Dielectric ceramic composition, dielectric material and multilayer ceramic capacitor including the same

Patent metadata

Field	Value
Publication number	US-9422197-B2
Application number	US-201514678519-A
Country	US
Kind code	B2
Filing date	Apr 3, 2015
Priority date	Jan 5, 2015
Publication date	Aug 23, 2016
Grant date	Aug 23, 2016

Abstract

There is provided a dielectric ceramic composition including: a major component (a barium titanate-based base material); and a minor component, wherein in an XRD analysis of a sintered body obtained by sintering the dielectric ceramic composition, when a (110) peak of BaTiO 3 is set as 1.00, a ratio of a peak of pyrochlore (RE 2 Ti 2 O 7 ) at about 30.5 degrees with respect to the (110) peak of BaTiO 3 satisfies 0.02 or less, where RE is at least one of Y, Dy, Ho, Sm, Gd, Er, La, Ce, Nd, Tb, and Pr.

First claim

What is claimed is:

1. A dielectric ceramic composition comprising:
a major component (a barium titanate-based base material); and
a minor component,
wherein the dielectric ceramic composition is sintered to form a sintered body, and in an XRD analysis of the sintered body, when a (110) peak of BaTiO 3 is set as 1.00, a ratio of a peak of pyrochlore (RE 2 Ti 2 O 7 ) at about 30.5 degrees with respect to the (110) peak of BaTiO 3 satisfies 0.02 or less,
where RE is at least one of Y, Dy, Ho, Sm, Gd, Er, La, Ce, Nd, Tb, and Pr, and
the minor component includes:
a fifth minor component including at least one selected from the group consisting of oxides and carbonates of at least one of Ba and Ca; and
a sixth minor component including at least one selected from the group consisting of oxides and carbonates of Si, and glass including Si, and
when a total content of the at least one of Ba and Ca included in the fifth minor component is x and a content of Si included in the sixth minor component is y, x/y satisfies 1.44 to 2.56.

2. The dielectric ceramic composition of claim 1 , wherein the major component includes at least one selected from the 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 minor component further includes at least one of the following components:
a first minor component including at least one selected from the group consisting of oxides and carbonates of at least one of variable-valence acceptor elements including Mn, V, Cr, Fe, Ni, Co, Cu, and Zn;
a second minor component including at least one selected from the group consisting of oxides and carbonates of a fixed-valence acceptor element including Mg;
a third minor component including at least one selected from the group consisting of oxides and carbonates of at least one of Y, Dy, Ho, Sm, Gd, Er, La, Ce, Nd, Tb, and Pr; and
a fourth minor component including CaZrO 3 .

4. The dielectric ceramic composition of claim 1 , wherein the minor component further includes a first minor component including at least one selected from the group consisting of oxides and carbonates of at least one of variable-valence acceptor elements including Mn, V, Cr, Fe, Ni, Co, Cu, and Zn, and
the at least one of variable-valence acceptor elements of Mn, V, Cr, Fe, Ni, Co, Cu, and Zn included in the first minor component has a total content of 0.2 to 2.0 parts by mol on the basis of 100 parts by mol of the major component.

5. The dielectric ceramic composition of claim 1 , wherein the minor component further includes a second minor component including at least one selected from the group consisting of oxides and carbonates of a fixed-valence acceptor element including Mg, and
the fixed-valence acceptor element including Mg included in the second minor component has a content of 0.5 parts by mol or less on the basis of 100 parts by mol of the major component.

6. The dielectric ceramic composition of claim 1 , wherein the minor component further includes a third minor component including at least one selected from the group consisting of oxides and carbonates of at least one of Y, Dy, Ho, Sm, Gd, Er, La, Ce, Nd, Tb, and Pr included in the third minor component has a total content of 0.2 to 5.0 parts by mol on the basis of 100 parts by mol of the major component.

7. The dielectric ceramic composition of claim 1 , wherein the minor component further includes a fourth minor component including CaZrO 3 , and
CaZrO 3 has a content of 0.25 to 5.0 parts by mol on the basis of 100 parts by mol of the major component.

8. The dielectric ceramic composition of claim 1 , wherein
the at least one of Ba and Ca included in the fifth minor component has a total content of 0.72 to 7.68 parts by mol on the basis of 100 parts by mol of the major component.

9. The dielectric ceramic composition of claim 1 , wherein
Si included in the sixth minor component has a content of 0.5 to 3.0 parts by mol on the basis of 100 parts by mol of the major component.

10. A dielectric material obtained by sintering the dielectric ceramic composition of claim 1 .

11. A multilayer ceramic capacitor comprising:
a ceramic body in which dielectric layers and internal electrodes are alternately stacked; and
external electrodes provided on external surfaces of the ceramic body and electrically connected to the internal electrodes,
wherein, in an XRD analysis of the dielectric layer, when a (110) peak of BaTiO 3 is set as 1.00, a ratio of a peak of pyrochlore (RE 2 Ti 2 O 7 ) at about 30.5 degrees with respect to the (110) peak of BaTiO 3 satisfies 0.02 or less,
where RE is at least one of Y, Dy, Ho, Sm, Gd, Er, La, Ce, Nd, Tb, and Pr, and
wherein the dielectric layer is formed of a dielectric ceramic composition including a major component (a barium titanate-based base material) and a minor component, and
the minor component includes:
a fifth minor component including at least one selected from the group consisting of oxides and carbonates of at least one of Ba and Ca; and
a sixth minor component including at least one selected from the group consisting of oxides and carbonates of Si, and glass including Si, and
when a total content of the at least one of Ba and Ca included in the fifth minor component is x and a content of Si included in the sixth minor component is y, x/y satisfies 1.44 to 2.56.

12. The multilayer ceramic capacitor of claim 11 , wherein
the major component includes at least one selected from the 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).

13. The multilayer ceramic capacitor of claim 11 , wherein
the minor component further includes at least one of the following components:
a first minor component including at least one selected from the group consisting of oxides and carbonates of at least one of variable-valence acceptor elements including Mn, V, Cr, Fe, Ni, Co, Cu, and Zn;
a second minor component including at least one selected from the group consisting of oxides and carbonates of a fixed-valence acceptor element including Mg;
a third minor component including at least one selected from the group consisting of oxides and carbonates of at least one of Y, Dy, Ho, Sm, Gd, Er, La, Ce, Nd, Tb, and Pr; and
a fourth minor component including CaZrO 3 .

14. The multilayer ceramic capacitor of claim 11 , wherein
the minor component further includes a first minor component including at least one selected from the group consisting of oxides and carbonates of at least one of variable-valence acceptor elements including Mn, V, Cr, Fe, Ni, Co, Cu, and Zn, and
the at least one of variable-valence acceptor elements of Mn, V, Cr, Fe, Ni, Co, Cu, and Zn included in the first minor component has a total content of 0.2 to 2.0 parts by mol on the basis of 100 parts by mol of the major component.

15. The multilayer ceramic capacitor of claim 11 , wherein
the minor component further includes a second minor component including at least one selected from the group consisting of oxides and carbonates of a fixed-valence acceptor element including Mg, and
the fixed-valence acceptor element including Mg included in the second minor component has a content of 0.5 parts by mol or less on the basis of 100 parts by mol of the major component.

16. The multilayer ceramic capacitor of claim 11 , wherein
the minor component further inclu

Assignees

• Samsung Electro Mech
• Samung Electro-Mechanics Co Ltd

Inventors

• Yoon Seok Hyun
• Park Yun Jung
• Kim Doo Young
• Jeon Song Je
• Kim Chang Hoon

Classifications

• C04B2235/3206

  Magnesium oxides or oxide-forming salts thereof · CPC title

• C04B35/4682 Primary

  based on BaTiO3 perovskite phase · CPC title

• C04B2235/36

  Glass starting materials for making ceramics, e.g. silica glass · CPC title

• H01G4/30

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

• C04B2235/3284

  Zinc oxides, zincates, cadmium oxides, cadmiates, mercury oxides, mercurates or oxide forming salts thereof · CPC title