Ceramic dielectric composition and multilayer ceramic capacitor containing the same

Patent metadata

Field	Value
Publication number	US-2017162323-A1
Application number	US-201715434697-A
Country	US
Kind code	A1
Filing date	Feb 16, 2017
Priority date	Dec 8, 2014
Publication date	Jun 8, 2017
Grant date	—

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

1 - 12 . (canceled)

13 . 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.

14 . The multilayer ceramic capacitor of claim 13 , wherein x and y have different values.

15 . The multilayer ceramic capacitor of claim 13 , 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.

16 . The multilayer ceramic capacitor of claim 13 , 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 magnisium (Mg) and aluminum (Al), based on 100 at % of the base material powder.

17 . The multilayer ceramic capacitor of claim 13 , 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, 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).

18 . The multilayer ceramic capacitor of claim 13 , 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

• H01G4/005

  Electrodes · CPC title

• H01G4/248

  the terminals embracing or surrounding the capacitive element, e.g. caps (H01G4/252 takes precedence) · CPC title

• C04B2235/768

  Perovskite structure ABO3 · CPC title

• H01G4/1245 Primary

  containing also titanates · CPC title

• C04B35/64

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