US6078494A
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Multilayer capacitor comprising barium-titanate doped with silver and rare earth metal
Assignee: DMC2 ELECTRONIC MATERIALS BV
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Filing: 1998-07-22
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Granted: 2000-06-20
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Expires: 2018-07-22
Abstract
Abstract A capacitor including a ceramic dielectric of a dielectric ceramic composition including a doped barium-calcium-zirconium-titanate of the composition (Ba 1- α-μ-ν A.sub.μ D.sub.ν Ca.sub.α) [Ti 1-x- δ-μ'-ν' Mn.sub.δ A'.sub.μ' Zr x ] z O 3 , where A=Ag, A'=Dy, Er, Ho, Y, Yb and Ga; D=Nd, Pr, Sm, Gd; D'=Nb, Mo, 0.10≦x≦0.25, 0≦μ≦0.01, 0≦μ'≦0.01, 0≦ν≦0.01, 0 ν'0.01, 0<δ≦0.01 and 0.995≦z<1 and 0≦α≦0.05, and including at least two electrodes, is characterized by a high dielectric constant K and a long service life, a low loss factor, a high insulation resistance and a capacitance with a low voltage dependence. The temperature dependence of its dielectric constant K corresponds to the EIA-standard Y5V.
Inventors
- 👤 Peter Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:53
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: 9
Claim 1
Independent Claim
100 words
A capacitor comprising a ceramic dielectric of a dielectric ceramic composition, which includes a doped barium-calcium-zirconium-titanate of the composition (Ba 1- α-μ-ν A.sub.μ D.sub.ν Ca.sub.α)[Ti 1-x- δ-μ'-ν' Mn.sub.δ A'.sub.μ' D'.sub.ν' Zr x ] z O 3 , where A=Ag, A'is a member selected from the group consisting of Dy, Er, Ho, Y, Yb and Ga; D is a member selected from the group consisting of Nd, Pr, Sm, Gd; D' is a member selected from the group consisting of Nb or Mo 0.10≦x ≦0.25, 0≦μ≦0.01, 0≦μ'≦0.01, 0≦ν≦0.01, 0≦ν'≦0.01, 0<δ≦0.01 and 0.995 ≦z≦1 and 0≦δα0.005, and comprising at least two electrodes.
Claim 2
Dependent Claim
100 words
A capacitor comprising a ceramic dielectric of a dielectric ceramic composition, which includes a doped barium-calcium-zirconium-titanate of the composition (Ba 1- α-μ-ν A.sub.μ D.sub.ν Ca.sub.α)[Ti 1-x- δ-μ'-ν' Mn.sub.δ A'.sub.μ' D'.sub.ν' Zr x ] z O 3 , where A=Ag, A'is a member selected from the group consisting of Dy, Er, Ho, Y, Yb and Ga; D is a member selected from the group consisting of Nd, Pr, Sm, Gd; D' is a member selected from the group consisting of Nb or Mo 0.10≦x ≦0.25, 0≦μ≦0.01, 0≦μ'≦0.01, 0≦ν≦0.01, 0≦ν'≦0.01, 0<δ≦0.01 and 0.995 ≦z≦1 and 0≦δα0.005, and comprising at least two electrodes.
Claim 3
Dependent Claim
74 words
A capacitor as claimed in claim 1, characterized in that the doped barium-calcium-zirconium-titanate has the composition (Ba 0 .96-ν D.sub.ν Ca 0 .04) [Ti 1-x- δ-μ' Mn.sub.δ A'.sub.μ' Zr x ] z O 3 , where A is a member selected from the group consisting of Dy, Er, Ho, Y and Yb; D is a member selected from the group consisting of Nd, Pr, Sm and Gd; 0.10≦x ≦0.25; 0≦μ'≦0.01, 0≦ν≦0.01, 0<δ≦0.01 and 0.995≦z≦1.
Claim 4
Dependent Claim
58 words
A capacitor as claimed in claim 1, characterized in that the doped barium-calcium-zirconium-titanate has the composition (Ba 0 .96-μ-ν A 82 D.sub.ν Ca 0 .04)[Ti 1-x- δ Mn.sub.δ Zr x ] z O 3 , where A=Ag, D is a member selected from the group consisting of Nb, Pr, Sm an Gd; 0.10≦x≦0.25; 0≦μ≦0.01, 0≦ν≦0.01, 0<δ≦0.01 and 0.995≦z≦1.
Claim 5
Dependent Claim
46 words
A capacitor as claimed in claim 1, characterized in that the doped barium-calcium-zirconium-titanate has the composition (Ba 0 .96-μ A.sub.μ Ca 0 .04)[Ti 1-x- δ-ν' Mn.sub.δ D'.sub.ν' Zr x ] z O 3 , where A =Ag, D'=Nb or Mo, 0.10≦x≦0.25; 0≦μ≦0.01, 0≦ν'≦0.01, 0<δ≦0.01 and 0.995≦z≦1.
Claim 6
Dependent Claim
43 words
A capacitor as claimed in claim 1, characterized in that the doped barium-calcium-zirconium-titanate has the composition (Ba 0 .09575 Nd 0 .0025 Ca 0 .04)[Ti 0 .995-x Mn 0 .0025 Y 0 .0025 Zr x] z O 3 , where 0.18≦x≦0.22 and 0.995≦z≦0.999.
Claim 7
Dependent Claim
21 words
A capacitor as claimed in claim 1, characterized in that the material for the electrodes is nickel or a nickel alloy.
Claim 8
Dependent Claim
25 words
A capacitor as claimed in claim 1, characterized in that the capacitor is a multilayer capacitor comprising inner electrodes of nickel or a nickel alloy.
Claim 9
Dependent Claim
22 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.
References Cited (Backward Citations)
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