US4753905A
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Dielectric ceramic composition
Assignee: Murata Manufacturing Co Ltd
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Filing: 1986-07-29
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Granted: 1988-06-28
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Expires: 2006-07-29
Abstract
Abstract A dielectric ceramic composition consists essentially of a main component composed of a solid solution of a three component system Pb(Mg 1/3 Nb 2/3 )O 3 -Pb(Zn 1/3 Nb 2/3 )O 3 -PbTiO 3 , characterized in that said main component consists essentially of 68.05 to 69.60 wt % of Pb 3 O 4 , 2.41 to 4.00 wt % of MgO, 0.08 to 3.15 wt % of ZnO, 24.01 to 26.66 wt % of Nb 2 O 5 , and 0.13 to 2.59 wt % of TiO 2 , and has a set of compositional proportions of the three components falling within an area defined by a polygon ABCD encompassed by points A, B, C, and D in FIG. 1, and that a subsidiary component consisting essentially of MgO is incorporated into said main component in an amount of not more than 1.0 part by weight (except 0 part by weight) with respect to 100 part by weight of the main component. The composition may further contain, as a part of the subsidiary component, manganese and/or a compound represented by the general formula: A(Cu 1/2 W 1/2 )O 3 (wherein A is one or more elements selected from the group consisting of Pb, Ba, Sr, and Ca).
Inventors
- 👤 Goro Nishioka
- 👤 Yukio Sakabe
- 👤 Junichi Imanari
- 👤 Masaru Fujino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:06
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; H01G4/1263
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
225 words
A dielectric ceramic composition consisting mainly of a main component composed of a solid solution of a three component system Pb(Mg 1/3 Nb 2/3 )O 3 -Pb(Zn 1/3 Nb 2/3 )O 3 -PbTiO 3 , characterized in that said main component consists essentially of 68.05 to 69.60 wt% of Pb 3 O 4 , 2.41 to 4.00 wt% of MgO, 0.08 to 3.15 wt% of ZnO, 24.01 to 26.66 wt% of Nb 2 O 5 , and 0.13 to 2.59 wt% of TiO 2 , and has a set of compositional proportions of the three components, Pb(Mg 1/3 Nb 2/3 )O 3 , Pb(Zn 1/3 Nb 2/3 )O 3 , and PbTiO 3 , falling within an area defined by a polygon ABCD encompassed by points A, B, C, and D in FIG. 1, the sets of proportions of the three components at the vertices A, B, C, and D of the polygon being in weight % as follows: ______________________________________
Pb(Mg.sub.1/3 Nb.sub.2/3)O.sub.3
Pb(Zn.sub.1/3 Nb.sub.2/3)O.sub.3
PbTiO.sub.3
______________________________________
A 89.0 1.0 10.0
B 80.0 10.0 10.0
C 59.5 40.0 0.5
D 98.5 1.0 0.5
______________________________________ and that a subsidiary component consisting essentially of MgO is incorporated into said main component in an amount of not more than 1.0 part by weight (except 0 part by weight) with respect to 100 part by weight of the main component.
Claim 2
Dependent Claim
225 words
A dielectric ceramic composition consisting mainly of a main component composed of a solid solution of a three component system Pb(Mg 1/3 Nb 2/3 )O 3 -Pb(Zn 1/3 Nb 2/3 )O 3 -PbTiO 3 , characterized in that said main component consists essentially of 68.05 to 69.60 wt% of Pb 3 O 4 , 2.41 to 4.00 wt% of MgO, 0.08 to 3.15 wt% of ZnO, 24.01 to 26.66 wt% of Nb 2 O 5 , and 0.13 to 2.59 wt% of TiO 2 , and has a set of compositional proportions of the three components, Pb(Mg 1/3 Nb 2/3 )O 3 , Pb(Zn 1/3 Nb 2/3 )O 3 , and PbTiO 3 , falling within an area defined by a polygon ABCD encompassed by points A, B, C, and D in FIG. 1, the sets of proportions of the three components at the vertices A, B, C, and D of the polygon being in weight % as follows: ______________________________________
Pb(Mg.sub.1/3 Nb.sub.2/3)O.sub.3
Pb(Zn.sub.1/3 Nb.sub.2/3)O.sub.3
PbTiO.sub.3
______________________________________
A 89.0 1.0 10.0
B 80.0 10.0 10.0
C 59.5 40.0 0.5
D 98.5 1.0 0.5
______________________________________ and that a subsidiary component consisting essentially of MgO is incorporated into said main component in an amount of not more than 1.0 part by weight (except 0 part by weight) with respect to 100 part by weight of the main component.
Claim 3
Dependent Claim
51 words
The dielectric ceramic composition according to claim 1 further containing manganese, as a part of the subsidiary component, the content of manganese being not more than 0.5 part by weight (except 0 part by weight) in terms of MnO 2 with respect to 100 parts by weight of the main component.
Claim 4
Dependent Claim
68 words
The dielectric ceramic composition according to claim 1 further containing, as a part of the subsidiary component, a compound represented by the general formula: A(Cu.sub.1/2 W.sub.1/2)O.sub.3 (wherein A is one or more elements selected from the group consisting of Pb, Ba, Sr, and Ca), the content of said compound being from 0.5 to 5.0 parts by weight with respect to 100 parts by weight of the main component.
Claim 5
Dependent Claim
102 words
The dielectric ceramic composition according to claim 1 further contains, as a part of the subsidiary component, manganese and a compound represented by the general formula: A(Cu 1/2 W 1/2 )O 3 (wherein A is one or more elements selected from the group consisting of Pb, Ba, Sr, and Ca), the content of manganese being not more than 0.5 part by weight in terms of MnO 2 with respect to 100 parts by weight of the main component and, the content of said compound being 0.5 to 5.0 parts by weight with respect to 100 parts be weight of the main component.
Claim 6
Dependent Claim
41 words
The dielectric ceramic composition according to claim 1 in which the amount of Pb 3 O 4 in the main component is 68.06 to 69.36 weight % and the amount of Nb 2 O 5 is 24.02 to 26.66 weight %.
Claim 7
Dependent Claim
20 words
The dielectric ceramic composition according to claim 2 in which the content of manganese is 0.1 to 0.5 weight %.
Claim 8
Dependent Claim
25 words
The dielectric ceramic composition according to claim 3 wherein A is Pb and the amount of lead containing compound is 1 to 4 weight %.
Claim 9
Dependent Claim
30 words
The dielectric ceramic composition according to claim 1 wherein said set of compositional proportions of the three components falls within an area defined by the triangle BCD in FIG. 1.
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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) | 1991-06-28 | 1991-12-28 | 1992-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-28 | 1995-12-28 | 1996-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-28 | 1999-12-28 | 2000-06-28 | $7700.00 | Window Closed / Lapsed |