Dielectric ceramic composition and multilayer ceramic capacitor including the same

Patent metadata

Field	Value
Publication number	US-9458063-B2
Application number	US-201414507411-A
Country	US
Kind code	B2
Filing date	Oct 6, 2014
Priority date	Jul 7, 2014
Publication date	Oct 4, 2016
Grant date	Oct 4, 2016

Abstract

A dielectric ceramic composition may include a base material main ingredient and an accessory ingredient. The accessory ingredient contains one or more selected from a group consisting of oxides and carbonates of one or more elements among Bi, Li, and Cu. When the accessory ingredient contains Bi, a content of Bi may be 0.1 to 1.0 part by mole, based on 100 parts by mole of the base material main ingredient, when the accessory ingredient contains Li, a content of Li may be 0.1 to 1.0 part by mole, based on 100 parts by mole of the base material main ingredient, and when the accessory ingredient contains Cu, a content of Cu may be 0.1 to 1.0 part by mole, based on 100 parts by mole of the base material main ingredient.

First claim

What is claimed is:

1. A dielectric ceramic composition comprising a base material main ingredient and an accessory ingredient,
wherein the accessory ingredient contains one or more selected from a group consisting of oxides and carbonates of one or more elements among Bi and Li, and
when the accessory ingredient contains Bi, a content of Bi is 0.1 to 0.5 part by mole, based on 100 parts by mole of the base material main ingredient, and
when the accessory ingredient contains Li, a content of Li is 0.1 to 0.5 part by mole, based on 100 parts by mole of the base material main ingredient,
wherein the accessory ingredient further comprises a first accessory ingredient containing one or more selected from a group consisting of oxides and carbonates of one or more variable-valence acceptor elements among Mn, V, Cr, Fe, Ni, Co, Cu, and Zn,
a sum of contents of one or more variable-valence acceptor elements among Mn, V, Cr, Fe, Ni, Co, Cu, and Zn contained in the first accessory ingredient being 0.1 to 2.0 parts by mole, based on 100 parts by mole of the base material main ingredient.

2. The dielectric ceramic composition of claim 1 , wherein the base material main ingredient comprises one or more selected from a group consisting of BaTiO 3 , (Ba 1-x Ca x )(Ti 1-y Ca y )O 3 (0≦x≦0.3 and 0≦y≦0.1), (Ba 1-x Ca x )(Ti 1-y Zr y )O 3 (0≦x≦0.3 and 0≦y≦0.5), and Ba(Ti 1-y Zr y ) O 3 (0≦y≦0.5).

3. The dielectric ceramic composition of claim 1 , wherein the accessory ingredient further comprises a second accessory ingredient containing one or more of oxides and carbonates of fixed-valence acceptor elements,
a content of the fixed-valence acceptor elements contained in the second accessory ingredient being 2.0 parts by mole or less, based on 100 parts by mole of the base material main ingredient.

4. The dielectric ceramic composition of claim 1 , wherein the accessory ingredient further comprises a third accessory ingredient containing one or more selected from a group consisting of oxides and carbonates of one or more elements among Y, Dy, Ho, Er, Gd, Ce, Nd, Pm, Eu, Tb, Tm, Yb, Lu, and Sm,
a sum of contents of one or more elements among Y, Dy, Ho, Er, Gd, Ce, Nd, Pm, Eu, Tb, Tm, Yb, Lu, and Sm contained in the third accessory ingredient being 4.0 parts by mole or less, based on 100 parts by mole of the base material main ingredient.

5. The dielectric ceramic composition of claim 1 , wherein the accessory ingredient further comprises a fourth accessory ingredient containing one or more of oxides and carbonates of Ba,
a content of Ba contained in the fourth accessory ingredient being 4.0 parts by mole or less, based on 100 parts by mole of the base material main ingredient.

6. The dielectric ceramic composition of claim 1 , wherein the accessory ingredient further comprises a fifth accessory ingredient containing one or more selected from a group consisting of oxides and carbonates of either of or both of Ca and Zr,
a sum of contents of either of or both of Ca and Zr contained in the fifth accessory ingredient being 20 parts by mole or less, based on 100 parts by mole of the base material main ingredient.

7. The dielectric ceramic composition of claim 1 , wherein the accessory ingredient further comprises a sixth accessory ingredient containing one or more selected from a group consisting of glass containing Si and oxides and carbonates of either of or both of Si and Al,
a sum of contents of either of or both of Si and Al contained in the sixth accessory ingredient being 3.0 parts by mole or less, based on 100 parts by mole of the base material main ingredient.

8. The dielectric ceramic composition of claim 1 , wherein the accessory ingredient comprises:
one or more selected from a group consisting of a second accessory ingredient containing one or more of the oxides and carbonates of fixed-valence acceptor elements and a fourth accessory ingredient containing one or more of the oxides and carbonates of Ba; and
a sixth accessory ingredient containing one or more selected from a group consisting of glass containing Si and oxides and carbonates of Si, and
when a content of Mg based on 100 parts by mole of the base material main ingredient is defined as x, and a content ratio (Ba/Si) of Ba and Si is defined as y, Mg, Ba, and Si are contained within a content range represented as straight lines connecting points to one another at which (x, y) is represented as A(0, 1.6), B(0.5, 1.28), C(1.0, 1.28), D(2.0, 0.64), E(2.0, 0), F(1.0, 0), G(0.5, 0.32), and H(0, 0.96), respectively, and contained to be within a region enclosed by the straight lines.

9. A multilayer ceramic capacitor comprising:
a ceramic body in which dielectric layers and first and second internal electrodes are alternately stacked; and
first and second external electrodes formed on outer surfaces of the ceramic body and electrically connected to the first and second internal electrodes,
wherein the dielectric layer contains a base material main ingredient and an accessory ingredient,
the accessory ingredient containing one or more selected from a group consisting of oxides and carbonates of one or more elements among Bi and Li, and
when the accessory ingredient contains Bi, a content of Bi being 0.1 to 0.5 part by mole, based on 100 parts by mole of the base material main ingredient, and
when the accessory ingredient contains Li, a content of Li being 0.1 to 0.5 part by mole, based on 100 parts by mole of the base material main ingredient,
wherein the accessory ingredient further comprises a first accessory ingredient containing one or more of one or more variable-valence acceptor elements selected from a group consisting of Mn, V, Cr, Fe, Ni, Co, Cu, and Zn, oxides of the variable-valence acceptor elements, and carbonates of the variable-valence acceptor elements,
a sum of contents of one or more variable-valence acceptor elements among Mn, V, Cr, Fe, Ni, Co, Cu, and Zn contained in the first accessory ingredient being 0.1 to 2.0 parts by mole, based on 100 parts by mole of the base material main ingredient.

10. The multilayer ceramic capacitor of claim 9 , wherein the base material main ingredient comprises one or more selected from a group consisting of BaTiO 3 , (Ba 1-x Ca x )(Ti 1-y Ca y )O 3 (0≦x≦0.3 an 0≦y≦0.1), (Ba 1-x Ca x )(Ti 1-y Zr y )O 3 (0≦x≦0.3 and 0≦y≦0.5), and Ba(Ti 1-y Zr y )O 3 (0<y≦0.5).

11. The multilayer ceramic capacitor of claim 9 , wherein the accessory ingredient further comprises a second accessory ingredient containing one or more of fixed-valence acceptor elements, oxides of the fixed-valence acceptor elements, and carbonates of the fixed-valence acceptor elements,
a content of the fixed-valence acceptor elements contained in the second accessory ingredient being 2.0 parts by mole or less, based on 100 parts by mole of the base material main ingredient.

12. The multilayer ceramic capacitor of claim 9 , wherein the accessory ingredient further comprises a third accessory ingredient containing one or more of one or more elements selected from a group consisting of Y, Dy, Ho, Er, Gd, Ce, Nd, Pm, Eu, Tb, Tm, Yb, Lu, and Sm, oxides of the selected one or more elements selected from the group, and carbonates of the selected one or more elements selected from the group,
a sum of contents of one or more elements among Y, Dy, Ho, Er, Gd, Ce, Nd, Pm, Eu, Tb, Tm, Yb, Lu, and Sm contained in the third accessory ingredient being 4.0 parts by mole or less, based on 100 parts by mole of the base material main ingredient.

13. The multilayer ceramic capacitor of claim 9 , wherein the accessory ingredient further comprises a fourth accessory ingredient containing one or more o

Assignees

• Samsung Electro Mech

Inventors

• Yoon Seok Hyun
• Park Jae Sung
• Kim Chang Hoon
• Kim Doo Young

Classifications

• H01G4/30 Primary

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

• C04B35/468 Primary

  based on barium titanates · CPC title

• H01G4/232

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

• H01G4/1227

  based on alkaline earth titanates · CPC title

• C04B2235/6582

  Hydrogen containing atmosphere · CPC title