US4746639A
Expired / Lapsed
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Dielectric ceramic composition
Assignee: Murata Manufacturing Co Ltd
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Filing: 1987-06-12
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Granted: 1988-05-24
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Expires: 2007-06-12
Abstract
Abstract A dielectric ceramic composition consists essentially of a basic component composed of 35 to 70 wt % of SrTiO 3 , 0.5 to 16 wt % of MgTiO 3 , 1.0 to 12 wt % of CaTiO 3 , 5 to 32 wt % of Bi 2 O 3 and 5 to 16 wt % of TiO 2 , and additives composed of CuO, MnO 2 and CeO 2 . The contents of the additives per 100 parts by weight of the main component are 0.05 to 1.0 parts by weight for CuO, 0.02 to 0.5 parts by weight for MnO 2 , and 1.0 to 8.0 parts by weight for CeO 2 , respectively. The composition possesses a high dielectric constant of more than 500, a high Q value of more than 1000 at 1 MHz, a small temperature change rate of capacitance of a maximum of -7.2% at +85° C., and a small change rate of capacitance with direct current voltage.
Inventors
- 👤 Harunobu Sano
- 👤 Yukio Sakabe
- 👤 Goro Nishioka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:58
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/47
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
114 words
A dielectric ceramic composition consisting essentially of a basic component composed of 35 to 70 wt % of SrTiO 3 , 0.5 to 16 wt % of MgTiO 3 , 1.0 to 12 wt % of CaTiO 3 , 5 to 32 wt % of Bi 2 O 3 and 5 to 16 wt % of TiO 2 , and additives composed of CuO, MnO 2 and CeO 2 , the contents of said additives per 100 parts by weight of the main component being 0.05 to 1.0 parts by weight for CuO, 0.02 to 0.5 parts by weight for MnO 2 , and 1.0 to 8.0 parts by weight for CeO 2 .
Claim 2
Dependent Claim
114 words
A dielectric ceramic composition consisting essentially of a basic component composed of 35 to 70 wt % of SrTiO 3 , 0.5 to 16 wt % of MgTiO 3 , 1.0 to 12 wt % of CaTiO 3 , 5 to 32 wt % of Bi 2 O 3 and 5 to 16 wt % of TiO 2 , and additives composed of CuO, MnO 2 and CeO 2 , the contents of said additives per 100 parts by weight of the main component being 0.05 to 1.0 parts by weight for CuO, 0.02 to 0.5 parts by weight for MnO 2 , and 1.0 to 8.0 parts by weight for CeO 2 .
Claim 3
Dependent Claim
63 words
A dielectric ceramic composition according to claim 1 in which the basic component is composed of 38.3 to 69.8 weight % of SrTiO 3 , 0.5 to 15.8 weight % of MgTiO 3 , 1.1 to 9.6 weight % of CaTiO 3 , 14.8 to 32 weight % of Bi 2 O 3 and 5.1 to 15.5 weight % of TiO 2 .
Claim 4
Dependent Claim
44 words
A dielectric cermaic composition according to claim 2 in which the contents of said additives per 100 parts by weight of the main component is 0.05 to 0.8 parts by weight for CuO and 0.1 to 0.2 parts by weight for MnO 2 .
Claim 5
Dependent Claim
44 words
A dielectric ceramic composition according to claim 3 in which the contents of said additives per 100 parts by weight of the main component is 0.2 to 0.8 parts by weight for CuO and 1 to 5 parts by weight for CeO 2 .
Claim 6
Dependent Claim
98 words
A dielectric ceramic composition according to claim 4 in which the basic component is composed of 44.7 to 54.3 weight % of SrTiO 3 , 13.1 to 15.8 weight % of MgTiO 3 , 1.1 to 4.2 weight % of CaTiO 3 , 20.2 to 30 weight % of Bi 2 O 3 and 8.3 to 10.3 weight % of TiO 2 , and the contents of said additives per 100 parts by weight of the main component is 0.2 to 0.4 parts by weight for CuO and 0.1 to 0.15 parts by weight for MnO 2 .
Claim 7
Dependent Claim
44 words
A dielectric ceramic composition according to claim 1 in which the contents of said additives per 100 parts by weight of the main component is 0.05 to 0.8 parts by weight for CuO and 0.1 to 0.2 parts by weight for MnO 2 .
Claim 8
Dependent Claim
44 words
A dielectric ceramic composition according to claim 6 in which the contents of said additives per 100 parts by weight of the main component is 0.2 to 0.8 parts by weight for CuO and 1 to 5 parts by weight for CeO 2 .
References Cited (Backward Citations)
JPS5368899A
Cited
JPS53114812A
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US4388416A
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US4485181A
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US4482934A
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US4552853A
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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) | 1991-05-24 | 1991-11-23 | 1992-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-24 | 1995-11-23 | 1996-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-24 | 1999-11-23 | 2000-05-24 | $7700.00 | Window Closed / Lapsed |