US5337209A
Expired / Lapsed
US
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High energy density lead magnesium niobate-based dielectric ceramic and process for the preparation thereof
Assignee: Lockheed Martin Corp
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Filing: 1992-09-10
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Granted: 1994-08-09
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Expires: 2012-09-10
Abstract
Abstract A dielectric ceramic composition is disclosed comprising lead magnesium niobate and strontium titanate, barium titanate or a combination thereof. Dopants such as Ta, La, Y, Eu, Nd, Sm, Gd, W, Si, Zr and Sb may also be included in the composition. The lead magnesium niobate with strontium titanate and/or barium titanate composition has been found to possess extremely favorable properties such as high dielectric constant, low dielectric loss, high breakdown strength, low field-induced strain, high electrical resistivity and exceptionally high energy storage capacity. A process is also disclosed for the production of dielectric ceramic materials which includes the use of hot isostatic pressing in an oxygen-containing atmosphere. The disclosed dielectric compositions are useful in capacitors for many applications, including medical devices such as defibrillators and pacemakers.
Inventors
- 👤 Audrey E. Sutherland
- 👤 Keith Bridger
- 👤 Eric M. Fiore
- 👤 Julie A. Christodoulou
- 👤 Alex E. Bailey
- 👤 Allan S. Gelb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:13
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1218; H01G4/1227; C; C04; C04B; C04B35/00; C04B35/01; C04B35/495; C04B35/497; C04B35/499; C04B35/622; C04B35/64; C04B35/645; C04B35/6455; A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/372; A61N1/378; A61N1/38; A61N1/39; A61N1/3956
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
53 words
A dielectric composition comprising a solid solution of from about 50 to about 85 mole percent Pb(Mg x Nb y )O 3 wherein x is 1/3, y is 2/3 or x is 1/2, y is 1/2, and from about 15 to about 50 mole percent SrTiO 3 , BaTiO 3 or combination thereof.
Claim 2
Dependent Claim
53 words
A dielectric composition comprising a solid solution of from about 50 to about 85 mole percent Pb(Mg x Nb y )O 3 wherein x is 1/3, y is 2/3 or x is 1/2, y is 1/2, and from about 15 to about 50 mole percent SrTiO 3 , BaTiO 3 or combination thereof.
Claim 3
Dependent Claim
29 words
A dielectric composition according to claim 1, wherein the SrTiO 3 , BaTiO 3 or combination thereof comprises from about 20 to about 40 mole percent of the composition.
Claim 4
Dependent Claim
25 words
A dielectric composition according to claim 1, wherein the SrTiO 3 , BaTiO 3 or combination thereof comprises about 30 mole percent of the composition.
Claim 5
Dependent Claim
20 words
A dielectric composition according to claim 1, wherein the composition further comprises up to about 50 mole percent Ta dopant.
Claim 6
Dependent Claim
23 words
A dielectric composition according to claim 4, wherein the Ta dopant comprises from about 10 to about 40 mole percent of the composition.
Claim 7
Dependent Claim
36 words
A dielectric composition according to claim 1, wherein the composition further comprises up to about 5 mole percent of at least one dopant selected from La, Y, Eu, Nd, Sm, Gd, W, Si, Zr and Sb.
Claim 8
Dependent Claim
17 words
A dielectric composition according to claim 6, wherein the dopant is selected from La, Y and Eu.
Claim 9
Dependent Claim
22 words
A dielectric composition according to claim 6, wherein the dopant comprises from about 0.1 to about 3 mole percent of the composition.
Claim 10
Dependent Claim
24 words
A dielectric composition according to claim 1, wherein the Pb(Mg x Nb y )O 3 is stoichiometric Pb(Mg 1/3 Nb 2/3 )O 3 .
Claim 11
Dependent Claim
24 words
A dielectric composition according to claim 1, wherein the Pb(Mg x Nb y )O 3 is non-stoichiometric Pb(Mg 1/2 Nb 1/2 )O 3 .
Claim 12
Dependent Claim
15 words
A dielectric composition according to claim 1, wherein the composition is primarily a perovskite phase.
Claim 13
Dependent Claim
53 words
A capacitor comprising electrodes in contact with at least one layer of dielectric material, the dielectric material comprising from about 50 to about 85 mole percent stoichometric or non-stoichiometric Pb(Mg x Nb y )O 3 3 and from about 15 to about 50 mole percent SrTiO 3 , BaTiO 3 or combination thereof.
Claim 14
Dependent Claim
53 words
A capacitor comprising electrodes in contact with at least one layer of dielectric material, the dielectric material comprising from about 50 to about 85 mole percent stoichometric or non-stoichiometric Pb(Mg x Nb y )O 3 3 and from about 15 to about 50 mole percent SrTiO 3 , BaTiO 3 or combination thereof.
Claim 15
Dependent Claim
20 words
A capacitor according to claim 12, wherein the capacitor comprises multiple layers of the dielectric material separated by electrode layers.
Claim 16
Dependent Claim
21 words
A capacitor according to claim 12, wherein the capacitor possesses an energy storage capacity of greater than 3 J/cm 3 .
Claim 17
Dependent Claim
21 words
A capacitor according to claim 12, wherein the capacitor possesses an energy storage capacity of greater than 5 J/cm 3 .
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