US4640905A
Expired / Lapsed
US
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Dielectric compositions
Assignee: CERAMIC DIELECTRICS Inc A CORP OF
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Filing: 1986-01-07
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Granted: 1987-02-03
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Expires: 2006-01-07
Abstract
Abstract The invention is directed to barium titanate-based densified dielectric bodies corresponding to the formula (1-X)[(Ba.sub.1-x Pb.sub.x)(Ti.sub.1-(u+v) Zr.sub.u Sn.sub.v)O.sub.3 ]+X[A(Zn 1/3 Nb 2/3 )O 3 ]+Y[F], wherein A is selected from Pb, Ba and mixtures thereof. ______________________________________ X = 2.5 to 11.5% by weight, Y = 1.0 to 5.0% by weight, u = 0 to 0.125, v = 0 to 0.125, x = 0 to 0.125, u + v = 0.015 to 0.125, ______________________________________ F is a manganese-doped zinc borate flux.
Inventors
- 👤 Ian Burn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:47
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B35/63404; C04B35/63424; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682; C04B35/4684; C04B35/63444; H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1218; H01G4/1227; H01G4/1236; H01G4/1245
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
150 words
A composition for forming a densified dielectric body at low firing temperatures consisting essentially of a mixture of finely divided particles of: a. BaTiO 3 , b. A(Zn 1/3 Nb 2/3 )O 3 , c. A Curie point shifter selected from BaZrO 3 , PbZrO 3 , BaSnO 3 , PbSnO 3 and mixtures thereof, d. a manganese-doped metal borate flux (F) selected from zinc borates in which the ratio of ZnO to B 2 O 3 is 2-4 and mixtures and oxide precursors thereof, the proportions of a.-d. being substantially equivalent stoichiometrically to the formula: (1-X)[(Ba.sub.1-x Pb.sub.x)(Ti.sub.1-(u+v) Zr.sub.u Sn.sub.v)O.sub.3 ]+X[A(Zn.sub.1/3 Nb.sub.2/3)O.sub.3 ]+Y[F], wherein A is selected from Pb, Ba and mixtures thereof ______________________________________
X = 2.5 to 11.5% by weight,
Y = 1.0 to 5.0%
u = 0 to 0.125,
v = 0 to 0.125,
x = 0 to 0.125, and
u + v = 0.015 to 0.125.
______________________________________
Claim 2
Dependent Claim
150 words
A composition for forming a densified dielectric body at low firing temperatures consisting essentially of a mixture of finely divided particles of: a. BaTiO 3 , b. A(Zn 1/3 Nb 2/3 )O 3 , c. A Curie point shifter selected from BaZrO 3 , PbZrO 3 , BaSnO 3 , PbSnO 3 and mixtures thereof, d. a manganese-doped metal borate flux (F) selected from zinc borates in which the ratio of ZnO to B 2 O 3 is 2-4 and mixtures and oxide precursors thereof, the proportions of a.-d. being substantially equivalent stoichiometrically to the formula: (1-X)[(Ba.sub.1-x Pb.sub.x)(Ti.sub.1-(u+v) Zr.sub.u Sn.sub.v)O.sub.3 ]+X[A(Zn.sub.1/3 Nb.sub.2/3)O.sub.3 ]+Y[F], wherein A is selected from Pb, Ba and mixtures thereof ______________________________________
X = 2.5 to 11.5% by weight,
Y = 1.0 to 5.0%
u = 0 to 0.125,
v = 0 to 0.125,
x = 0 to 0.125, and
u + v = 0.015 to 0.125.
______________________________________
Claim 3
Dependent Claim
21 words
The composition of claim 1 which contains additionally 0.05-0.5% wt. manganese oxide as MnO 2 , BaMnO 3 or precursors thereof.
Claim 4
Dependent Claim
26 words
The composition of claim 1 in which c. is a mixture of PbZrO 3 and BaZrO 3 , and d. is 3ZnO.B 2 O 3 .
Claim 5
Dependent Claim
34 words
The composition of claim 3 in which up to 50 mole % of the B 2 O 3 is replaced by SiO 2 , GeO 2 , Al 2 O 3 or mixtures thereof.
Claim 6
Dependent Claim
31 words
A dielectric composition consisting essentially of the composition of claim 1 which has been fired in air at 1000°-1150° C. to effect sintering of the particles and densification of the mixture.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-02 | 1990-08-04 | 1991-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-02 | 1994-08-04 | 1995-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-02 | 1998-08-04 | 1999-02-03 | $7700.00 | Window Closed / Lapsed |