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US4086124A
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Method of polarization of a ferroelectric material
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
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Filing: 1975-05-19
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Granted: 1978-04-25
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Expires: 1995-05-19
Abstract
Abstract In a method of polarization of a ferroelectric material having a Curie point at a temperature T c , the material is brought to a temperature above T c , subjected to a temperature gradient and then returned to a temperature below the Curie point. No electric field is applied, because the temperature gradient itself has been found to produce ferroelectric polarization under the described circumstances.
Inventors
- 👤 Jean Claude Peuzin
- 👤 Michel Tasson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:37
CPC Classifications
H; H01; H01G; H01G7/00; H01G7/02; H01G7/025; Y; Y10; Y10S; Y10S117/00; Y10S117/918; Y10T; Y10T29/00; Y10T29/42
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
116 words
A method of polarizing a ferroelectric material which exhibits a Curie point at a temperature T c , without applying an electric field thereto, comprising: bringing a solid body of said material to a temperature above the Curie point T c but below the temperature of fusion; establishing and maintaining a temperature gradient in said material along a linear dimension of said body without bringing any part of said material to the temperature of fusion; suppressing said temperature gradient by equalizing the temperature of the heated material as preparation for and prior to transition back through the Curie point T c and; bringing said material back to a temperature below the Curie point T c .
Claim 2
Independent Claim
116 words
A method of polarizing a ferroelectric material which exhibits a Curie point at a temperature T c , without applying an electric field thereto, comprising: bringing a solid body of said material to a temperature above the Curie point T c but below the temperature of fusion; establishing and maintaining a temperature gradient in said material along a linear dimension of said body without bringing any part of said material to the temperature of fusion; suppressing said temperature gradient by equalizing the temperature of the heated material as preparation for and prior to transition back through the Curie point T c and; bringing said material back to a temperature below the Curie point T c .
Claim 3
Dependent Claim
14 words
A method according to claim 1, wherein said material is a lithium niobate crystal.
References Cited (Backward Citations)
FR1397526A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-24 | 1981-10-24 | 1982-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-24 | 1985-10-24 | 1986-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-24 | 1989-10-24 | 1990-04-25 | $7700.00 | Window Closed / Lapsed |