Ceramic dielectric composition and multilayer ceramic capacitor containing the same

• US 9,947,470 B2
• Filed: 02/16/2017
• Issued: 04/17/2018
• Est. Priority Date: 12/08/2014
• Status: Active Grant

• Current Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: Park, Jae Sung, Yoon, Seok Hyun, Kim, Chang Hoon, Kim, Doo Young, Jo, Soo Kyong
• Primary Examiner(s): GROUP, KARL E
• Application Number:
  US15/434,697
• Publication Number:
  US 20170162323A1
• Time in Patent Office: 425 Days
• CPC Class Codes: B32B 18/00 Layered products essentially comprising ceramics, e.g. refractory products
• CPC Class Codes: B32B 2457/16 Capacitors
• CPC Class Codes: C04B 2235/3206 Magnesium oxides or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3208 Calcium oxide or oxide-forming salts thereof, e.g. lime
• CPC Class Codes: C04B 2235/3213 Strontium oxides or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3215 Barium oxides or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3217 Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
• CPC Class Codes: C04B 2235/3227 Lanthanum oxide or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3229 Cerium oxides or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3236 Alkaline earth titanates
• CPC Class Codes: C04B 2235/3249 containing also titanium oxide or titanates, e.g. lead zirconate titanate (PZT)
• CPC Class Codes: C04B 2235/3251 Niobium oxides, niobates, tantalum oxides, tantalates, or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3294 Antimony oxides, antimonates, antimonites or oxide forming salts thereof, indium antimonate
• CPC Class Codes: C04B 2235/3418 Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint glass constituents C04B2235/36
• CPC Class Codes: C04B 2235/442 Carbonates
• CPC Class Codes: C04B 2235/6025 Tape casting, e.g. with a doctor blade
• CPC Class Codes: C04B 2235/656 characterised by specific heating conditions during heat treatment
• CPC Class Codes: C04B 2235/6582 Hydrogen containing atmosphere
• CPC Class Codes: C04B 2235/768 Perovskite structure ABO3
• CPC Class Codes: C04B 2235/96 Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
• CPC Class Codes: C04B 2237/346 : Titania or titanates
• CPC Class Codes: C04B 2237/348 : Zirconia, hafnia, zirconates or hafnates
• CPC Class Codes: C04B 2237/704 : of one or more of the ceramic layers or articles
• CPC Class Codes: C04B 35/465 : based on alkaline earth metal titanates
• CPC Class Codes: C04B 35/47 : based on strontium titanates
• CPC Class Codes: C04B 35/49 : containing also titanium oxides or titanates
• CPC Class Codes: C04B 35/6261 : Milling
• CPC Class Codes: C04B 35/62675 : characterised by the treatment temperature
• CPC Class Codes: C04B 35/64 : Burning or sintering processes C04B33/32 takes precedence ; powder metallurgy B22F
• CPC Class Codes: H01G 4/005 : Electrodes
• CPC Class Codes: H01G 4/1227 : based on alkaline earth titanates
• CPC Class Codes: H01G 4/1236 : based on zirconium oxides or zirconates H01G4/1263 takes precedence
• CPC Class Codes: H01G 4/1245 : containing also titanates
• CPC Class Codes: H01G 4/248 : the terminals embracing or surrounding the capacitive element, e.g. caps H01G4/252 takes precedence
• CPC Class Codes: H01G 4/30 : Stacked capacitors H01G4/33 takes precedence

Abstract

A ceramic dielectric composition contains a base material powder represented by one or more of (Ca_1-xSr_x) (Zr_1-yTi_y)O₃, Ca(Zr_1-yTi_y)O₃, Sr(Zr_1-xTi_y)O₃, (Ca_1-xSr_x) ZrO₃, and (Ca_1-xSr_x)TiO₃, 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.

Claims

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-xSr_x)(Zr_1-yTi_y)O₃, Ca(Zr_1-yTi_y)O₃, Sr(Zr_1-yTi_y)O₃, (Ca_1-xSr_x)ZrO₃, and (Ca_1-xSr_x)TiO₃, 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.