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US5635433A
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Ceramic ferroelectric composite material-BSTO-ZnO
Assignee: United States Department of the Army
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Filing: 1995-09-11
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Granted: 1997-06-03
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Expires: 2015-09-11
Abstract
Abstract A novel ceramic ferroelectric material having a high dielectric constant, a low loss tangent, a low threshold voltage, a high nonlinear voltage exponent and a high tunability. The material is a composite comprising Barium Strontium Titanate (BSTO) and zinc oxide (ZnO). The preferred composite is represented by Ba1-xSrxTiO3-ZnO, wherein x is greater than 0.00, but less than or equal to 0.75, and wherein the percent weight ratio between BSTO and ZnO ranges from approximately 99%-50% and 1%-50% respectively. The novel materials possess superior electronic properties, and they may be employed in multilayer capacitors, capacitor-varistors, non-volatile computer memory or phased array antenna systems.
Inventors
- 👤 Louise Sengupta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:34
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/453; C04B35/46; C04B35/462; C04B35/465
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
73 words
A ceramic Ferroelectric composite material BSTO-ZnO material consisting of; Barium Strontium Titanate, said barium Strontium Titanate represented as Ba 1-x Sr x TiO 3 , wherein said x is greater than 0.0 but less than or equal to 0.75; and zinc oxide represented as ZnO; wherein the weight ratio of said Barium Strontium Titanate to zinc oxide ranges from approximately 99-50% wt. said Barium Strontium Titanate to approximmately 1%-50% wt. said zinc oxide.
Claim 2
Dependent Claim
73 words
A ceramic Ferroelectric composite material BSTO-ZnO material consisting of; Barium Strontium Titanate, said barium Strontium Titanate represented as Ba 1-x Sr x TiO 3 , wherein said x is greater than 0.0 but less than or equal to 0.75; and zinc oxide represented as ZnO; wherein the weight ratio of said Barium Strontium Titanate to zinc oxide ranges from approximately 99-50% wt. said Barium Strontium Titanate to approximmately 1%-50% wt. said zinc oxide.
Claim 3
Dependent Claim
24 words
The ceramic ferroelectric composite material-BSTO-ZnO according to claim 1, wherein said Barium Strontium Titanate is Ba 1-x Sr x TiO 3 , wherein x=0.40.
Claim 4
Dependent Claim
36 words
The ceramic ferroelectric composite material-BSTO-ZnO according to claim 1, wherein the ratio of said Barium Strontium Titanate to said zinc oxide is approximately 70% wt. said Barium Strontium Titanate to approximately 30% wt. said zinc oxide.
Claim 5
Dependent Claim
45 words
The ceramic ferroelectric composite material-BSTO-ZnO according to claim 1, wherein the weight ratio of said Barium Strontium Titanate to said zinc oxide ranges from approximately 99%-85% wt. said Barium Strontium Titanate to approximately 1%-15% wt. said zinc oxide for use in phased array antenna systems.
Claim 6
Dependent Claim
110 words
The ceramic ferroelectric composite material BSTO-ZnO according to claim 1, wherein the weight ratio of said Barium Strontium Titanate to said zinc oxide ranges from approximately 85%-50% wt. said Barium Strontium Titanate to approximately 15%-50% Wt. said zinc oxide for use in a capacitor-varistor protection device for microelectric circuits; wherein said Barium Strontium Titanate and said zinc oxide are present in an amount to provide a composite having a a high dielectric constant of from approximately 3500 to 110,000; and a low loss tangent of 0.5 or less; a low threshold voltage of between 5-100 volts; a high nonlinear voltage exponent, and and high tunability ranging from 4 to 50%.
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| 3.5 Years (Year 4) | 2000-06-02 | 2000-12-02 | 2001-06-03 | $2000.00 | Window Closed / Lapsed |
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