US4616289A
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US
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Ceramic high dielectric composition
Assignee: Panasonic Holdings Corp
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Filing: 1982-12-20
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Granted: 1986-10-07
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Expires: 2002-12-20
Abstract
Abstract PCT No. PCT/JP82/00472 Sec. 371 Date Aug. 17, 1983 Sec. 102(e) Date Aug. 17, 1983 PCT Filed Dec. 20, 1982 PCT Pub. No. WO83/02270 PCT Pub. Date Jul. 7, 1983.This invention relates to ceramic high dielectric composition with BaTiO3 as host component; and by containing 1-5 weight part of CaTiO3 and 2-3 weight parts of Ta2O5 to 100 weight parts of the BaTiO3, a composition having dielectric constant of 3000 or above, a small voltage dependency, a large bending strength and good high frequency characteristic is provided; and it has a good characteristic when used as thin film type dielectric body like laminated ceramic capacitor.
Inventors
- 👤 Gen Itakura
- 👤 Tadayoshi Ushijima
- 👤 Kenji Kusakabe
- 👤 Takayuki Kuroda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:55
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682; 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: 14
Claim 1
Independent Claim
136 words
In a ceramic composition having a high dielectric constant, said ceramic composition containing a host material, the improvement in which the host material consists essentially of: 1-5 parts by weight CaTiO 3 ; 2-3 parts by weight Ta 2 O 5 ; up to 0.2 by weight MnO 2 ; up to 0.5 by weight SiO 2 ; and the remainder is BaTiO 3 wherein each of the aforesaid parts by weight are parts by weight per 100 parts by weight BaTiO 3 , said ceramic composition having a dielectric constant ξ 25 of at least 3,000 measured at 25° C. with a 1 KHz at 1 VAC, a voltage dependency tan δ not more than 2.0 measured at an effective voltage of 50 V/mm and a bending strength of at least 690 Kg/cm 2 .
Claim 2
Dependent Claim
136 words
In a ceramic composition having a high dielectric constant, said ceramic composition containing a host material, the improvement in which the host material consists essentially of: 1-5 parts by weight CaTiO 3 ; 2-3 parts by weight Ta 2 O 5 ; up to 0.2 by weight MnO 2 ; up to 0.5 by weight SiO 2 ; and the remainder is BaTiO 3 wherein each of the aforesaid parts by weight are parts by weight per 100 parts by weight BaTiO 3 , said ceramic composition having a dielectric constant ξ 25 of at least 3,000 measured at 25° C. with a 1 KHz at 1 VAC, a voltage dependency tan δ not more than 2.0 measured at an effective voltage of 50 V/mm and a bending strength of at least 690 Kg/cm 2 .
Claim 3
Dependent Claim
131 words
In a ceramic composition having a high dielectric constant, said ceramic composition containing a host material, the improvement in which the host material consists essentially of: 1-5 parts by weight CaTiO 3 ; 1-4 parts by weight Ta 2 O 5 ; 1-4 parts by weight Gd 2 O 3 ; and the remainder is BaTiO 3 , wherein each of the foresaid parts by weight are parts by weight per 100 parts by weight of BaTiO 3 , said ceramic composition having a dielectric constant ξ 25 of at least 3,000 measured at 25° C. with a 1 KHz at 1 VAC, a voltage dependency tan δ not more than 2.0 measured at an effective voltage of 50 V/mm and a bending strength of at least 690 Kg/cm 2 .
Claim 4
Dependent Claim
131 words
In a ceramic composition having a high dielectric constant, said ceramic composition containing a host material, the improvement in which the host material consists essentially of: 1-5 parts by weight CaTiO 3 ; 1-4 parts by weight Ta 2 O 5 ; 1-4 parts by weight Gd 2 O 3 ; and the remainder is BaTiO 3 , wherein each of the foresaid parts by weight are parts by weight per 100 parts by weight of BaTiO 3 , said ceramic composition having a dielectric constant ξ 25 of at least 3,000 measured at 25° C. with a 1 KHz at 1 VAC, a voltage dependency tan δ not more than 2.0 measured at an effective voltage of 50 V/mm and a bending strength of at least 690 Kg/cm 2 .
Claim 5
Dependent Claim
27 words
The ceramic composition of claim 2 which further includes from 0.01 to 0.5 weight percent of at least one oxide of Mn, Cr, Fe, Ni or Co.
Claim 6
Dependent Claim
129 words
In a ceramic composition having a high dielectric constant, said ceramic composition containing a host material, the improvement in which the host material consists essentially of: 1-5 parts by weight CaTiO 3 ; 1-4 parts by weight Ta 2 O 5 ; 1-4 parts by weight Nd 2 O 3 ; and the remainder is BaTiO 3 , wherein each of the parts by weight are parts by weight per 100 parts by weight BaTiO 3 , said ceramic composition having a dielectric constant ξ 25 of at least 3,000 measured at 25° C. with a 1 KHz at 1 VAC, a voltage dependency tan δ not more than 2.0 measured at an effective voltage of 50 V/mm and a bending strength of at least 690 Kg/cm 2 .
Claim 7
Dependent Claim
129 words
In a ceramic composition having a high dielectric constant, said ceramic composition containing a host material, the improvement in which the host material consists essentially of: 1-5 parts by weight CaTiO 3 ; 1-4 parts by weight Ta 2 O 5 ; 1-4 parts by weight Nd 2 O 3 ; and the remainder is BaTiO 3 , wherein each of the parts by weight are parts by weight per 100 parts by weight BaTiO 3 , said ceramic composition having a dielectric constant ξ 25 of at least 3,000 measured at 25° C. with a 1 KHz at 1 VAC, a voltage dependency tan δ not more than 2.0 measured at an effective voltage of 50 V/mm and a bending strength of at least 690 Kg/cm 2 .
Claim 8
Dependent Claim
27 words
The ceramic composition of claim 4 which further includes from 0.01 to 0.5 weight percent of at least one oxide of Mn, Cr, Fe, Ni or Co.
Claim 9
Dependent Claim
130 words
In a ceramic composition having a high dielectric constant, said ceramic composition containing a host material, the improvement in which the host material consists essentially of: 1-5 parts by weight CaTiO 3 ; 1-4 parts by weight Ta 2 O 5 ; 1-4 parts by weight LA 2 O 3 ; and the remainder is BaTiO 3 , wherein each of the aforesaid parts by weight are parts by weight per 100 parts by weight BaTiO 3 , said ceramic composition having a dielectric constant ξ 25 of at least 3,000 measured at 25° C. with a 1 KHz at 1 VAC, a voltage dependency tan δ not more than 2.0 measured at an effective voltage of 50 V/mm and a bending strength of at least 690 Kg/cm 2 .
Claim 10
Dependent Claim
130 words
In a ceramic composition having a high dielectric constant, said ceramic composition containing a host material, the improvement in which the host material consists essentially of: 1-5 parts by weight CaTiO 3 ; 1-4 parts by weight Ta 2 O 5 ; 1-4 parts by weight LA 2 O 3 ; and the remainder is BaTiO 3 , wherein each of the aforesaid parts by weight are parts by weight per 100 parts by weight BaTiO 3 , said ceramic composition having a dielectric constant ξ 25 of at least 3,000 measured at 25° C. with a 1 KHz at 1 VAC, a voltage dependency tan δ not more than 2.0 measured at an effective voltage of 50 V/mm and a bending strength of at least 690 Kg/cm 2 .
Claim 11
Dependent Claim
27 words
The ceramic composition of claim 6 which further includes from 0.01 to 0.5 weight percent of at least one oxide of Mn, Cr, Fe, Ni or Co.
Claim 12
Dependent Claim
126 words
A ceramic composition having a high dielectric constant and containing BaTiO 3 as host material, the improvement in which the host material consists essentially of: 1-5 parts by weight of CaTiO 3 ; 2-3 parts by weight of Ta 2 O 5 ; and the remainder of the host material is BaTiO 3 , wherein each of the aforesaid parts by weight are parts by weight per 100 parts by weight of BaTiO 3 , said ceramic compostion having a dielectric constant ξ 25 of at least 3,000 measured at 25° C. with a 1 KHz at 1 VAC, a voltage dependency tan δ not more than 2.0 measured at an effective voltage of 50/V/mm and a bending strength of at least 690 Kg/cm 2 .
Claim 13
Dependent Claim
126 words
A ceramic composition having a high dielectric constant and containing BaTiO 3 as host material, the improvement in which the host material consists essentially of: 1-5 parts by weight of CaTiO 3 ; 2-3 parts by weight of Ta 2 O 5 ; and the remainder of the host material is BaTiO 3 , wherein each of the aforesaid parts by weight are parts by weight per 100 parts by weight of BaTiO 3 , said ceramic compostion having a dielectric constant ξ 25 of at least 3,000 measured at 25° C. with a 1 KHz at 1 VAC, a voltage dependency tan δ not more than 2.0 measured at an effective voltage of 50/V/mm and a bending strength of at least 690 Kg/cm 2 .
Claim 14
Dependent Claim
49 words
A ceramic capacitor consisting of a ceramic dielectric body formed by the ceramic composition of claim 8 having a plurality of internal electrodes therein and a pair of external electrodes attached to the surface of the dielectric body each external electrode in electrical contact with alternating adjacent inner electrodes.
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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) | 1989-10-06 | 1990-04-07 | 1990-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-06 | 1994-04-07 | 1994-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-06 | 1998-04-07 | 1998-10-07 | $7700.00 | Window Closed / Lapsed |