US5889647A
Expired / Lapsed
US
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Multilayer capacitor comprising tungsten-containing BaTiO3
Assignee: US Philips Corp
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Filing: 1997-08-26
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Granted: 1999-03-30
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Expires: 2017-08-26
Abstract
Abstract A capacitor comprising a ceramic dielectric material and at least two electrodes, said dielectric material essentially consisting of a dielectric composition with a doped barium-calcium-zirconium-titanate, said doped barium-calcium-zirconium-titanate having the composition Ba.sub.0.96 Ca.sub.0.04).sub.a Ti.sub.0.82-y Zr.sub.0.18 Mn.sub.y !O.sub.3 , wherein 0.001≦y≦0.01, 1.00<a≦1.02 and being doped with tungsten in a quantity r of 0.001 to 0.005 mol/formula unit and with at least one element A of the group formed by aluminium, gallium, yttrium, zinc, nickel and ytterbium in a quantity s of 0.001 to 0.005 mol/formula unit.
Inventors
- 👤 Peter Hansen
- 👤 Detlev Hennings
- 👤 Baby S. Schreinemacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:49
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1218; H01G4/1227
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
86 words
A capacitor, comprising a ceramic dielectric material and at least two electrodes, said dielectric material essentially consisting of a dielectric composition with a doped barium-calcium-zirconium-titanate, characterized in that said doped barium-calcium-zirconium-titanate has the composition (Ba.sub.0.96 Ca.sub.0.04).sub.a Ti.sub.0.82-y Zr.sub.0.18 Mn.sub.y !O.sub.3, wherein 0.001≦y≦0.01, 1.00<a≦1.02 and being doped with tungsten in a quantity r of 0.001 to 0.005 mol/formula unit and with at least one element of the group formed by aluminum, gallium, yttrium, zinc, nickel and ytterbium in a quantity s of 0.001 to 0.005 mol/formula unit.
Claim 2
Dependent Claim
86 words
A capacitor, comprising a ceramic dielectric material and at least two electrodes, said dielectric material essentially consisting of a dielectric composition with a doped barium-calcium-zirconium-titanate, characterized in that said doped barium-calcium-zirconium-titanate has the composition (Ba.sub.0.96 Ca.sub.0.04).sub.a Ti.sub.0.82-y Zr.sub.0.18 Mn.sub.y !O.sub.3, wherein 0.001≦y≦0.01, 1.00<a≦1.02 and being doped with tungsten in a quantity r of 0.001 to 0.005 mol/formula unit and with at least one element of the group formed by aluminum, gallium, yttrium, zinc, nickel and ytterbium in a quantity s of 0.001 to 0.005 mol/formula unit.
Claim 3
Dependent Claim
23 words
A capacitor as claimed in claim 1, characterized in that nickel or a nickel alloy is used as the material for the electrodes.
Claim 4
Dependent Claim
25 words
A capacitor as claimed in claim 1, characterized in that the capacitor is a multilayer capacitor comprising internal electrodes of nickel or a nickel alloy.
Claim 5
Dependent Claim
22 words
A capacitor as claimed in claim 1, characterized in that y≦0.005 and the atomic ratio n of (y+S) is smaller than 1.
Claim 6
Dependent Claim
50 words
A capacitor as claimed in claim 1, characterized in that the dielectric ceramic composition comprises 0.1-1% by weight of a sintering aid composed of 0.16 to 0.29 mol of lithium oxide, 0.004 to 0.39 mol of one of the oxides CaO, MgO, BaO or SrO as well as silicon oxide.
Claim 7
Dependent Claim
83 words
A capacitor, comprising a ceramic dielectric material and at least two electrodes, said dielectric material consisting essentially of a dielectric composition with a doped barium-calcium-zirconium titanate, characterized in that said doped barium-calcium-zirconium titanate has the composition: (Ba.sub.0.96 Ca.sub.0.04).sub.a Ti.sub.0.82-y ZR.sub.0.18 Mn.sub.y !O.sub.3, wherein y≦0.005, 1>a=1.01 mol/formula unit and being doped with tungsten in a quantity r=0.0025 mol/formula unit and with at least one element selected from the group consisting of aluminum, gallium, yttrium, zinc, nickel and ytterbium in a quantity s>0.010 mol/formula unit.
Claim 8
Dependent Claim
83 words
A capacitor, comprising a ceramic dielectric material and at least two electrodes, said dielectric material consisting essentially of a dielectric composition with a doped barium-calcium-zirconium titanate, characterized in that said doped barium-calcium-zirconium titanate has the composition: (Ba.sub.0.96 Ca.sub.0.04).sub.a Ti.sub.0.82-y ZR.sub.0.18 Mn.sub.y !O.sub.3, wherein y≦0.005, 1>a=1.01 mol/formula unit and being doped with tungsten in a quantity r=0.0025 mol/formula unit and with at least one element selected from the group consisting of aluminum, gallium, yttrium, zinc, nickel and ytterbium in a quantity s>0.010 mol/formula unit.
References Cited (Backward Citations)
US5319517A
Cited
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