Multilayer ceramic capacitor and manufacturing method therefor

Patent metadata

Field	Value
Publication number	US-9978524-B2
Application number	US-201715488867-A
Country	US
Kind code	B2
Filing date	Apr 17, 2017
Priority date	Apr 28, 2016
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

A multilayer ceramic capacitor that includes a laminated body of multiple dielectric layers and internal electrodes laminated alternately therewith. The dielectric layers contain Ba, Sr, Ti, Ca, Zr, Mg, and R, where R represents at least one element of Y, La, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb. When Ti is 100 parts by mol, the dielectric layers contain Sr at 0.5 to 3.0 parts by mol; Ca at 3 to 15 parts by mol; Zr at 0.05 to 3.0 parts by mol; Mg at 0.01 to 0.09 parts by mol; and R at 2.5 to 8.4 parts by mol.

First claim

What is claimed is:

1. A multilayer ceramic capacitor comprising:
a laminated body having multiple dielectric layers and internal electrodes laminated alternately therewith, the dielectric layers containing Ba, Sr, Ti, Ca, Zr, Mg, and R,
wherein R represents at least one element of Y, La, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb, and
the dielectric layers containing, when Ti is 100 parts by mol:
Sr at 0.5 to 3.0 parts by mol;
Ca at 3 to 15 parts by mol;
Zr at 0.05 to 3.0 parts by mol;
Mg at 0.01 to 0.09 parts by mol; and
R at 2.5 to 3.4 parts by mol or less.

2. The multilayer ceramic capacitor according to claim 1 , wherein the laminated body has a length of 1.0 mm to 3.2 mm, a width of 0.5 mm to 2.5 mm, and a thickness of 0.5 mm to 2.5 mm.

3. The multilayer ceramic capacitor according to claim 1 , wherein each dielectric layer has a thickness of 0.4 μm to 3.0 μm.

4. The multilayer ceramic capacitor according to claim 1 , wherein R is 5.7 to 8.4 parts by mol.

5. A multilayer ceramic capacitor comprising:
a laminated body having multiple dielectric layers and internal electrodes laminated alternately therewith, the laminated body containing Ba, Sr, Ti, Ca, Zr, Mg, and R,
wherein R represents at least one element of Y, La, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb, and
the laminated body containing, when Ti is 100 parts by mol:
Sr at 0.5 to 3.0 parts by mol;
Ca at 3 to 15 parts by mol;
Zr at 0.05 to 3.0 parts by mol;
Mg at 0.01 0.09 parts by mol; and
R at 2.5 to 8.4 parts by mol.

6. The multilayer ceramic capacitor according to claim 5 , wherein the laminated body has a length of 1.0 mm to 3.2 mm, a width of 0.5 mm to 2.5 mm, and a thickness of 0.5 mm to 2.5 mm.

7. The multilayer ceramic capacitor according to claim 5 , wherein each dielectric layer has a thickness of 0.4 μm to 3.0 μm.

8. The multilayer ceramic capacitor according to claim 5 , wherein R is 5.7 to 8.4 parts by mol.

9. A multilayer ceramic capacitor comprising:
a laminated body of multiple dielectric layers and internal electrodes laminated alternately therewith, the laminated body containing Ba, Sr, Ti, Ca, Zr, Mg, and R,
wherein R represents at least one element of Y, La, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb, and when the laminated body is subjected to a dissolution treatment to provide a solution, when Ti in the solution is 100 parts by mol, the solution contains:
Sr at 0.5 to 3.0 parts by mol;
Ca at 3 to 15 parts by mol;
Zr at 0.05 to 3.0 parts by mol;
Mg at 0.01 to 0.09 parts by mol; and
R at 2.5 to 8.4 parts by mol.

10. The multilayer ceramic capacitor according to claim 9 , wherein the laminated body has a length of 1.0 mm to 3.2 mm, a width of 0.5 mm to 2.5 mm, and a thickness of 0.5 mm to 2.5 mm.

11. The multilayer ceramic capacitor according to claim 9 , wherein each dielectric layer has a thickness of 0.4 μm to 3.0 μm.

12. The multilayer ceramic capacitor according to claim 9 , wherein R is 5.7 to 8.4 parts by mol.

13. A method for manufacturing a multilayer ceramic capacitor, the method comprising:
alternately stacking ceramic green sheets for dielectric layers and electrode material layers for internal electrodes so as to form an unfired stacked body; and
firing the unfired stacked body to produce a fired laminated body,
wherein the ceramic green sheets for the dielectric layers contains Ba, Sr, Ti, Ca, Zr, Mg, and R,
where R represents at least one element of Y, La, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb, and
when Ti is 100 parts by mol:
Sr is 0.5 to 3.0 parts by mol;
Ca is 3 to 15 parts by mol;
Zr is 0.05 to 3.0 parts by mol;
Mg is 0.01 to 0.09 parts by mol; and
R is 2.5 to 8.4 parts by mol.

14. The method for manufacturing a multilayer ceramic capacitor according to claim 13 , wherein the fired laminated body has a length of 1.0 mm to 3.2 mm, a width of 0.5 mm to 2.5 mm, and a thickness of 0.5 mm to 2.5 mm.

15. The method for manufacturing a multilayer ceramic capacitor according to claim 13 , wherein each dielectric layer has a thickness of 0.4 μm to 3.0 μm.

16. The method for manufacturing a multilayer ceramic capacitor according to claim 13 , wherein R is 5.7 to 8.4 parts by mol.

Assignees

• Murata Manufacturing Co

Inventors

• Yamaguchi Shinichi

Classifications

• H01G4/30 Primary

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

• H01G4/1245

  containing also titanates · CPC title

• H01G4/1236

  based on zirconium oxides or zirconates (H01G4/1263 takes precedence) · CPC title

• H01G4/1227 Primary

  based on alkaline earth titanates · CPC title

• H01G4/1209

  characterised by the ceramic dielectric material (H01G4/1272, H01G4/1281 take precedence) · CPC title