Multilayer ceramic capacitor

Patent metadata

Field	Value
Publication number	US-10056191-B2
Application number	US-201715456368-A
Country	US
Kind code	B2
Filing date	Mar 10, 2017
Priority date	Jun 20, 2016
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

A multilayer ceramic capacitor includes: a pair of external electrodes; a first internal electrode that is coupled to one of the pair of external electrodes; a dielectric layer that is stacked on the first internal electrode and contains BaTiO 3 and Ni; and a second internal electrode that is stacked on the dielectric layer, contains Ni, and is coupled to another one of the pair of external electrodes, wherein Ni concentrations obtained by analyzing five regions with a transmission electron microscope are within a range from 0.015 to 0.045, the five regions being obtained by dividing a region from a location 50 nm away from the first internal electrode of the dielectric layer to a location 50 nm away from the second internal electrode of the dielectric layer in a stacking direction between the first internal electrode and the second internal electrode equally into five.

First claim

What is claimed is:

1. A multilayer ceramic capacitor comprising:
a pair of external electrodes;
a first internal electrode that is coupled to one of the pair of external electrodes;
a dielectric layer that is stacked on the first internal electrode and contains BaTiO 3 and Ni; and
a second internal electrode that is stacked on the dielectric layer, contains Ni, and is coupled to another one of the pair of external electrodes, wherein
Ni concentrations obtained by analyzing five regions with a transmission electron microscope are within a range from 0.015 to 0.045, the five regions being obtained by dividing a region of the dielectric layer equally into five in a stacking direction, the region of the dielectric layer being located from a location 50 nm away from the first internal electrode to a location 50 nm away from the second internal electrode in the stacking direction between the first internal electrode and the second internal electrode, and
the Ni concentrations are atomic concentration ratios Ni/(Ba+Ti).

2. The multilayer ceramic capacitor according to claim 1 ,
a Ni concentration in at least one of end regions located closest to the first internal electrode and the second internal electrode among the five regions is greater than a Ni concentration in a central region of the five regions by 10% or more.

3. The multilayer ceramic capacitor according to claim 1 , wherein
a Ni concentration in at least one of end regions located closest to the first internal electrode and the second internal electrode among the five regions is greater than a Ni concentration in a central region of the five regions by 15% or more.

4. The multilayer ceramic capacitor according to claim 1 , wherein
a number of the dielectric layers stacked is 200 or greater.

5. The multilayer ceramic capacitor according to claim 1 , wherein
a plurality of dielectric layers are stacked across an internal electrode, and
80% or more of the plurality of dielectric layers are the dielectric layer.

Assignees

• Taiyo Yuden Kk

Inventors

• Ryu Minoru
• Taniguchi Katsuya
• Morita Koichiro
• Iwazaki Yoshiki

Classifications

• H01G4/012 Primary

  Form of non-self-supporting electrodes · CPC title

• H01G4/30 Primary

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

• H01G4/1227

  based on alkaline earth titanates · CPC title

• H01G4/2325

  characterised by the material of the terminals · CPC title

• H01G4/232

  electrically connecting two or more layers of a stacked or rolled capacitor · CPC title