Patent US4339544A successfully refreshed from Google Patents.
US4339544A
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Ceramic dielectric composition
Assignee: Murata Manufacturing Co Ltd
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Filing: 1981-07-17
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Granted: 1982-07-13
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Expires: 2001-07-17
Abstract
Abstract A ceramic dielectric composition of a ternary system Pb(Mg 1/3 Nb 2/3 )O 3 -Pb(Zn 1/3 Nb 2/3 )O 3 -PbTiO 3 , comprising 69.05-69.60% by weight of Pb 3 O 4 , 2.41-4.00% by weight of MgO, 0.08-3.15% by weight of ZnO, 24.01-26.66% by weight of Nb 2 O 5 and 0.13-2.59% by weight of TiO 2 . The composition can be sintered at a low firing temperature less than 1,150° C., and has a high dielectric constant above 10,000.
Inventors
- 👤 Yukio Sakabe
- 👤 Yukio Hamaji
- 👤 Hiroshi Komatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:50
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/495; C04B35/497; C04B35/499; H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1254
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
120 words
A ceramic dielectric composition of a ternary system Pb(Mg 1/3 Nb 2/3 )O 3 -Pb(Zn 1/3 Nb 2/3 )O 3 -PbTiO 3 , comprising: 68.05-69.60% by weight of Pb 3 O 4 ; 2.41-4.00% by weight of MgO; 0.08-3.15% by weight of ZnO; 24.01-26.66% by weight of Nb 2 O 5 ; and 0.13-2.59% by weight of TiO 2 ; and the percentages by weight of said composition, [Pb(Mg 1/3 Nb 2/3 )O 3 , Pb(Zn 1/3 Nb 2/3 )O 3 , PbTiO 3 ], falling within the region enclosed by the lines joining four points of A(89.0, 1.0, 10.0), B(80.0, 10.0, 10.0), C(59.5, 40.0, 0.5) and D(98.5, 1.0, 0.5) in a diagram showing the proportions of the ternary system.
Claim 2
Dependent Claim
120 words
A ceramic dielectric composition of a ternary system Pb(Mg 1/3 Nb 2/3 )O 3 -Pb(Zn 1/3 Nb 2/3 )O 3 -PbTiO 3 , comprising: 68.05-69.60% by weight of Pb 3 O 4 ; 2.41-4.00% by weight of MgO; 0.08-3.15% by weight of ZnO; 24.01-26.66% by weight of Nb 2 O 5 ; and 0.13-2.59% by weight of TiO 2 ; and the percentages by weight of said composition, [Pb(Mg 1/3 Nb 2/3 )O 3 , Pb(Zn 1/3 Nb 2/3 )O 3 , PbTiO 3 ], falling within the region enclosed by the lines joining four points of A(89.0, 1.0, 10.0), B(80.0, 10.0, 10.0), C(59.5, 40.0, 0.5) and D(98.5, 1.0, 0.5) in a diagram showing the proportions of the ternary system.
Claim 3
Dependent Claim
146 words
A high capacitance capacitor including a ceramic dielectric composition of a ternary system Pb(Mg 1/3 Nb 2/3 )O 3 -Pb(Zn 1/3 Nb 2/3 )O 3 -PbTiO 3 which can be fired at a temperature below 1,150° C. and which has a dielectric constant of at least 10,000, said composition comprising: 68.05-69.60% by weight of Pb 3 O 4 ; 2.41-4.00% by weight of MgO; 0.08-3.15% by weight of ZnO; 24.01-26.66% by weight of Nb 2 O 5 ; and 0.13-2.59% by weight of TiO 2 ; and the percentages by weight of said composition, [Pb(Mg 1/3 Nb 2/3 )O 3 , Pb(Zn 1/3 Nb 2/3 )O 3 , PbTiO 3 ], falling within the region enclosed by the lines joining four points of A(89.0, 1.0, 10.0), B(80.0, 10.0, 10.0), C(59.5, 40.0, 0.5) and D(98.5, 1.0, 0.5) in a diagram showing the proportions of the ternary system.
Claim 4
Dependent Claim
146 words
A high capacitance capacitor including a ceramic dielectric composition of a ternary system Pb(Mg 1/3 Nb 2/3 )O 3 -Pb(Zn 1/3 Nb 2/3 )O 3 -PbTiO 3 which can be fired at a temperature below 1,150° C. and which has a dielectric constant of at least 10,000, said composition comprising: 68.05-69.60% by weight of Pb 3 O 4 ; 2.41-4.00% by weight of MgO; 0.08-3.15% by weight of ZnO; 24.01-26.66% by weight of Nb 2 O 5 ; and 0.13-2.59% by weight of TiO 2 ; and the percentages by weight of said composition, [Pb(Mg 1/3 Nb 2/3 )O 3 , Pb(Zn 1/3 Nb 2/3 )O 3 , PbTiO 3 ], falling within the region enclosed by the lines joining four points of A(89.0, 1.0, 10.0), B(80.0, 10.0, 10.0), C(59.5, 40.0, 0.5) and D(98.5, 1.0, 0.5) in a diagram showing the proportions of the ternary system.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 7.5 Years (Year 8) | 1989-07-12 | 1990-01-11 | 1990-07-13 | $3760.00 | Window Closed / Lapsed |
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