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

Patent metadata

Field	Value
Publication number	US-9576730-B2
Application number	US-201514878941-A
Country	US
Kind code	B2
Filing date	Oct 8, 2015
Priority date	Jan 27, 2015
Publication date	Feb 21, 2017
Grant date	Feb 21, 2017

Abstract

A dielectric ceramic composition contains a base material main ingredient and an accessory ingredient. The base material main ingredient includes a first base material main ingredient containing BaTiO 3 and a second base material main ingredient containing (Na 1-y K y )NbO 3 . The base material main ingredient is represented by (1−x)BaTiO 3 -x(Na 1-y K y )NbO 3 , in which x and y satisfy 0.005≦x≦0.5 and 0.3≦y≦1.0, respectively.

First claim

What is claimed is:

1. A dielectric ceramic composition comprising a main ingredient of a base material and an accessory ingredient,
wherein the main ingredient of the base material includes a first main ingredient containing BaTiO 3 and a second main ingredient containing (Na 1-y K y )NbO 3 ,
the main ingredient of the base material is represented by (1−x)BaTiO 3 -x(Na 1-y K y )NbO 3 , in which x and y satisfy 0.005≦x≦0.5 and 0.3≦y≦1.0, respectively,
the accessory ingredient includes a first accessory ingredient containing one or more selected from the group consisting of oxides and carbonates of variable-valence acceptor elements containing one or more of manganese (Mn), vanadium (V), chromium (Cr), iron (Fe), nickel (Ni), cobalt (Co), copper (Cu), and zinc (Zn), and a third accessory ingredient containing one or more selected from the group consisting of oxides of one or more of yttrium (Y), dysprosium (Dy), samarium (Sm), gadolinium (Gd), holmium (Ho), erbium (Er), and ytterbium (Yb), and
a sum of contents of one or more variable-valence acceptor elements of manganese (Mn), vanadium (V), chromium (Cr), iron (Fe), nickel (Ni), cobalt (Co), copper (Cu), and zinc (Zn), contained in the first accessory ingredient, is 0.1 to 5.0 parts by mole based on 100 parts by mole of the main ingredient of the base material.

2. The dielectric ceramic composition of claim 1 , wherein the main ingredient of the base material is a solid solution of BaTiO 3 and (Na 1-y K y )NbO 3 .

3. The dielectric ceramic composition of claim 1 , wherein the accessory ingredient further includes at least one of:
a second accessory ingredient containing one or both selected from the group consisting of SiO 2 and glass containing a silicon (Si) element.

4. The dielectric ceramic composition of claim 3 , wherein:
a content of the silicon (Si) element contained in the second accessory ingredient is 0.1 to 5.0 parts by mole based on 100 parts by mole of the main ingredient of the base material, and
a sum of contents of one or more of yttrium (Y), dysprosium (Dy), samarium (Sm), gadolinium (Gd), holmium (Ho), erbium (Er), and ytterbium (Yb), contained in the third accessory ingredient, is 0.2 to 5.0 parts by mole based on 100 parts by mole of the main ingredient of the base material.

5. The dielectric ceramic composition of claim 1 , wherein the accessory ingredient further includes a second accessory ingredient containing one or both selected from the group consisting of SiO 2 and glass containing a silicon (Si) element, and
a content of the silicon (Si) element contained in the second accessory ingredient is 0.1 to 5.0 parts by mole based on 100 parts by mole of the main ingredient of the base material.

6. The dielectric ceramic composition of claim 1 , wherein
a sum of contents of one or more of yttrium (Y), dysprosium (Dy), samarium (Sm), gadolinium (Gd), holmium (Ho), erbium (Er), and ytterbium (Yb), contained in the third accessory ingredient, is 0.2 to 5.0 parts by mole based on 100 parts by mole of the main ingredient of the base material.

7. A dielectric material formed by sintering the dielectric ceramic composition of claim 1 .

8. A multilayer ceramic capacitor comprising:
a ceramic body in which dielectric layers and internal electrodes are alternately stacked; and
external electrodes formed on outer surfaces of the ceramic body and electrically connected to the internal electrodes,
wherein the dielectric layers are formed of a dielectric ceramic composition containing a main ingredient of a base material and an accessory ingredient,
the main ingredient of the base material including a first main ingredient containing BaTiO 3 and a second main ingredient containing (Na 1-y K y )NbO 3 ,
the main ingredient of the base material is represented by (1−x)BaTiO 3 -x(Na 1-y K y )NbO 3 , in which x and y satisfy 0.005≦x≦0.5 and 0.3≦y≦1.0, respectively,
the accessory ingredient includes a first accessory ingredient containing one or more selected from the group consisting of oxides and carbonates of variable-valence acceptor elements containing one or more of manganese (Mn), vanadium (V), chromium (Cr), iron (Fe), nickel (Ni), cobalt (Co), copper (Cu), and zinc (Zn), and a third accessory ingredient containing one or more selected from the group consisting of oxides of one or more of yttrium (Y), dysprosium (Dy), samarium (Sm), gadolinium (Gd), holmium (Ho), erbium (Er), and ytterbium (Yb), and
a sum of contents of one or more variable-valence acceptor elements of manganese (Mn), vanadium (V), chromium (Cr), iron (Fe), nickel (Ni), cobalt (Co), copper (Cu), and zinc (Zn), contained in the first accessory ingredient, is 0.1 to 5.0 parts by mole based on 100 parts by mole of the main ingredient of the base material.

9. The multilayer ceramic capacitor of claim 7 , wherein the main ingredient of the base material is a solid solution of BaTiO 3 and (Na 1-y K y )NbO 3 .

10. The multilayer ceramic capacitor of claim 8 , wherein the accessory ingredient further includes at least one of:
a second accessory ingredient containing one or both selected from the group consisting of SiO 2 and glass containing a silicon (Si) element.

11. The multilayer ceramic capacitor of claim 10 , wherein:
a content of the silicon (Si) element contained in the second accessory ingredient is 0.1 to 5.0 parts by mole based on 100 parts by mole of the main ingredient of the base material, and
a sum of contents of one or more of yttrium (Y), dysprosium (Dy), samarium (Sm), gadolinium (Gd), holmium (Ho), erbium (Er), and ytterbium (Yb), contained in the third accessory ingredient, is 0.2 to 5.0 parts by mole based on 100 parts by mole of the main ingredient of the base material.

12. The multilayer ceramic capacitor of claim 8 , wherein the accessory ingredient further includes a second accessory ingredient containing one or both selected from the group consisting of SiO 2 and glass containing a silicon (Si) element, and
a content of the silicon (Si) element contained in the second accessory ingredient is 0.1 to 5.0 parts by mole based on 100 parts by mole of the main ingredient of the base material.

13. The multilayer ceramic capacitor of claim 8 , wherein
a sum of contents of one or more of yttrium (Y), dysprosium (Dy), samarium (Sm), gadolinium (Gd), holmium (Ho), erbium (Er), and ytterbium (Yb), contained in the third accessory ingredient, is 0.2 to 5.0 parts by mole based on 100 parts by mole of the main ingredient of the base material.

Assignees

• Samsung Electro Mech

Inventors

• Park Yun Jung
• Yoon Seok Hyun
• Kim Chang Hoon
• Jeon Song Je
• Park No Hoon
• Jo Soo Kyong

Classifications

• H01G4/30

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

• H01G4/1227 Primary

  based on alkaline earth titanates · CPC title

• C04B35/4682

  based on BaTiO3 perovskite phase · CPC title

• C04B2235/3251

  Niobium oxides, niobates, tantalum oxides, tantalates, or oxide-forming salts thereof · CPC title

• C04B2235/3262

  Manganese oxides, manganates, rhenium oxides or oxide-forming salts thereof, e.g. MnO · CPC title