EP0033979A2
Expired / Lapsed
EP
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Thick film silver compositions for silver terminations for reduced barium titanate capacitors
Assignee: EIDP Inc
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Filing: 1981-02-12
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Granted: —
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Expires: 2001-02-12
Abstract
Abstract Thick film silver compositions, containing silver powder, glass and certain inorganic materials, useful for silver terminations for reduced barium titanate (RBT) capacitors, are provided. The inorganic materials or their precursors contain ions capable of substituting into the BaTiO 3 lattice, existing as surface layers on the RBT bodies, or grains therein, to produce (Bai-xM' x ) (Tii-yM"y) (0 3 -zA z ) where x < 1, y < 1, and z < 0.1. When terminated with these thick film silver compositions, RBT capacitors have excellent dielectric properties.
Inventors
- 👤 K. Manikantan Nair
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 15:27
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/005; H01G4/008; H01G4/0085; C; C22; C22C; C22C32/00; C22C32/0089
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
137 words
A thick film silver composition consisting essentially of a dispersion in an organic vehicle of (A) 30-90 parts by weight, based on the weight of the dispersion, of silver powder; (B) 1-20 parts by weight, based on the weight of the dispersion, of glass having a softening point below 600°C and an absolute viscosity at the firing temperature of less than 10 6 ; and (C) 0.1-30 parts by weight, based on the weight of the dispersion, of inorganic material or precursor thereof capable of substituting into a BaTi0 3 lattice existing as surface layers on reduced barium titanate to produce (Ba 1-x M' x )(Ti 1-y M" y )(O 3-z A z ) wherein x<1, y<1 and z<0.1, and wherein the inorganic material or precursor thereof contains at least one of M', M" and A ions.
Claim 2
Dependent Claim
137 words
A thick film silver composition consisting essentially of a dispersion in an organic vehicle of (A) 30-90 parts by weight, based on the weight of the dispersion, of silver powder; (B) 1-20 parts by weight, based on the weight of the dispersion, of glass having a softening point below 600°C and an absolute viscosity at the firing temperature of less than 10 6 ; and (C) 0.1-30 parts by weight, based on the weight of the dispersion, of inorganic material or precursor thereof capable of substituting into a BaTi0 3 lattice existing as surface layers on reduced barium titanate to produce (Ba 1-x M' x )(Ti 1-y M" y )(O 3-z A z ) wherein x<1, y<1 and z<0.1, and wherein the inorganic material or precursor thereof contains at least one of M', M" and A ions.
Claim 3
Dependent Claim
17 words
The composition of Claim 1 wherein the silver powder is present to the extent of 45-70 parts.
Claim 4
Dependent Claim
17 words
The composition of Claim 1 wherein the glass is present to the extent of 1-10 parts parts.
Claim 5
Dependent Claim
11 words
The composition of Claim 1-wherein the glass is lead bismuth borate.
Claim 6
Dependent Claim
15 words
The composition of Claim 1 wherein the precursor of the inorganic material is devitrifiable glass.
Claim 7
Dependent Claim
12 words
The composition of Claim 5 wherein the devitrifiable glass is lead germinate.
Claim 8
Dependent Claim
15 words
The composition of Claim 5 wherein the devitrifable glass is present together with-the- inorganic material.
Claim 9
Dependent Claim
62 words
The composition of Claim 1, wherein M' is selected from the group consisting of Ca +2 , Sr +2 , Ba +2 , Pb +2 , Rb +2 , Cs +2 and Fe +3 ; M" is selected from the group consisting of Ge +4 , Zr +4 , Ti+4, Zn +2 and Cr +3 ; and A is F - .
Claim 10
Dependent Claim
137 words
A thick film silver composition consisting essentially of a dispersion in an organic vehicle of (A) 45-70 parts by weight, based on the light of the dispersion, of silver powder; (B) 1-10 parts by weight, based on the whight of the dispersion, of glass having a softening point below 600°C and a specific viscosity at the firing temperature of less than 6; and (C) 1-10 parts by weight, based on the weight of the dispersion, of inorganic material or precursor thereof capable of substituting into a BaTiO 3 lattice existing as surface layers on reduced barium titanate to produce (Ba 1-x M x ) (Ti 1-y M y ) (O 3-z A z ) wherein x<1, y<1, and z<0.1, and wherein the inorganic material or precursor thereof contains at least one of M', M" and A ions.
Claim 11
Dependent Claim
137 words
A thick film silver composition consisting essentially of a dispersion in an organic vehicle of (A) 45-70 parts by weight, based on the light of the dispersion, of silver powder; (B) 1-10 parts by weight, based on the whight of the dispersion, of glass having a softening point below 600°C and a specific viscosity at the firing temperature of less than 6; and (C) 1-10 parts by weight, based on the weight of the dispersion, of inorganic material or precursor thereof capable of substituting into a BaTiO 3 lattice existing as surface layers on reduced barium titanate to produce (Ba 1-x M x ) (Ti 1-y M y ) (O 3-z A z ) wherein x<1, y<1, and z<0.1, and wherein the inorganic material or precursor thereof contains at least one of M', M" and A ions.
Claim 12
Dependent Claim
13 words
A reduced barium titanate capacitor terminated with the silver composition of Claim 1.
References Cited (Backward Citations)
No citation records indexed.
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