US5084424A
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Ceramic dielectrics and compositions therefor
Assignee: Sakai Chemical Industry Co Ltd
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Filing: 1991-01-16
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Granted: 1992-01-28
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Expires: 2011-01-16
Abstract
Abstract A composition for producing ceramic dielectrics which comprises: a mixture of barium titanate which has average particle size of 0.1-1.5 μm is amounts of 98-60 mole % and a perovskite type barium titanate solid solution which has average particle size of 0.1-1.5 μm and a Curie temperature of 50°-115° C. in amounts of 2-40 mole %; and (A) at least one of niobium oxides and tantalum oxides in amounts of 0.3-2 moles % in relation to 100 mole % of the mixture; and (B) at least one of cobalt oxides, nickel oxides, magnesium oxides, manganese oxides, copper oxides and oxides of a rare earth metal in amounts of 0.1-2 moles % in relation to 100 mole % of the mixture. The composition provides a ceramic dielectric which has a large relative permittivity and still has a small temperature dependence of relative permittivity within ±15% over a temperature range between -55° C. and +125° C. taking a relative permittivity at 20° C. as a standard.
Inventors
- 👤 Kazunobu Abe
- 👤 Masashi Aoki
- 👤 Kazuhisa Hidaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:48
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682; C04B35/48; C04B35/49; H; H01; H01B; H01B3/00; H01B3/02; H01B3/12; 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: 8
Claim 1
Independent Claim
120 words
A composition for producing ceramic dielectrics which comprises: a mixture of barium titanate which has average particle size of 0.1-1.5 μm in amounts of 98-60 mole % and a perovskite structure barium titanate solid solution which has average particle size of 0.1-1.5 μm and a Curie temperature of 50°-115° C. in amounts of 2-40 mole %; and (A) at least one of niobium oxides and tantalum oxides in amounts of 0.3-2 moles % in relation to 100 mole % of the mixture; and (B) at least one of cobalt oxides, nickel oxides, magnesium oxides, manganese oxides, copper oxides and oxides of a rare earth metal in amounts of 0.1-2 mole % in relation to 100 mole % of the mixture.
Claim 2
Dependent Claim
120 words
A composition for producing ceramic dielectrics which comprises: a mixture of barium titanate which has average particle size of 0.1-1.5 μm in amounts of 98-60 mole % and a perovskite structure barium titanate solid solution which has average particle size of 0.1-1.5 μm and a Curie temperature of 50°-115° C. in amounts of 2-40 mole %; and (A) at least one of niobium oxides and tantalum oxides in amounts of 0.3-2 moles % in relation to 100 mole % of the mixture; and (B) at least one of cobalt oxides, nickel oxides, magnesium oxides, manganese oxides, copper oxides and oxides of a rare earth metal in amounts of 0.1-2 mole % in relation to 100 mole % of the mixture.
Claim 3
Dependent Claim
229 words
A composition for producing ceramic dielectrics which comprises: a mixture of barium titanate which has average particle size of 0.1-1.5 μm in amounts of 98-60 mole % and a perovskite structure barium titanate solid solution which has average particle size of 0.1-1.5 μm and a Curie temperature of 50°-115° C. in amounts of 2-40 mole %; the perovskite structure barium titanate solid solution being: (a) a barium titanate zirconate solid solution represented by the general formula (I): BaTi.sub.1-x Zr.sub.x O.sub.3 wherein x is a numeral defined as 0.02≦x≦0.15, or (b) a barium strontium titanate solid solution represented by the general formula (II): Ba.sub.1-y Sr.sub.y TiO.sub.3 wherein y is a numeral defined as 0.03≦y≦0.20, or (c) a barium titanate stannate solid solution represented by the general formula (III): BaTi.sub.1-z Sn.sub.z O.sub.3 wherein z is a numeral defined as 0.01≦z≦0.10, (d) a complex solid solution of two or more of the above solid solutions, or (e) a mixture of two or more of the above solid solutions, and; (A) at least one of niobium oxides and tantalum oxides in amounts of 0.3-2 moles % in relation to 100 mole % of the mixture; and (B) at least one of cobalt oxides, nickel oxides, magnesium oxides, manganese oxides, copper oxides and oxides of a rare earth metal in amounts of 0.1-2 mole % in relation to 100 mole % of the mixture.
Claim 4
Dependent Claim
229 words
A composition for producing ceramic dielectrics which comprises: a mixture of barium titanate which has average particle size of 0.1-1.5 μm in amounts of 98-60 mole % and a perovskite structure barium titanate solid solution which has average particle size of 0.1-1.5 μm and a Curie temperature of 50°-115° C. in amounts of 2-40 mole %; the perovskite structure barium titanate solid solution being: (a) a barium titanate zirconate solid solution represented by the general formula (I): BaTi.sub.1-x Zr.sub.x O.sub.3 wherein x is a numeral defined as 0.02≦x≦0.15, or (b) a barium strontium titanate solid solution represented by the general formula (II): Ba.sub.1-y Sr.sub.y TiO.sub.3 wherein y is a numeral defined as 0.03≦y≦0.20, or (c) a barium titanate stannate solid solution represented by the general formula (III): BaTi.sub.1-z Sn.sub.z O.sub.3 wherein z is a numeral defined as 0.01≦z≦0.10, (d) a complex solid solution of two or more of the above solid solutions, or (e) a mixture of two or more of the above solid solutions, and; (A) at least one of niobium oxides and tantalum oxides in amounts of 0.3-2 moles % in relation to 100 mole % of the mixture; and (B) at least one of cobalt oxides, nickel oxides, magnesium oxides, manganese oxides, copper oxides and oxides of a rare earth metal in amounts of 0.1-2 mole % in relation to 100 mole % of the mixture.
Claim 5
Dependent Claim
231 words
A ceramic dielectric which produced by sintering a composition comprises: a mixture of barium titanate which has average particle size of 0.1-1.5 μm in amounts of 98-60 mole % and a perovskite type barium titanate solid solution which has average particle size of 0.1-1.5 μm and a Curie temperature of 50°-115° C. in amounts of 2-40 mole %; the perovskite type barium titanate solid solution being: (a) a barium titanate zirconate solid solution represented by the general formula (I): BaTi.sub.1-x Zr.sub.x O.sub.3 wherein x is a numeral defined as 0.02≦x≦0.15, or (b) a barium strontium titanate solid solution represented by the general formula (II): Ba.sub.1-y Sr.sub.y TiO.sub.3 wherein y is a numeral defined as 0.03≦y≦0.20, or (c) a barium titanate stannate solid solution represented by the general formula (III): BaTi.sub.1-z Sn.sub.z O.sub.3 wherein z is a numeral defined as 0.01≦z≦0.10, (d) a complex solid solution of two or more of the above solid solutions, or (e) a mixture of two or more of the above solid solutions, and; (A) at least one of niobium oxides and tantalum oxides in amounts of 0.3-2 moles % in relation to 100 mole % of the mixture; and (B) at least one of cobalt oxides, nickel oxides, magnesium oxides, manganese oxides, copper oxides and oxides of a rare earth metal in amounts of 0.1-2 mole % in relation to 100 mole % of the mixture.
Claim 6
Dependent Claim
231 words
A ceramic dielectric which produced by sintering a composition comprises: a mixture of barium titanate which has average particle size of 0.1-1.5 μm in amounts of 98-60 mole % and a perovskite type barium titanate solid solution which has average particle size of 0.1-1.5 μm and a Curie temperature of 50°-115° C. in amounts of 2-40 mole %; the perovskite type barium titanate solid solution being: (a) a barium titanate zirconate solid solution represented by the general formula (I): BaTi.sub.1-x Zr.sub.x O.sub.3 wherein x is a numeral defined as 0.02≦x≦0.15, or (b) a barium strontium titanate solid solution represented by the general formula (II): Ba.sub.1-y Sr.sub.y TiO.sub.3 wherein y is a numeral defined as 0.03≦y≦0.20, or (c) a barium titanate stannate solid solution represented by the general formula (III): BaTi.sub.1-z Sn.sub.z O.sub.3 wherein z is a numeral defined as 0.01≦z≦0.10, (d) a complex solid solution of two or more of the above solid solutions, or (e) a mixture of two or more of the above solid solutions, and; (A) at least one of niobium oxides and tantalum oxides in amounts of 0.3-2 moles % in relation to 100 mole % of the mixture; and (B) at least one of cobalt oxides, nickel oxides, magnesium oxides, manganese oxides, copper oxides and oxides of a rare earth metal in amounts of 0.1-2 mole % in relation to 100 mole % of the mixture.
Claim 7
Independent Claim
241 words
A method of producing a ceramic dielectric which comprises: sintering a composition at temperatures of 1000°-1400° C., the composition comprising: a mixture of barium titanate which has average particle size of 0.1-1.5 μm in amounts of 98-60 mole % and a perovskite structure barium titanate solid solution which has average particle size of 0.1-1.5 μm and a Curie temperature of 50°-115° C. in amounts of 2-40 mole %; the perovskite structure barium titanate solid solution being: (a) a barium titanate zirconate solid solution represented by the general formula (I): BaTi.sub.1-x Zr.sub.x O.sub.3 wherein x is a numeral defined as 0.02≦x≦0.15, or (b) a barium strontium titanate solid solution represented by the general formula (II): Ba.sub.1-y Sr.sub.y TiO.sub.3 wherein y is a numeral defined as 0.03≦y≦0.20, or (c) a barium titanate stannate solid solution represented by the general formula (III): BaTi.sub.1-z Sn.sub.z O.sub.3 wherein z is a numeral defined as 0.01≦z≦0.10, (d) a complex solid solution of two or more of the above solid solutions, or (e) a mixture of two or more of the above solid solutions, and; (A) at least one of niobium oxides and tantalum oxides in amounts of 0.3-2 moles % in relation to 100 mole % of the mixture; and (B) at least one of cobalt oxides, nickel oxides, magnesium oxides, manganese oxides, copper oxides and oxides of a rare earth metal in amounts of 0.1-2 mole % in relation to 100 mole % of the mixture.
Claim 8
Independent Claim
241 words
A method of producing a ceramic dielectric which comprises: sintering a composition at temperatures of 1000°-1400° C., the composition comprising: a mixture of barium titanate which has average particle size of 0.1-1.5 μm in amounts of 98-60 mole % and a perovskite structure barium titanate solid solution which has average particle size of 0.1-1.5 μm and a Curie temperature of 50°-115° C. in amounts of 2-40 mole %; the perovskite structure barium titanate solid solution being: (a) a barium titanate zirconate solid solution represented by the general formula (I): BaTi.sub.1-x Zr.sub.x O.sub.3 wherein x is a numeral defined as 0.02≦x≦0.15, or (b) a barium strontium titanate solid solution represented by the general formula (II): Ba.sub.1-y Sr.sub.y TiO.sub.3 wherein y is a numeral defined as 0.03≦y≦0.20, or (c) a barium titanate stannate solid solution represented by the general formula (III): BaTi.sub.1-z Sn.sub.z O.sub.3 wherein z is a numeral defined as 0.01≦z≦0.10, (d) a complex solid solution of two or more of the above solid solutions, or (e) a mixture of two or more of the above solid solutions, and; (A) at least one of niobium oxides and tantalum oxides in amounts of 0.3-2 moles % in relation to 100 mole % of the mixture; and (B) at least one of cobalt oxides, nickel oxides, magnesium oxides, manganese oxides, copper oxides and oxides of a rare earth metal in amounts of 0.1-2 mole % in relation to 100 mole % of the mixture.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1995-01-27 | 1995-07-29 | 1996-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-27 | 1999-07-29 | 2000-01-28 | $3760.00 | Window Closed / Lapsed |
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