Ceramic dielectric composition and multilayer ceramic capacitor containing the same

Patent metadata

Field	Value
Publication number	US-9947470-B2
Application number	US-201715434697-A
Country	US
Kind code	B2
Filing date	Feb 16, 2017
Priority date	Dec 8, 2014
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

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-x 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 have on may 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 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 formed on opposing end portions of the ceramic body and electrically connected to the first and second internal electrodes,
wherein the dielectric layers contain a ceramic dielectric composition containing 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,
wherein the ceramic dielectric composition further contains 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, and
wherein the ceramic dielectric composition further contains 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 multilayer ceramic capacitor of claim 1 , wherein x and y have different values.

3. The multilayer ceramic capacitor of claim 1 , wherein the ceramic dielectric composition further contains 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 multilayer ceramic capacitor of claim 1 , wherein room-temperature permittivity 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

• C04B2235/3227

  Lanthanum oxide or oxide-forming salts thereof · CPC title

• C04B35/64

  Burning or sintering processes (C04B33/32 takes precedence {; powder metallurgy B22F}) · CPC title

• H01G4/30

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

• C04B35/47

  based on strontium titanates · 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