Dielectric ceramic composition, multilayer ceramic capacitor containing the same, and method for manufacturing multilayer ceramic capacitor

Patent metadata

Field	Value
Publication number	US-2017190626-A1
Application number	US-201615284577-A
Country	US
Kind code	A1
Filing date	Oct 4, 2016
Priority date	Jan 5, 2016
Publication date	Jul 6, 2017
Grant date	—

Abstract

A dielectric ceramic composition contains a first main ingredient of BaTiO 3 and a second main ingredient of BaTi 2 O 5 , and a base material powder containing the first and second main ingredients is represented by (1-x)BaTiO 3 -xBaTi 2 O 5 and x satisfies 0.1≦x≦0.8. The dielectric ceramic composition may include additional accessory ingredients, and may be used to form ceramic sheets having internal electrodes of a multilayer ceramic capacitor disposed thereon.

First claim

What is claimed is:

1 . A dielectric ceramic composition comprising a first main ingredient of BaTiO 3 and a second main ingredient of BaTi 2 O 5 , wherein a base material powder containing the first and second main ingredients is represented by (1-x)BaTiO 3 -xBaTi 2 O 5 , and x satisfies 0.1≦x≦0.8.

2 . The dielectric ceramic composition of claim 1 , further comprising a first accessory ingredient,
wherein the first accessory ingredient contains oxides or carbonates of one or more variable valence acceptor elements selected from the group consisting of Manganese (Mn) , vanadium (V), chromium (Cr), iron (Fe), nickel (Ni), cobalt (Co), copper (Cu), and zinc (Zn), and a sum of contents of the one or more variable valence acceptor elements contained in the first accessory ingredient is 0.2 at % to 5.0 at %.

3 . The dielectric ceramic composition of claim 1 , further comprising a second accessory ingredient,
wherein the second accessory ingredient contains one or more selected from the group consisting of oxides and carbonates of Ba, and a content of the second accessory ingredient is 0.2 mol to 10.0 mol based on 100 mol of the base material powder.

4 . The dielectric ceramic composition of claim 1 , further comprising a third accessory ingredient,
wherein the third accessory ingredient contains one or more selected from the group consisting of oxides of Si, carbonates of Si, and glass containing Si, and a content of the third accessory ingredient is 0.2 mol to 5.0 mol based on 100 mol of the base material powder.

5 . The dielectric ceramic composition of claim 1 , further comprising a fourth accessory ingredient,
wherein the fourth accessory ingredient contains oxides or carbonates of one or more rare earth elements selected from the group consisting of Y, Dy, Ho, La, Ce, Nd, Sm, Gd, and Er, and a sum of contents of the one or more rare earth elements contained in the fourth accessory ingredient is 0.5 at % to 10.0 at %.

6 . The dielectric ceramic composition of claim 1 , further comprising a fifth accessory ingredient,
wherein the fifth accessory ingredient contains one or more selected from the group consisting of oxides and carbonates of a fixed-valence acceptor element including Mg, and a content of the fifth accessory ingredient is 0.5 mol to 5.0 mol based on 100 mol of the base material powder.

7 . A multilayer ceramic capacitor comprising:
a ceramic body including dielectric layers and internal electrodes; and external electrodes disposed on an outer portion of the ceramic body and connected to the internal electrodes, wherein the dielectric layers include a first crystal grain and a second crystal grain, the first crystal grain is a crystal grain in which a Ti/Ba content ratio is less than 1.5, the second crystal grain is a crystal grain in which a Ti/Ba content ratio is 1.5 to 2.5, and an area ratio of the second crystal grain to a total area is 9.5% to 81.4%.

8 . The multilayer ceramic capacitor of claim 7 , wherein the dielectric layer contains a first main ingredient of BaTiO 3 and a second main ingredient of BaTi 2 O 5 , and a base material powder containing the first and second main ingredients is represented by (1-x) BaTiO 3 -xBaTi 2 O 5 , and x satisfies 0.1≦x≦0.8.

9 . The multilayer ceramic capacitor of claim 7 , wherein the internal electrodes contain Ni.

10 . The multilayer ceramic capacitor of claim 7 , wherein the multilayer ceramic capacitor has room-temperature specific resistance of 1E11 Ohm-cm or more, high-temperature withstand voltage at 200° C. of 50V/μm or more, temperature coefficient of capacitance (TCC) at 150° C. less than ±15%, TCC at 200° C. less than ±22%, and room-temperature permittivity of 150 or more.

11 . A method for manufacturing a multilayer ceramic capacitor, the method comprising:
manufacturing a plurality of ceramic sheets using a base material powder containing a first main ingredient of BaTiO 3 and a second main ingredient of BaTi 2 O 5 ; printing an internal electrode on two or more of the ceramic sheets using a conductive paste, and stacking and compressing the ceramic sheets to manufacture a compressed bar; cutting the compressed bar to manufacture a chip; and sintering the chip under a reduction atmosphere, wherein the base material powder is represented by (1-x) BaTiO 3 -xBaTi 2 O 5 , and x satisfies 0.1≦x≦0.8.

12 . The method of claim 11 , wherein the sintering of the chip is performed under 1.0% of H 2 /99% of N 2 atmosphere.

13 . The method of claim 11 , wherein the sintering of the chip is performed at 1200° C.

14 . A dielectric ceramic composition comprising a first crystal grain in which a Ti/Ba content ratio is less than 1.5, and a second crystal grain in which a Ti/Ba content ratio is 1.5 to 2.5,
wherein an area ratio of the second crystal grain to a total area is 9.5% to 81.4%.

15 . The dielectric ceramic composition of claim 14 , wherein the dielectric ceramic composition contains a first main ingredient of BaTiO 3 and a second main ingredient of BaTi 2 O 5 , and
a base material powder containing the first and second main ingredients is represented by (1-x) BaTiO 3 -xBaTi 2 O 5 , and x satisfies 0.1≦x≦0.8.

16 . The dielectric ceramic composition of claim 14 , further comprising a first accessory ingredient,
wherein the first accessory ingredient contains oxides or carbonates of one or more variable valence acceptor elements selected from the group consisting of Manganese (Mn) , vanadium (V), chromium (Cr), iron (Fe), nickel (Ni), cobalt (Co), copper (Cu), and zinc (Zn), and a sum of contents of the one or more variable valence acceptor elements contained in the first accessory ingredient is 0.2 a% to 5.0 at %.

17 . The dielectric ceramic composition of claim 14 , further comprising a second accessory ingredient,
wherein the second accessory ingredient contains one or more selected from the group consisting of oxides and carbonates of Ba, and a content of the second accessory ingredient is 0.2 mol to 10.0 mol based on 100 mol of the base material powder.

18 . The dielectric ceramic composition of claim 14 , further comprising a third accessory ingredient,
wherein the third accessory ingredient contains one or more selected from the group consisting of oxides of Si, carbonates of Si, and glass containing Si, and a content of the third accessory ingredient is 0.2 mol to 5.0 mol based on 100 mol of the base material powder.

19 . The dielectric ceramic composition of claim 14 , further comprising a fourth accessory ingredient,
wherein the fourth accessory ingredient contains oxides or carbonates of one or more rare earth elements selected from the group consisting of Y, Dy, Ho, La, Ce, Nd, Sm, Gd, and Er, and a sum of contents of the one or more rare earth elements contained in the fourth accessory ingredient is 0.5 at % to 10.0 at %.

20 . The dielectric ceramic composition of claim 14 , further comprising a fifth accessory ingredient,
wherein the fifth accessory ingredient contains one or more selected from the group consisting of oxides and carbonates of a fixed-valence acceptor element including Mg, and a content of the fifth accessory ingredient is 0.5 mol to 5.0 mol based on 100 mol of the base material powder.

21 . A multilayer ceramic capacitor comprising:
a ceramic body including dielectric layers and internal electrodes; and external electrodes disposed on an outer portion of the ceramic body and connected to the internal electrodes, wherei

Assignees

• Samsung Electro Mech

Inventors

• Yoon Seok Hyun
• Lee Seung Ho
• Seo Jung Wook
• Jeon Song Je

Classifications

• C04B35/4686 Primary

  based on phases other than BaTiO3 perovskite phase · CPC title

• C04B2235/3215

  Barium oxides or oxide-forming salts thereof · CPC title

• H01G4/30

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

• H01G4/1227

  based on alkaline earth titanates · CPC title

• C04B2235/3267

  MnO2 · CPC title