Ceramic dielectric composition and multilayer ceramic capacitor containing the same

Patent metadata

Field	Value
Publication number	US-9627134-B2
Application number	US-201514936409-A
Country	US
Kind code	B2
Filing date	Nov 9, 2015
Priority date	Dec 8, 2014
Publication date	Apr 18, 2017
Grant date	Apr 18, 2017

Abstract

A ceramic dielectric composition contains a base material powder represented by one or more of (Ca 1−x Sr x )(Zr 1−y Ti y )O 3 , Ca(Zr 1−y Ti y )O 3 , Sr(Zr 1−y Ti y )O 3 , (Ca 1−x Sr x )ZrO 3 , and (Ca 1−x Sr x )TiO 3 , in which x and y satisfy 0≦x≦1.0 and 0.2≦y≦0.9, respectively. The ceramic dielectric composition may have high room-temperature permittivity and excellent ESD protection characteristics and may secure withstand voltage characteristics while implementing relatively high capacitance.

First claim

What is claimed is:

1. A ceramic dielectric composition comprising:
a base material powder represented by one or more of (Ca 1−x Sr x )(Zr 1−y Ti y )O 3 , Ca(Zr 1−y Ti y )O 3 , Sr(Zr 1−y Ti y )O 3 , (Ca 1−x Sr x )ZrO 3 , and (Ca 1−x Sr x )TiO 3 , in which x and y satisfy 0≦x≦1.0 and 0.2≦y≦0.9, respectively;
0.1 at % to 1.0 at % of a second accessory ingredient, an oxide or carbonate containing at least one of magnesium (Mg) and aluminum (Al), based on 100 at % of the base material powder;
a third accessory ingredient, an oxide or carbonate containing at least one of cerium (Ce), niobium (Nb), lanthanum (La), and antimony (Sb); and
a fourth accessory ingredient, different from the second accessory ingredient, an oxide or carbonate containing at least one of silicon (Si), barium (Ba), calcium (Ca), and aluminum (Al), or a glass compound containing silicon (Si).

2. The ceramic dielectric composition of claim 1 , wherein x and y have different values.

3. The ceramic dielectric composition of claim 1 , further comprising 0.1 at % to 1.0 at % of a first accessory ingredient, an oxide or carbonate containing at least one of manganese (Mn), vanadium (V), chromium (Cr), Iron (Fe), nickel (Ni), cobalt (Co), copper (Cu), and zinc (Zn), based on 100 at % of the base material powder.

4. The ceramic dielectric composition of claim 1 , wherein room-temperature permittivity of a ceramic body formed of the ceramic dielectric composition is 50 or more.

Assignees

• Samsung Electro Mech

Inventors

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

Classifications

• C04B2235/3217

  Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina · CPC title

• B32B18/00

  Layered products essentially comprising ceramics, e.g. refractory products · CPC title

• C04B2235/3208

  Calcium oxide or oxide-forming salts thereof, e.g. lime · CPC title

• C04B2235/3227

  Lanthanum oxide or oxide-forming salts thereof · CPC title

• H01G4/1245 Primary

  containing also titanates · CPC title