Multilayer ceramic capacitor

Patent metadata

Field	Value
Publication number	US-11776747-B2
Application number	US-202217748273-A
Country	US
Kind code	B2
Filing date	May 19, 2022
Priority date	Dec 7, 2017
Publication date	Oct 3, 2023
Grant date	Oct 3, 2023

Abstract

A multilayer ceramic capacitor include: a ceramic body including first and second surfaces opposing each other and third and fourth surfaces connecting the first and second surfaces; a plurality of internal electrodes disposed inside the ceramic body and exposed to the first and second surfaces, the plurality internal electrodes each having one end exposed to the third or fourth surface; and first and second side margin portions disposed on sides of the internal electrodes exposed to the first and second surfaces. A dielectric composition of the first and second side margin portions is different from a dielectric composition of the ceramic body, and a dielectric constant of the first and second side margin portions is lower than a dielectric constant of the ceramic body.

First claim

What is claimed is:

1. A multilayer ceramic capacitor comprising:
a ceramic body including first and second surfaces opposing each other and third and fourth surfaces connecting the first and second surfaces;
a plurality of internal electrodes disposed inside the ceramic body and exposed to the first and second surfaces, the plurality of internal electrodes each having one end exposed to the third or fourth surface; and
first and second side margin portions disposed on sides of the internal electrodes exposed to the first and second surfaces, such that interfaces are defined between the first and second side margin portions and the first and second surfaces, respectively,
wherein the first and second side margin portions and the ceramic body include a base material main component including barium (Ba) and titanium (Ti) and a subcomponent, and
wherein the first and second side margin portions comprise at least one of sodium (Na) or lithium (Li) as a subcomponent.

2. The multilayer ceramic capacitor of claim 1 , wherein a dielectric composition of the first and second side margin portions is different from a dielectric composition of the ceramic body.

3. The multilayer ceramic capacitor of claim 1 , wherein the first and second side margin portions and the ceramic body comprise a first subcomponent including at least one of manganese (Mn), vanadium (V), chromium (Cr), iron (Fe), nickel (Ni), cobalt (Co), copper (Cu), or zinc (Zn) as a subcomponent.

4. The multilayer ceramic capacitor of claim 3 , wherein a content of manganese (Mn) included in the first and second side margin portions is higher than a content of manganese (Mn) included in the ceramic body.

5. The multilayer ceramic capacitor of claim 1 , wherein a dielectric constant of the first and second side margin portions is lower than a dielectric constant of the ceramic body.

6. The multilayer ceramic capacitor of claim 1 , wherein the first and second side margin portions and the ceramic body comprise a second subcomponent including at least one of barium (Ba) or calcium (Ca) as a subcomponent.

7. The multilayer ceramic capacitor of claim 1 , wherein the first and second side margin portions and the ceramic body comprise a third subcomponent including silicon (Si)-containing oxide or carbonate or a silicon (Si)-containing glass component as a subcomponent.

8. The multilayer ceramic capacitor of claim 7 , wherein the content of silicon (Si) included in the first and second side margin portions is higher than the content of silicon (Si) included in the ceramic body.

9. The multilayer ceramic capacitor of claim 1 , wherein the first and second side margin portions and the ceramic body include a fourth subcomponent including at least one of yttrium (Y), dysprosium (Dy), holmium (Ho), erbium (Er), gadolinium (Gd), cerium (Ce), neodymium (Nd), samarium (Sm), lanthanum (La), terbium (Tb), ytterbium (Yb), or praseodymium (Pr) as a subcomponent and a fifth subcomponent including magnesium (Mg) or aluminum (Al) as a subcomponent.

10. The multilayer ceramic capacitor of claim 1 , wherein the content of at least one of Na and Li included in the first and second side margin portions is higher than the content of at least one of Na and Li included in the ceramic body.

11. A multilayer ceramic capacitor comprising:
a ceramic body including first and second surfaces opposing each other and third and fourth surfaces connecting the first and second surfaces;
plurality of internal electrodes disposed inside the ceramic body and exposed to the first and second surfaces, the plurality of internal electrodes each having one end exposed to the third or fourth surface; and
first and second side margin portions disposed on sides of the internal electrodes exposed to the first and second surfaces, such that interfaces are defined between the first and second side margin portions and the first and second surfaces, respectively,
wherein the first and second side margin portions and the ceramic body include a base material main component including barium (Ba) and titanium (Ti) and a subcomponent,
wherein the first and second side margin portions and the ceramic body include Mn, and
wherein the first and second side margin portions comprise at least one of sodium (Na) or lithium (Li) as a subcomponent.

12. The multilayer ceramic capacitor of claim 11 , wherein the first and second side margin portions and the ceramic body include a first subcomponent including at least one of manganese (Mn), vanadium (V), chromium (Cr), iron (Fe), nickel (Ni), cobalt (Co), copper (Cu), or zinc (Zn) as a subcomponent.

13. The multilayer ceramic capacitor of claim 11 , wherein the content of Mn included in the first and second side margin portions is higher than the content of Mn included in the ceramic body.

14. The multilayer ceramic capacitor of claim 11 , wherein
the first and second side margin portions and the ceramic body include a second subcomponent including at least one of barium (Ba) or calcium (Ca) as a subcomponent, a third subcomponent including a silicon (Si)-containing oxide or carbonate or a silicon (Si)-containing glass component as a subcomponent, a fourth subcomponent including at least one of yttrium (Y), dysprosium (Dy), holmium (Ho), erbium (Er), gadolinium (Gd), cerium (Ce), neodymium (Nd), samarium (Sm), lanthanum (La), terbium (Tb), ytterbium (Yb), or praseodymium (Pr) as a subcomponent, and a fifth subcomponent including magnesium (Mg) or aluminum (Al) as a subcomponent.

15. The multilayer ceramic capacitor of claim 14 , wherein the content of silicon (Si) included in the first and second side margin portions is higher than the content of silicon (Si) included in the ceramic body.

16. The multilayer ceramic capacitor of claim 11 , wherein the content of at least one of Na or Li included in the first and second side margin portions is higher than the content of at least one of Na or Li included in the ceramic body.

17. The multilayer ceramic capacitor of claim 11 , wherein a thickness of the first and second side margin portions is less than or equal to 18 micrometers (μm).

Assignees

• Samsung Electro Mech

Inventors

• Cha Berm Ha
• Jo Soo Kyong
• Kim Hwi Dae
• Lee Jong Ho

Classifications

• H01G4/1218 Primary

  based on titanium oxides or titanates (H01G4/1245 takes precedence) · CPC title

• H01G2/065

  for surface mounting, e.g. chip capacitors · CPC title

• H01G4/005

  Electrodes · CPC title

• H01G4/1272

  Semiconductive ceramic capacitors · CPC title

• H01G4/228

  Terminals · CPC title