Multilayer ceramic electronic component and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-9576729-B2
Application number	US-201514673100-A
Country	US
Kind code	B2
Filing date	Mar 30, 2015
Priority date	Oct 8, 2014
Publication date	Feb 21, 2017
Grant date	Feb 21, 2017

Abstract

There is provided a multilayer ceramic electronic component including: a ceramic body in which internal electrodes and dielectric layers containing a barium titanate-based compound containing calcium (Ca) are alternately stacked; and external electrodes disposed on outer surfaces of the ceramic body and electrically connected to the internal electrodes. The dielectric layer includes interfacial portions adjacent to the internal electrodes and a central portion disposed between the interfacial portions, the interfacial portion having a calcium (Ca) concentration higher than that of the central portion.

First claim

What is claimed is:

1. A multilayer ceramic electronic component comprising:
a ceramic body in which dielectric layers containing a barium titanate-based compound containing calcium (Ca) and internal electrodes are alternately stacked; and
external electrodes disposed on outer surfaces of the ceramic body and electrically connected to the internal electrodes,
wherein the dielectric layer includes interfacial portions adjacent to the internal electrodes and central portions disposed between the interfacial portions, the interfacial portions having a calcium (Ca) concentration higher than a calcium concentration of the central portions, and
the internal electrodes contain a ceramic additive containing calcium.

2. The multilayer ceramic electronic component of claim 1 , wherein the interfacial portions contain titanium and calcium, and a molar ratio of titanium and calcium contained in the interfacial portions is 100:1 or more to 100:20 or less.

3. The multilayer ceramic electronic component of claim 1 , wherein the central portion contains titanium and calcium, and a molar ratio of titanium and calcium contained in the central portion is more than 100:0 to 100:0.2 or less.

4. The multilayer ceramic electronic component of claim 1 , wherein the central portions do not contain calcium.

5. The multilayer ceramic electronic component of claim 1 , wherein a thickness of the interfacial portions is 20% of a thickness of the dielectric layers.

6. The multilayer ceramic electronic component of claim 1 , wherein dielectric grains contained in the interfacial portions have a core-shell structure, and shell portions of the dielectric grains contained in the interfacial portions have a calcium content higher than a calcium content of core portions.

7. The multilayer ceramic electronic component of claim 6 , wherein the shell portions of the dielectric grains of the interfacial portions contain a compound represented by Ba 1-x Ca x TiO 3 , x satisfying 0.01≦x≦0.2.

8. The multilayer ceramic electronic component of claim 1 , wherein the ceramic additive contains a compound represented by Ba 1-x Ca x TiO 3 , x satisfying 0.01≦x≦0.2.

9. The multilayer ceramic electronic component of claim 1 , wherein the ceramic additive contained in the internal electrodes has an average particle diameter of 1 to 200 nm.

10. A method of manufacturing a multilayer ceramic electronic component, the method comprising:
preparing ceramic green sheets containing barium titanate-based powder;
applying an internal electrode paste containing a ceramic additive containing calcium to the ceramic green sheets;
stacking the ceramic green sheets to which the internal electrode paste is applied; and
sintering the stacked ceramic green sheets to form a ceramic body including internal electrodes and dielectric layers,
wherein the dielectric layers include interfacial portions adjacent to the internal electrodes and central portions disposed between the interfacial portions, the interfacial portions having a calcium (Ca) concentration higher than a calcium concentration of the central portions.

11. The method of claim 10 , wherein the ceramic additive contains a compound represented by Ba 1-x Ca x TiO 3 , x satisfying 0.01≦x≦0.2.

12. The method of claim 10 , wherein the ceramic additive has an average particle diameter of 1 to 50 nm.

13. The method of claim 10 , wherein the interfacial portion contains titanium and calcium, and a molar ratio of titanium and calcium contained in the interfacial portion is 100:1 or more but 100:20 or less.

14. The method of claim 10 , wherein the central portions contain titanium and calcium, and a molar ratio of titanium and calcium contained in the central portions is more than 100:0 to 100:0.2 or less.

15. The method of claim 10 , wherein the central portions do not contain calcium.

16. The method of claim 10 , wherein a thickness of the interfacial portion is 20% of a thickness of the dielectric layer.

17. The method of claim 10 , wherein dielectric grains contained in the interfacial portions have a core-shell structure, and shell portions of the dielectric grains contained in the interfacial portions have a calcium content higher than a calcium content of core portions.

18. The method of claim 17 , wherein the shell portions of the dielectric grains contained in the interfacial portions contain a compound represented by Ba 1-x Ca x TiO 3 , x satisfying 0.01≦x≦0.2.

Assignees

• Samsung Electro Mech

Inventors

• Park Kum Jin
• Choi Chang Hak
• Lee Chi Hwa
• Yoo Jong Hoon
• Sin Min Gi

Classifications

• H01G4/008

  Selection of materials · CPC title

• H01G4/30

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

• H01G4/1227 Primary

  based on alkaline earth titanates · CPC title