, Co, Cu and Zn, based on 100 mol % of the base powder.

3. The dielectric ceramic composition of claim 1 , wherein the dielectric ceramic composition contains 0.2 mol % or less of a second accessory component, an oxide or a carbonate containing a fixed-valence acceptor element, Mg, based on 100 mol % of the base powder.

4. The dielectric ceramic composition of claim 1 , wherein the dielectric ceramic composition contains 2.0 to 10.0 mol % of a third accessory component, an oxide or a carbonate containing at least one of Y, Dy, Ho, Er, Gd, Ce, Nd, Pm, Eu, Tb, Tm, Yb, Lu and Sm, based on 100 mol % of the base powder.

5. The dielectric ceramic composition of claim 1 , wherein the dielectric ceramic composition contains 1.0 to 10.0 mol % of a fourth accessory component, CaZrO 3 , based on 100 mol % of the base powder.

6. The dielectric ceramic composition of claim 1 , wherein the dielectric ceramic composition contains 0.25 to 6.0 mol % of a fifth accessory component, an oxide or a carbonate containing at least one of Ba and Ca, based on 100 mol % of the base powder.

7. The dielectric ceramic composition of claim 1 , wherein the dielectric ceramic composition contains 0.5 to 5.4 mol % of a sixth accessory component, an oxide containing Si or a glass compound containing Si, based on 100 mol % of the base powder.

8. The dielectric ceramic composition of claim 1 , wherein the dielectric ceramic composition contains 0.25 to 6.0 mol % of a fifth accessory component, an oxide or a carbonate containing Ba and Ca, and 0.5 to 5.4 mol % of a sixth accessory component, at least one of an oxide containing Si and a glass compound containing Si, based on 100 mol % of the base powder, and a content ratio of the fifth accessory component to the sixth accessory component satisfies 0.5≦(Ba+Ca)/Si≦1.2.

9. A multilayer ceramic capacitor comprising:
a ceramic body in which dielectric layers and first and second internal electrodes are alternately stacked; and
first and second external electrodes formed on both end portions of the ceramic body and electrically connected to the first and second internal electrodes, respectively,
wherein the dielectric layers contain a dielectric ceramic composition containing a base powder represented by BaTiO 3 and accessory components, and in an XRD measurement of a dielectric material in which the base powder and the accessory components are sintered, when a (1,1,0) plane peak of a BaTiO 3 crystal phase is converted into 1.00, a secondary phase peak of pyrochlore (RE 2 Ti 2 O 7 ) (RE is a rare earth element) at about 30.5 degrees, as compared with the (1,1,0) plane peak, is less than 0.01.

10. The multilayer ceramic capacitor of claim 9 , wherein the dielectric ceramic composition contains 0.2 to 2.0 mol % of a first accessory component, an oxide or a carbonate containing at least one of Mn, V, Cr, Fe, Ni, Co, Cu and Zn, based on 100 mol % of the base powder.

11. The multilayer ceramic capacitor of claim 9 , wherein the dielectric ceramic composition contains 0.2 mol % or less of a second accessory component, an oxide or a carbonate containing a fixed-valence acceptor element, Mg, based on 100 mol % of the base powder.

12. The multilayer ceramic capacitor of claim 9 , wherein the dielectric ceramic composition contains 2.0 to 10.0 mol % of a third accessory component, an oxide or a carbonate containing at least one of Y, Dy, Ho, Er, Gd, Ce, Nd, Pm, Eu, Tb, Tm, Yb, Lu and Sm, based on 100 mol % of the base powder.

13. The multilayer ceramic capacitor of claim 9 , wherein the dielectric ceramic composition contains 1.0 to 10.0 mol % of a fourth accessory component, CaZrO 3 , based on 100 mol % of the base powder.

14. The multilayer ceramic capacitor of claim 9 , wherein the dielectric ceramic composition contains 0.25 to 6.0 mol % of a fifth accessory component, an oxide or a carbonate containing at least one of Ba and Ca, based on 100 mol % of the base powder.

15. The multilayer ceramic capacitor of claim 9 , wherein the dielectric ceramic composition contains 0.5 to 5.4 mol % of a sixth accessory component, an oxide containing Si or a glass compound containing Si, based on 100 mol % of the base powder.

16. The multilayer ceramic capacitor of claim 9 , wherein the dielectric ceramic composition contains 0.25 to 6.0 mol % of a fifth accessory component, an oxide or a carbonate containing Ba and Ca, and 0.5 to 5.4 mol % of a sixth accessory component, at least one of an oxide containing Si and a glass compound containing Si, based on 100 mol % of the base powder, and a content ratio of the fifth accessory component to the sixth accessory component satisfies 0.5≦(Ba+Ca)/Si≦1.2.

Assignees

• Samsung Electro Mech

Inventors

• Yoon Seok Hyun
• Jeon Song Je
• Jo Soo Kyong
• Kim Doo Young
• Kim Chang Hoon

Classifications

• H01G4/30

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

• H01G4/1227

  based on alkaline earth titanates · CPC title

• C04B35/4682 Primary

  based on BaTiO3 perovskite phase · CPC title

• C04B2235/3234

  Titanates, not containing zirconia · CPC title

• C04B2235/3224

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