US4751209A
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Dielectric ceramic compositions
Assignee: Panasonic Holdings Corp
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Filing: 1986-10-10
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Granted: 1988-06-14
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Expires: 2006-10-10
Abstract
Abstract Dielectric ceramic composition consisting essentially of substance selected from those represented by the following formulas: (1) Pb a (Mg 1/3 Nb 2/3 ) x Ti y (Ni 1/2 W 1/2 ) z O 2+a (2) Pb a Ca b (Mg 1/3 Nb 2/3 ) x Ti y (Ni 1/2 W 1/2 ) z O 2+a+b (3) Pb a Ba b (Mg 1/3 Nb 2/3 ) x Ti y (Ni 1/2 W 1/2 ) z O 2+a+b (4) Pb a Sr b (Mg 1/3 Nb 2/3 ) x Ti y (Ni 1/2 W 1/2 ) z O 2+a+b wherein x+y+z=1.00, and a or a+b≧1.001. These compositions can be sintered below 1080° C. in low partial pressure of oxygen of about 1×10 -8 , and exhibit a high dielectric constant and a high electrical resistivity.
Inventors
- 👤 Yoichirou Yokotani
- 👤 Junichi Kato
- 👤 Hiromu Ouchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:35
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1254; H01G4/1263; C; C04; C04B; C04B35/00; C04B35/01; C04B35/495; C04B35/497; C04B35/499
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
56 words
A ceramic composition consisting essentially of a material represented by the formula Pb.sub.a (Mg.sub.1/3 Nb.sub.2/3).sub.x Ti.sub.y (Ni.sub.1/2 W.sub.1/2).sub.z O.sub.2+a wherein subscripts a, x, y and z represent molar fractions of the respective components, x+y+z=1 and 1.001≦a≦1.110, said composition falling within a polygonal area defined by the points A, B, C, D and E in FIG. 1.
Claim 2
Dependent Claim
56 words
A ceramic composition consisting essentially of a material represented by the formula Pb.sub.a (Mg.sub.1/3 Nb.sub.2/3).sub.x Ti.sub.y (Ni.sub.1/2 W.sub.1/2).sub.z O.sub.2+a wherein subscripts a, x, y and z represent molar fractions of the respective components, x+y+z=1 and 1.001≦a≦1.110, said composition falling within a polygonal area defined by the points A, B, C, D and E in FIG. 1.
Claim 3
Dependent Claim
59 words
A ceramic composition consisting essentially of a material represented by the formula Pb.sub.a Ca.sub.b (Mg.sub.1/3 Nb.sub.2/3).sub.x Ti.sub.y (Ni.sub.1/2 W.sub.1/2).sub.z O.sub.2+a+b wherein subscripts a, b, x, y and z represent molar fractions of the respective components, x+y+z=1, 1.001≦a+b≦1.225, and 0.001≦b≦0.225, said composition falling within a polygonal area defined by the points F, G, H, I and J in FIG. 2.
Claim 4
Dependent Claim
59 words
A ceramic composition consisting essentially of a material represented by the formula Pb.sub.a Ca.sub.b (Mg.sub.1/3 Nb.sub.2/3).sub.x Ti.sub.y (Ni.sub.1/2 W.sub.1/2).sub.z O.sub.2+a+b wherein subscripts a, b, x, y and z represent molar fractions of the respective components, x+y+z=1, 1.001≦a+b≦1.225, and 0.001≦b≦0.225, said composition falling within a polygonal area defined by the points F, G, H, I and J in FIG. 2.
Claim 5
Dependent Claim
59 words
A ceramic composition consisting essentially of a material represented by the formula Pb.sub.a Ba.sub.b (Mg.sub.1/3 Nb.sub.2/3).sub.x Ti.sub.y (Ni.sub.1/2 W.sub.1/2).sub.z O.sub.2+a+b wherein subscripts a, b, x, y and z represent molar fractions of the respective components, x+y+z=1, 1.001≦a+b≦1.200, and 0.001≦b≦0.200, said composition falling within a polygonal area defined by the points K, L, M, N and O in FIG. 3.
Claim 6
Dependent Claim
59 words
A ceramic composition consisting essentially of a material represented by the formula Pb.sub.a Ba.sub.b (Mg.sub.1/3 Nb.sub.2/3).sub.x Ti.sub.y (Ni.sub.1/2 W.sub.1/2).sub.z O.sub.2+a+b wherein subscripts a, b, x, y and z represent molar fractions of the respective components, x+y+z=1, 1.001≦a+b≦1.200, and 0.001≦b≦0.200, said composition falling within a polygonal area defined by the points K, L, M, N and O in FIG. 3.
Claim 7
Dependent Claim
58 words
A ceramic composition consisting essentially of a material replesented by the formula Pb.sub.a Sr.sub.b (Mg.sub.1/3 Nb.sub.2/3).sub.x Ti.sub.y (Ni.sub.1/2 W.sub.1/2).sub.z O.sub.2+a+b wherein subscripts a, b, x, y and z represent molar fractions of the respective components, x+y+z=1, 1.001≦a+b≦1.240, and 0.001≦b≦0.225, said composition falling within a polygonal area defined by the points P, Q, R and S in FIG. 4.
Claim 8
Dependent Claim
58 words
A ceramic composition consisting essentially of a material replesented by the formula Pb.sub.a Sr.sub.b (Mg.sub.1/3 Nb.sub.2/3).sub.x Ti.sub.y (Ni.sub.1/2 W.sub.1/2).sub.z O.sub.2+a+b wherein subscripts a, b, x, y and z represent molar fractions of the respective components, x+y+z=1, 1.001≦a+b≦1.240, and 0.001≦b≦0.225, said composition falling within a polygonal area defined by the points P, Q, R and S in FIG. 4.
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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) | 1991-06-14 | 1991-12-14 | 1992-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-14 | 1995-12-14 | 1996-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-14 | 1999-12-14 | 2000-06-14 | $7700.00 | Window Closed / Lapsed |