Dielectric ceramic composition and multilayer ceramic capacitor containing the same

Patent metadata

Field	Value
Publication number	US-2015299046-A1
Application number	US-201414317965-A
Country	US
Kind code	A1
Filing date	Jun 27, 2014
Priority date	Apr 16, 2014
Publication date	Oct 22, 2015
Grant date	—

Abstract

A dielectric ceramic composition may include a base powder represented by (1−x)BaTiO 3 -xBiMO 3 (M being configured of Mg and Ti) containing a first main component represented by BaTiO 3 and a second main component represented by BiMO 3 , x satisfying 0.005≦x≦0.5, and Some embodiments of the present disclosure may provide a novel dielectric ceramic composition capable of securing X8R temperature characteristics and reliability.

First claim

1 . A dielectric ceramic composition comprising a base powder (M being configured of Mg and Ti) represented by (1−x)BaTiO 3 -xBiMO 3 containing a first main component represented by BaTiO 3 and a second main component represented by BiMO 3 , wherein x satisfies 0.005≦x≦0.5, 0.1 to 5.0 mol % of a first accessory component, an oxide or a carbonate containing at least one of Mn, V, Cr, Fe, Ni, Co, Cu and Zn, based on 100 mol % of the base powder, and 0.1 to 5.0 mol % of a second accessory component, an oxide containing Si or a glass compound containing Si, based on 100 mol % of the base powder.

2 . The dielectric ceramic composition of claim 1 , wherein M is represented by Mg 1-y Ti y (where y satisfies 0.4≦y≦0.6).

3 . (canceled)

4 . (canceled)

5 . The dielectric ceramic composition of claim 1 , wherein the first main component and the second main component are a solid solution.

6 . 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 disposed on end portions of the ceramic body and electrically connected to the first and second internal electrodes, respectively, wherein the dielectric layer contains a dielectric ceramic composition containing a base powder (M being configured of Mg and Ti) represented by (1−x)BaTiO 3 -xBiMO 3 containing a first main component represented by BaTiO 3 and a second main component represented by BiMO 3 , and x satisfies 0.005≦x≦0.5, 0.1 to 5.0 mol % of a first accessory component, an oxide or a carbonate containing at least one of Mn, V, Cr, Fe, Ni, Co, Cu and Zn, based on 100 mol % of the base powder, and 0.1 to 5.0 mol % of a second accessory component, an oxide containing Si or a glass compound containing Si, based on 100 mol % of the base powder.

7 . The multilayer ceramic capacitor of claim 6 , wherein M is represented by Mg 1-y Ti y (where y satisfies 0.4≦y≦0.6).

8 . (canceled)

9 . (canceled)

10 . The multilayer ceramic capacitor of claim 6 , wherein the first main component and the second main component are a solid solution.

11 . The dielectric ceramic composition of claim 1 , wherein a room temperature permittivity is 2000 or more, a temperature coefficient of capacitance at 150° C. is between −15% and +15%, and a withstand voltage at 150° C. is 50 V/μm or more.

12 . The dielectric ceramic composition of claim 11 , wherein the room temperature permittivity is 2500 or more.

13 . The dielectric ceramic composition of claim 11 , wherein the temperature coefficient of capacitance at 150° C. is between −10% and +10%.

14 . The dielectric ceramic composition of claim 11 , wherein the withstand voltage at 150° C. is 75 V/μm or more.

Assignees

• Samsung Electro Mech

Inventors

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

Classifications

• C04B2235/3206

  Magnesium oxides or oxide-forming salts thereof · CPC title

• C04B2235/3418

  Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint · CPC title

• C04B2237/68

  Forming laminates or joining articles wherein at least one substrate contains at least two different parts of macro-size, e.g. one ceramic substrate layer containing an embedded conductor or electrode · CPC title

• C04B2235/3279

  Nickel oxides, nickalates, or oxide-forming salts thereof · CPC title

• C04B2235/6025

  Tape casting, e.g. with a doctor blade · CPC title