US4017320A
Expired / Lapsed
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Ceramic dielectric composition
Assignee: TDK Corp
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Filing: 1975-11-19
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Granted: 1977-04-12
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Expires: 1995-11-19
Abstract
Abstract A ceramic dielectric composition is provided including 30 to 94% by mol of SrTiO 3 , 1 to 22% by mol of Bi 2 O 3 and 5 to 69% by mol of TiO 2 , and further including 0.1 to 20% by weight of MgO with respect to the total weight of the above-mentioned three compounds SrTiO 3 , Bi 2 O 3 and TiO 2 , whereby the ceramic dielectric composition has a high dielectric constant and a low dielectric loss and further the variations of the dielectric constant and the dielectric loss with respect to the variation of an applied voltage, are respectively, very small.
Inventors
- 👤 Shinobu Fujiwara
- 👤 Hitoshi Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:39
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/02; H01B3/12; C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/47
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
165 words
A ceramic dielectric composition comprised of 30 to 94% by mol of SrTiO 3 , 1 to 22% by mol of Bi 2 O 3 and 5 to 69% by mol of TiO 2 , and 0.1 to 20% by weight of MgO based on the total weight of the above-mentioned three compounds SrTiO 3 , Bi 2 O 3 and TiO 2 , the amount of MgO being selected to provide a ceramic dielectric composition exhibiting reduced dielectric loss factor and reduced variation of the electrostatic capacity with respect to applied temperatures or voltages, as compared to a ceramic dielectric composition containing no MgO; and further including an amount ranging from 0.01 to 10% by weight of at least one of the oxides of the rare earth elements, said amount being selected to provide a ceramic dielectric compositon with reduced dielectric loss factor as compared to a ceramic dielectric composition which is otherwise the same but contains no oxide of the rare earth elements.
Claim 2
Dependent Claim
165 words
A ceramic dielectric composition comprised of 30 to 94% by mol of SrTiO 3 , 1 to 22% by mol of Bi 2 O 3 and 5 to 69% by mol of TiO 2 , and 0.1 to 20% by weight of MgO based on the total weight of the above-mentioned three compounds SrTiO 3 , Bi 2 O 3 and TiO 2 , the amount of MgO being selected to provide a ceramic dielectric composition exhibiting reduced dielectric loss factor and reduced variation of the electrostatic capacity with respect to applied temperatures or voltages, as compared to a ceramic dielectric composition containing no MgO; and further including an amount ranging from 0.01 to 10% by weight of at least one of the oxides of the rare earth elements, said amount being selected to provide a ceramic dielectric compositon with reduced dielectric loss factor as compared to a ceramic dielectric composition which is otherwise the same but contains no oxide of the rare earth elements.
Claim 3
Dependent Claim
29 words
A ceramic dielectric composition as set forth in claim 1 which further includes at least one of the following materials: clay or oxides of Mn, Cr, Fe, or Co.
Claim 4
Dependent Claim
120 words
A ceramic dielectric composition consisting essentially of 30 to 94% by mol of SrTiO 3 , 1 to 22% by mol of Bi 2 O 3 , 5 to 69% by mol of TiO 2 , and 0.1 to 2.4% by weight of MgO based on the total weight of the above-mentioned three compounds SrTiO 3 , Bi 2 O 3 , and TiO 2 , the amount of MgO being selected to provide a ceramic dielectric composition exhibiting reduced dielectric loss factor and reduced variation of the electrostatic capacity with respect to applied temperatures or voltages, as compared to a ceramic dielectric composition which is the same except for the presence of a greater or lesser amount of MgO.
Claim 5
Dependent Claim
120 words
A ceramic dielectric composition consisting essentially of 30 to 94% by mol of SrTiO 3 , 1 to 22% by mol of Bi 2 O 3 , 5 to 69% by mol of TiO 2 , and 0.1 to 2.4% by weight of MgO based on the total weight of the above-mentioned three compounds SrTiO 3 , Bi 2 O 3 , and TiO 2 , the amount of MgO being selected to provide a ceramic dielectric composition exhibiting reduced dielectric loss factor and reduced variation of the electrostatic capacity with respect to applied temperatures or voltages, as compared to a ceramic dielectric composition which is the same except for the presence of a greater or lesser amount of MgO.
Claim 6
Dependent Claim
86 words
A ceramic dielectric composition according to claim 3 containing less than 10% by weight, based on the total weight of the SrTiO 3 , the Bi 2 O 3 , the TiO 2 , and the MgO, of at least one member selected from the group consisting of the oxides of rare earth elements, the amount of said member being selected to provide a ceramic dielectric composition with reduced dielectric loss factor as compared to the same composition containing no oxide of a rare earth element.
Claim 7
Dependent Claim
25 words
A ceramic dielectric composition according to claim 4 wherein the amount of an oxide of a rare earth element is at least 0.01% by weight.
Claim 8
Dependent Claim
62 words
A ceramic dielectric composition according to claim 4, wherein said composition further contains 0.1 to 0.5% by weight, based on the total weight of the SrTiO 3 , the Bi 2 O 3 , the TiO 2 , and the MgO, of at least one member selected from the group consisting of clay and the oxides of Mn, Cr, Fe, and Co.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-11 | 1980-10-11 | 1981-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-11 | 1984-10-11 | 1985-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-11 | 1988-10-11 | 1989-04-12 | $7700.00 | Window Closed / Lapsed |