Multilayer ceramic capacitor and manufacturing method of multilayer ceramic capacitor

Patent metadata

Field	Value
Publication number	US-10340084-B2
Application number	US-201715685978-A
Country	US
Kind code	B2
Filing date	Aug 24, 2017
Priority date	Sep 6, 2016
Publication date	Jul 2, 2019
Grant date	Jul 2, 2019

Abstract

A multilayer ceramic capacitor includes: a multilayer structure in which each of a plurality of ceramic dielectric layers and each of a plurality of internal electrode layers including a co-material are alternately stacked, wherein a Mo concentration in the co-material is smaller than that in a ceramic grain in the ceramic dielectric layer.

First claim

What is claimed is:

1. A multilayer ceramic capacitor comprising:
a multilayer structure in which each of a plurality of ceramic dielectric layers and each of a plurality of internal electrode layers including a co-material are alternately stacked,
wherein a Mo concentration in the co-material is smaller than that in a ceramic grain in the ceramic dielectric layer,
wherein a Mg concentration in the ceramic grain is smaller than that in the co-material.

2. The multilayer ceramic capacitor as claimed in claim 1 , wherein a Mo concentration in a main component ceramic in the ceramic grain is 0.2 atm % or more.

3. The multilayer ceramic capacitor as claimed in claim 1 , wherein the co-material does not include Mo.

4. The multilayer ceramic capacitor as claimed in claim 2 , wherein the co-material does not include Mo.

5. The multilayer ceramic capacitor as claimed in claim 1 , wherein a main component of the ceramic grain and the co-material is barium titanate.

6. The multilayer ceramic capacitor as claimed in claim 1 , wherein a main component of the internal electrode layer is Ni.

7. A manufacturing method of a multilayer ceramic capacitor comprising:
forming a green sheet by mixing ceramic particles and Mo compounds;
forming a multilayer structure by alternately stacking the green sheet and a conductive paste for forming an internal electrode including a co-material; and
baking the multilayer structure,
wherein an atomic concentration of Mo with respect to a main component ceramic of the ceramic particles in the green sheet is larger than an atomic concentration of Mo with respect to a main component ceramic in the co-material of the conductive paste for forming an internal electrode,
wherein an atomic concentration of Mg with respect to the main component ceramic in the co-material is larger than an atomic concentration of Mg with respect to the main component ceramic of the ceramic particles.

8. The method as claimed in claim 7 , wherein the atomic concentration of Mo with respect to the main component ceramic of the ceramic particles of the green sheet is 0.2 atm % or more.

9. The method as claimed in claim 7 , wherein the co-material does not include Mo.

10. The method as claimed in claim 8 , wherein the co-material does not include Mo.

11. The method as claimed in claim 7 , wherein a main component of the ceramic particles and the co-material is barium titanate.

12. The method as claimed in claim 7 , wherein a main component of the conductive paste for forming an internal electrode is Ni.

13. The multilayer ceramic capacitor as claimed in claim 1 , wherein a Mg concentration in a ceramic grain contacting one of the plurality of internal electrode layers is smaller than that in the co-material in the one of the plurality of internal electrode layers.

14. The method as claimed in claim 7 , wherein:
the baking is performed so that a dielectric ceramic layer is formed from the green sheet and an internal electrode layer is formed from the conductive paste; and
the baking is performed so that a Mg concentration in a ceramic grain contacting the internal electrode layer is smaller than in the co-material.

Assignees

• Taiyo Yuden Kk

Inventors

• Chigira Noriyuki

Classifications

• H01G4/1227 Primary

  based on alkaline earth titanates · CPC title

• H01G4/30 Primary

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

• H01G4/008

  Selection of materials · CPC title

• C04B35/465

  based on alkaline earth metal titanates · CPC title

• H01G4/129 Primary

  containing a glassy phase, e.g. glass ceramic · CPC title