Dielectric ceramic composition and multilayer ceramic capacitor comprising the same

Patent metadata

Field	Value
Publication number	US-2023411075-A1
Application number	US-202318237256-A
Country	US
Kind code	A1
Filing date	Aug 23, 2023
Priority date	Jun 14, 2019
Publication date	Dec 21, 2023
Grant date	—

Abstract

A dielectric ceramic composition and a multilayer ceramic capacitor including the same are provided. The dielectric ceramic composition includes a BaTiO 3 -based base material main ingredient and an accessory ingredient, where the accessory ingredient includes dysprosium (Dy) and niobium (Nb) as first accessory ingredients. A total content of the Dy and Nb is greater than 0.2 mol and less than or equal to 1.5 mol based on 100 mol of titanium (Ti) of the base material main ingredient.

First claim

What is claimed is:

1 . A multilayer ceramic capacitor, comprising:
a ceramic body comprising dielectric layers and first and second internal electrodes disposed to face each other with respective dielectric layers interposed therebetween; and a first external electrode and a second external electrode disposed on external surfaces of the ceramic body, the first external electrode being connected to the first internal electrode and the second external electrode being connected to the second internal electrode, wherein the dielectric layers comprise dielectric grains comprising a dielectric ceramic composition, the dielectric ceramic composition comprises a barium titanate (BaTiO3)-based base material main ingredient and an accessory ingredient, the accessory ingredient comprising dysprosium (Dy) and niobium (Nb) as first accessory ingredients, wherein a total content of the Dy and Nb is greater than 0.2 mol based on 100 mol of titanium (Ti) of the barium titanate-based base material main ingredient, and wherein a thickness of at least one of the dielectric layers is 0.4 μm or less and a thickness of each of the first and second internal electrodes is 0.4 μm or less.

2 . The multilayer ceramic capacitor of claim 1 , wherein a content of the Nb satisfies 0.05 mol≤Nb≤0.20 mol based on 100 mol of Ti of the barium titanate base material main ingredient.

3 . The multilayer ceramic capacitor of claim 1 , wherein the dielectric ceramic composition comprises 0.1 mol to 2.0 mol, inclusive, of a second accessory ingredient based on 100 mol of the barium titanate base material main ingredient,
wherein the second accessory ingredient comprises one or more oxides comprising at least one element selected from the group consisting of manganese (Mn), vanadium (V), chromium (Cr), iron (Fe), nickel (Ni), cobalt (Co), copper (Cu) and zinc (Zn) and/or one or more carbonates comprising at least one element selected from the group consisting of Mn, V, Cr, Fe, Ni, Co, Cu and Zn.

4 . The multilayer ceramic capacitor of claim 1 , wherein the dielectric ceramic composition comprises 0.2 mol to 0.7 mol, inclusive, of a third accessory ingredient based on 100 mol of Ti of the barium titanate base material main ingredient,
wherein the third accessory ingredient is an oxide or carbonate comprising a fixed-valence acceptor element of magnesium (Mg).

5 . The multilayer ceramic capacitor of claim 1 , wherein the dielectric ceramic composition comprises 0.001 mol to 0.5 mol of a fourth accessory ingredient based on 100 mol of the barium titanate base material main ingredient,
wherein the fourth accessory ingredient comprises one or more oxides comprising at least one element of silicon (Si) or aluminum (Al), or a glass compound comprising Si.

6 . The multilayer ceramic capacitor of claim 1 , wherein a size of the multilayer ceramic capacitor is 1005 (length×width, 1.0 mm×0.5 mm) or less.

7 . The multilayer ceramic capacitor of claim 1 , wherein Nb is disposed at a boundary of the dielectric grain.

8 . A multilayer ceramic capacitor, comprising:
a ceramic body comprising dielectric layers and first and second internal electrodes disposed to face each other with respective dielectric layers interposed therebetween; and a first external electrode and a second external electrode disposed on external surfaces of the ceramic body, the first external electrode being connected to the first internal electrode and the second external electrode being connected to the second internal electrode, wherein the dielectric layers comprise dielectric grains comprising a dielectric ceramic composition, the dielectric ceramic composition comprises a barium titanate (BaTiO3)-based base material main ingredient and an accessory ingredient, the accessory ingredient comprising dysprosium (Dy) and niobium (Nb) as first accessory ingredients, wherein a total content of the Dy and Nb is less than 1.5 mol based on 100 mol of titanium (Ti) of the barium titanate-based base material main ingredient, and wherein a thickness of at least one of the dielectric layers is 0.4 μm or less and a thickness of each of the first and second internal electrodes is 0.4 μm or less.

9 . The multilayer ceramic capacitor of claim 8 , wherein a content of the Nb satisfies 0.05 mol≤Nb≤0.20 mol based on 100 mol of Ti of the barium titanate base material main ingredient.

10 . The multilayer ceramic capacitor of claim 8 , wherein the dielectric ceramic composition comprises 0.1 mol to 2.0 mol, inclusive, of a second accessory ingredient based on 100 mol of the barium titanate base material main ingredient,
wherein the second accessory ingredient comprises one or more oxides comprising at least one element selected from the group consisting of manganese (Mn), vanadium (V), chromium (Cr), iron (Fe), nickel (Ni), cobalt (Co), copper (Cu) and zinc (Zn) and/or one or more carbonates comprising at least one element selected from the group consisting of Mn, V, Cr, Fe, Ni, Co, Cu and Zn.

11 . The multilayer ceramic capacitor of claim 8 , wherein the dielectric ceramic composition comprises 0.2 mol to 0.7 mol, inclusive, of a third accessory ingredient based on 100 mol of Ti of the barium titanate base material main ingredient,
wherein the third accessory ingredient is an oxide or carbonate comprising a fixed-valence acceptor element of magnesium (Mg).

12 . The multilayer ceramic capacitor of claim 8 , wherein the dielectric ceramic composition comprises 0.001 mol to 0.5 mol of a fourth accessory ingredient based on 100 mol of the barium titanate base material main ingredient,
wherein the fourth accessory ingredient comprises one or more oxides comprising at least one element of silicon (Si) or aluminum (Al), or a glass compound comprising Si.

13 . The multilayer ceramic capacitor of claim 8 , wherein a size of the multilayer ceramic capacitor is 1005 (length×width, 1.0 mm×0.5 mm) or less.

14 . The multilayer ceramic capacitor of claim 8 , wherein Nb is disposed at a boundary of the dielectric grain.

Assignees

• Samsung Electro Mech

Inventors

• Kim Hyoung Uk
• Baik Seung In
• Kwon Hyung Soon
• Jo Ji Hong

Classifications

• H01G4/1227 Primary

  based on alkaline earth titanates · CPC title

• H01G4/012 Primary

  Form of non-self-supporting electrodes · CPC title

• C04B35/4682

  based on BaTiO3 perovskite phase · CPC title

• H01G4/30

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

• H01G4/248

  the terminals embracing or surrounding the capacitive element, e.g. caps (H01G4/252 takes precedence) · CPC title