US4485181A
Expired / Lapsed
US
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Dielectric ceramic composition
Assignee: Murata Manufacturing Co Ltd
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Filing: 1983-06-16
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Granted: 1984-11-27
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Expires: 2003-06-16
Abstract
Abstract Dielectric ceramic composition containing by weight, 33% to 40% of PbTiO3; 6% to 35% of SrTiO3; 3% to 18% of CaTiO3; 0.5% to 10% of MgTiO3; 6% to 26% of Bi2O3; 3% to 15% of TiO2; 0.2% to 4% of ZnO; 0.2% to 5% of Nb2O5; 0.1% to 4% of CeO2 and 0.1% to 2% of Al2O3.
Inventors
- 👤 Yukio Sakabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:24
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/472; C04B35/465; C04B35/47; H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
106 words
A dielectric ceramic composition having a sintering temperature ranging from 1050° C. to 1160° C. comprising PbTiO 3 , SrTiO 3 , CaTiO 3 , MgTiO 3 , TiO 2 , Bi 2 O 3 , ZnO, Nb 2 O 5 , CeO 2 and Al 2 O 3 , wherein each constituent is present in the following amounts by weight: ______________________________________
PbTiO.sub.3 33% to 40%
SrTiO.sub.3 6% to 35%
CaTiO.sub.3 3% to 18%
MgTiO.sub.3 0.5% to 10%
Bi.sub.2 O.sub.3 6% to 26%
TiO.sub.2 3% to 15%
ZnO 0.2% to 4%
Nb.sub.2 O.sub.5 0.2% to 5%
CeO.sub.2 0.1% to 4%
Al.sub.2 O.sub.3 0.1% TO 2%
______________________________________
Claim 2
Dependent Claim
106 words
A dielectric ceramic composition having a sintering temperature ranging from 1050° C. to 1160° C. comprising PbTiO 3 , SrTiO 3 , CaTiO 3 , MgTiO 3 , TiO 2 , Bi 2 O 3 , ZnO, Nb 2 O 5 , CeO 2 and Al 2 O 3 , wherein each constituent is present in the following amounts by weight: ______________________________________
PbTiO.sub.3 33% to 40%
SrTiO.sub.3 6% to 35%
CaTiO.sub.3 3% to 18%
MgTiO.sub.3 0.5% to 10%
Bi.sub.2 O.sub.3 6% to 26%
TiO.sub.2 3% to 15%
ZnO 0.2% to 4%
Nb.sub.2 O.sub.5 0.2% to 5%
CeO.sub.2 0.1% to 4%
Al.sub.2 O.sub.3 0.1% TO 2%
______________________________________
Claim 3
Dependent Claim
108 words
A dielectric ceramic composition having a sintering temperature ranging from 1050° C. to 1160° C. consisting essentially of PbTiO 3 , SrTiO 3 , CaTiO 3 , MgTiO 3 , TiO 2 , Bi 2 O 3 , ZnO, Nb 2 O 5 , CeO 2 and Al 2 O 3 , wherein each constituent is present in the following amounts by weight: ______________________________________
PbTiO.sub.3 33% to 40%
SrTiO.sub.3 6% to 35%
CaTiO.sub.3 3% to 18%
MgTiO.sub.3 0.5% to 10%
Bi.sub.2 O.sub.3 6% to 26%
TiO.sub.2 3% to 15%
ZnO 0.2% to 4%
Nb.sub.2 O.sub.5 0.2% to 5%
CeO.sub.2 0.1% to 4%
Al.sub.2 O.sub.3 0.1% TO 2%
______________________________________
Claim 4
Dependent Claim
108 words
A dielectric ceramic composition having a sintering temperature ranging from 1050° C. to 1160° C. consisting essentially of PbTiO 3 , SrTiO 3 , CaTiO 3 , MgTiO 3 , TiO 2 , Bi 2 O 3 , ZnO, Nb 2 O 5 , CeO 2 and Al 2 O 3 , wherein each constituent is present in the following amounts by weight: ______________________________________
PbTiO.sub.3 33% to 40%
SrTiO.sub.3 6% to 35%
CaTiO.sub.3 3% to 18%
MgTiO.sub.3 0.5% to 10%
Bi.sub.2 O.sub.3 6% to 26%
TiO.sub.2 3% to 15%
ZnO 0.2% to 4%
Nb.sub.2 O.sub.5 0.2% to 5%
CeO.sub.2 0.1% to 4%
Al.sub.2 O.sub.3 0.1% TO 2%
______________________________________
Claim 5
Dependent Claim
41 words
The dielectric ceramic composition of claim 2 having a permittivity of at least 1000, a dielectric loss tangent of 1% or less, and a bias characteristic as a result of applying a direct-current voltage of 4 KV/mm of less than -20%.
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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) | 1987-11-27 | 1988-05-28 | 1988-11-27 | $2000.00 | Window Closed / Lapsed |
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