Multilayer ceramic electronic component

Patent metadata

Field	Value
Publication number	US-10892098-B2
Application number	US-201916281773-A
Country	US
Kind code	B2
Filing date	Feb 21, 2019
Priority date	Mar 27, 2018
Publication date	Jan 12, 2021
Grant date	Jan 12, 2021

Abstract

A multilayer ceramic electronic component includes an element body in which dielectric layers and internal electrode layers having different polarities are laminated alternately. The dielectric layers contain a main component of a perovskite-type compound represented by (Ba 1-a-b Sr a Ca b ) m (Ti 1-c-d Zr c Hf d )O 3 . 0.94<m<1.1, 0≤a≤1, 0≤b≤1, 0≤c≤1, and 0≤d≤1 are satisfied. The dielectric layers contain a first sub-component of 2.5 mol or more to the main component of 100 mol. The first sub-component contains a boron oxide and/or a lithium oxide. The internal electrode layers contain a main component of copper and/or silver.

First claim

What is claimed is:

1. A multilayer ceramic electronic component comprising an element body in which dielectric layers and internal electrode layers having different polarities are laminated alternately, wherein
the dielectric layers contain a main component of a perovskite-type compound represented by (Ba 1-a-b Sr a Ca b ) m (Ti 1-c-d Zr c Hf d )O 3 ,
0.94<m<1.1, 0≤a≤1, 0≤b≤1, 0≤c≤1, and 0≤d≤1 are satisfied,
the dielectric layers contain a first sub-component of 2.5 mol or more to the main component of 100 mol, a second sub-component of 0.2 to 1 mol to the main component of 100 mol, and a third sub-component of 0.1 to 2 mol to the main component of 100 mol,
the first sub-component contains a boron oxide and optionally a lithium oxide, and
the second sub-component contains an oxide of Mn and/or Cr,
the third sub-component is an oxide of a rare earth element R,
the R is at least one of Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu,
the internal electrode layers contain a main component of copper and/or silver,
the boron oxide of the first sub-component is present in an amount of 2.5 mol or more to the main component of 100 mol, and
and a content ratio Bs/Bc is 0.5 to 0.95, in which an amount of boron contained in the dielectric layers located near the outer surface of the element body is Bs and an amount of boron contained in the dielectric layers located at a central portion of the element body is Bc.

2. The multilayer ceramic electronic component according to claim 1 , wherein
the dielectric layers contain a fourth sub-component, and
the fourth sub-component is an oxide of Mg.

3. The multilayer ceramic electronic component according to claim 1 , wherein the first sub-component is present in an amount of 2.5 to 20 mol to the main component of 100 mol.

4. The multilayer ceramic electronic component according to claim 1 , wherein the first sub-component is present in an amount of 2.5 to 10 mol to the main component of 100 mol.

5. The multilayer ceramic electronic component according to claim 1 , wherein the first sub-component is boron oxide.

6. The multilayer ceramic electronic component according to claim 1 , wherein a proportion of copper, silver, or a copper-silver alloy contained in the internal electrode layers is 80 wt % or more.

Assignees

• Tdk Corp

Inventors

• Iguchi Toshihiro

Classifications

• H01G4/1227 Primary

  based on alkaline earth titanates · CPC title

• H01G4/30

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

• H01G4/012

  Form of non-self-supporting electrodes · CPC title

• H01G4/255 Primary

  Means for correcting the capacitance value · CPC title

• H01G4/0085

  Fried electrodes · CPC title