Dielectric powder and multilayer capacitor using the same

Patent metadata

Field	Value
Publication number	US-10903013-B2
Application number	US-202016782586-A
Country	US
Kind code	B2
Filing date	Feb 5, 2020
Priority date	Dec 28, 2016
Publication date	Jan 26, 2021
Grant date	Jan 26, 2021

Abstract

A dielectric powder includes a core-shell structure including a core region formed in an inner portion thereof and a shell region covering the core region. The core region includes barium titanate (BaTiO 3 ) doped with a metal oxide, and the shell region is formed of a ferroelectric material.

First claim

What is claimed is:

1. A dielectric powder comprising a core-shell structure including a core region formed in an inner portion thereof and a shell region covering the core region,
wherein the core region includes barium titanate (BaTiO 3 ) doped with a metal oxide, and
the shell region is formed of a ferroelectric material, and
wherein the metal oxide comprises at least one selected from the group consisting of Dy, Ce, Al, La, Bi and Cu.

2. The dielectric powder of claim 1 , further comprising:
a coating layer including a heterogeneous element and covering a surface of the shell region,
wherein the heterogeneous element includes at least one of Sr, Sn, Dy, Mg, Mn, Na, and Si.

3. The dielectric powder of claim 2 , wherein the coating layer has a thickness within a range of 1 to 2 nm.

4. The dielectric powder of claim 1 , wherein the core region has a diameter larger than a thickness of the shell region.

5. The dielectric powder of claim 1 , wherein the core region has a diameter of 60 nm or less, and the shell region has a thickness within a range of 10 to 40 nm.

6. The dielectric powder of claim 1 , wherein a total diameter of the core region and the shell region is 100 nm or less.

7. The dielectric powder of claim 1 , wherein the core region is formed by grain growth of the barium titanate (BaTiO 3 ) doped with the metal oxide.

8. A multilayer capacitor comprising:
a body including a plurality of dielectric layers and first and second internal electrodes alternately disposed with the dielectric layer interposed therebetween; and
first and second external electrodes disposed to be electrically connected to exposed portions of the first and second internal electrodes in the body, respectively;
wherein the dielectric layer includes a dielectric having a core-shell structure including a core region formed in an inner portion thereof and a shell region covering the core region,
the core region includes barium titanate (BaTiO 3 ) doped with a metal oxide,
the shell region is formed of a ferroelectric material, and
wherein the metal oxide comprises at least one selected from the group consisting of Dy, Ce, Al, La, Bi and Cu.

9. The multilayer capacitor of claim 8 , wherein the dielectric further includes a coating layer including a heterogeneous element and covering a surface of the shell region, and the heterogeneous element includes at least one of Sr, Sn, Dy, Mg, Mn, Na, and Si.

10. The multilayer capacitor of claim 8 , wherein, in the dielectric, the core region has a diameter larger than a thickness of the shell region.

11. The multilayer capacitor of claim 8 , wherein, in the dielectric, the core region has a diameter of 60 nm or less, and the shell region has a thickness within a range of 10 to 40 nm.

12. The multilayer capacitor of claim 8 , wherein in the dielectric, a total diameter of the core region and the shell region is 100 nm or less.

13. A multilayer capacitor comprising:
a body including a plurality of dielectric layers and first and second internal electrodes alternately disposed with the dielectric layer interposed therebetween; and
first and second external electrodes disposed to be electrically connected to exposed portions of the first and second internal electrodes in the body, respectively;
wherein the dielectric layer includes a dielectric grain having a core-shell structure including a core region formed in an inner portion thereof and a shell region covering the core region,
the core region includes barium titanate (BaTiO 3 ) doped with a metal oxide,
the shell region is formed of a ferroelectric material,
wherein the metal oxide comprises at least one selected from the group consisting of Dy, Ce, Al, La, Bi and Cu.

14. The multilayer capacitor of claim 13 , wherein the dielectric grain further includes a coating layer including a heterogeneous element and covering a surface of the shell region, and the heterogeneous element includes at least one of Sr, Sn, Dy, Mg, Mn, Na, and Si.

15. The multilayer capacitor of claim 13 , wherein, in the dielectric grain, the core region has a diameter larger than a thickness of the shell region.

16. The multilayer capacitor of claim 13 , wherein, in the dielectric grain, the core region has a diameter of 60 nm or less, and the shell region has a thickness within a range of 10 to 40 nm.

17. The multilayer capacitor of claim 13 , wherein in the dielectric grain, a total diameter of the core region and the shell region is 100 nm or less.

Assignees

• Samsung Electro Mech

Inventors

• Park Chang Hwa
• Kim Jin Woo
• Sin Min Gi
• Park Byung Hyun
• Kim Chin Mo

Classifications

• H10P14/69394

  the material containing titanium, e.g. TiO2 · CPC title

• H10W74/43

  comprising oxides, nitrides or carbides, e.g. ceramics or glasses · CPC title

• H10D1/68

  Capacitors having no potential barriers · CPC title

• C01F11/02

  Oxides or hydroxides (production of lime C04B2/00) · CPC title

• C01G23/006

  Alkaline earth titanates · CPC title