Dielectric composition and multilayer capacitor

Patent metadata

Field	Value
Publication number	US-2022181081-A1
Application number	US-202117474510-A
Country	US
Kind code	A1
Filing date	Sep 14, 2021
Priority date	Dec 7, 2020
Publication date	Jun 9, 2022
Grant date	—

Abstract

A dielectric composition and a multilayer capacitor including the same are provided. The dielectric composition includes a BaTiO3-base main component, a first subcomponent including an Nb component and a Gd component, a second subcomponent including an Mg component, and a third subcomponent including a Ba component and a Ca component. The first subcomponent is included in an amount of 4 moles or less per 100 moles of the main component. In the first subcomponent, a molar content of Nb and a molar content of Gd satisfy 0.33≤Nb/Gd, and in the third subcomponent, a molar content of Ba and a molar content of Ca satisfy 0.2≤Ca/(Ba+Ca).

First claim

What is claimed is:

1 . A dielectric composition comprising:
a BaTiO 3 -base main component; a first subcomponent including a niobium (Nb) component and a gadolinium (Gd) component; a second subcomponent including a magnesium (Mg) component; and a third subcomponent including a barium (Ba) component and a calcium (Ca) component, wherein the dielectric composition comprises the first subcomponent in an amount of 4 moles or less per 100 moles of the main component, in the first subcomponent, a molar content of Nb and a molar content of Gd satisfy 0.33≤Nb/Gd, and in the third subcomponent, a molar content of Ba and a molar content of Ca satisfy 0.2≤Ca/(Ba+Ca).

2 . The dielectric composition of claim 1 , wherein in the second and third subcomponents, a molar content of Mg and the molar contents of Ba and Ca satisfy 0.2≤Mg/(Ba+Ca)<0.6.

3 . The dielectric composition of claim 1 , wherein in the second subcomponent, a molar content of Mg, per 100 moles of the main component, satisfies 0.5≤Mg≤1.5.

4 . The dielectric composition of claim 2 , wherein in the second subcomponent, the molar content of Mg, per 100 moles of the main component, satisfies 0.5≤Mg≤1.5.

5 . The dielectric composition of claim 1 , wherein a sum of the molar contents of Nb and Gd of the first subcomponent,
per 100 moles of the main component, is 4 moles or less.

6 . The dielectric composition of claim 1 , wherein the molar content of Nb and the molar content of Gd in the first subcomponent satisfies 2<Nb/Gd.

7 . A multilayer capacitor comprising:
a body and an external electrode disposed outside of the body, wherein the body includes a laminate including a plurality of dielectric layers and a plurality of internal electrodes stacked with the dielectric layer interposed therebetween, and a side margin portion covering at least one side of side surfaces of the laminate to which the plurality of internal electrodes are exposed, and the side margin portion includes a dielectric comprising: a BaTiO 3 -base main component: a first subcomponent including niobium (Nb) and gadolinium (Gd) components; a second subcomponent including an Mg component; and a third subcomponent including a barium (Ba) component and a calcium (Ca) component, wherein the dielectric comprises the first subcomponent in an amount of 4 moles or less per 100 moles of the main component, a molar content of Nb and a molar content of Gd in the first subcomponent satisfy 0.33≤Nb/Gd, and a molar content of Ba and a molar content of Ca in the third subcomponent satisfy 0.2≤Ca/(Ba+Ca).

8 . The multilayer capacitor of claim 7 , wherein the plurality of dielectric layers include a dielectric comprising: a BaTiO 3 -base main component; a first subcomponent including Nb and Gd components; a second subcomponent including an Mg component; and a third subcomponent including Ba and Ca components,
wherein the dielectric composition comprises the first subcomponent in an amount of 4 moles or less per 100 moles of the main component, the molar content of Nb and the molar content of Gd in the first subcomponent satisfy 0.33≤Nb/Gd, and the molar content of Ba and the molar content of Ca in the third subcomponent satisfy 0.2≤Ca/(Ba+Ca).

9 . The multilayer capacitor of claim 7 , wherein the dielectric of the plurality of dielectric layers and the dielectric of the side margin portion have different compositions.

10 . The multilayer capacitor of claim 7 , wherein in the second and third subcomponents, a molar content of Mg and molar contents of Ba and Ca satisfy 0.2≤Mg/(Ba+Ca)<0.6.

11 . The multilayer capacitor of claim 7 , wherein in the second subcomponent, a molar content of Mg, per 100 moles of the main component, satisfies 0.5≤Mg≤1.5.

12 . The multilayer capacitor of claim 10 , wherein in the second subcomponent, the molar content of Mg, per 100 moles of the main component, satisfies 0.5≤Mg≤1.5.

13 . The multilayer capacitor of claim 7 , wherein a sum of the molar contents of Nb and Gd of the first subcomponent, per 100 moles of the main component, is 4 moles or less.

14 . The multilayer capacitor of claim 7 , wherein the molar content of Nb and the molar content of Gd in the first subcomponent satisfy 2<Nb/Gd.

Assignees

• Samsung Electro Mech

Inventors

• Park Jae Sung
• Park Jeong Yun
• Kim Hyoung Uk
• Kim Jong Han
• Lee Chung Eun

Classifications

• H01G4/06 Primary

  Solid dielectrics · CPC title

• H01G4/30

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

• H01G4/12

  Ceramic dielectrics {(H01G4/085 takes precedence)} · CPC title

• C04B2235/5454

  nanometer sized, i.e. below 100 nm · CPC title

• C04B35/4682

  based on BaTiO3 perovskite phase · CPC title