US4929598A
Expired / Lapsed
US
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Oxygen plasma treatment of yttrium barium copper oxide
Assignee: Iconectiv LLC
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Filing: 1988-12-30
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Granted: 1990-05-29
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Expires: 2008-12-30
Abstract
Abstract A method is described for the preparation of superconducting compositions in the yttrium-barium-copper oxide system. The oxygen stoichiometry required to assure the superconducting state is attained by a either a thermal annealing process or by means of plasma oxidation.
Inventors
- 👤 Brian G. Bagley
- 👤 Jean-Marie Tarascon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:53
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/45; C04B35/4504; C04B35/4508; H; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; H10N60/0661
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
59 words
Method for the preparation of a superconducting thin film composition of the formula YBa 2 Cu 3 O.sub.(7-x) wherein x has a value less than 0.75 which comprises subjecting a thin film of non-superconducting YBa 2 Cu 3 O.sub.(7-x) wherein x has a value greater than 0.75 to an oxygen plasma near room temperature for at least one hour.
Claim 2
Dependent Claim
59 words
Method for the preparation of a superconducting thin film composition of the formula YBa 2 Cu 3 O.sub.(7-x) wherein x has a value less than 0.75 which comprises subjecting a thin film of non-superconducting YBa 2 Cu 3 O.sub.(7-x) wherein x has a value greater than 0.75 to an oxygen plasma near room temperature for at least one hour.
Claim 3
Dependent Claim
46 words
Method in accordance with claim 1 wherein plasma oxidation is effected in a cylindrical reactor at a power density of less than 0.005 Watts/cm 3 by RF heating at an oxygen pressure of the order of 0.7 Torr. and a frequency of 13.56 MH z .
Claim 4
Independent Claim
55 words
The method treating a non-superconducting composition of a material YBa 2 CU 3 O.sub.(7-x) wherein x has a value greater than 0.75 to obtain a superconducting composition wherein x is less than 0.75 comprising subjecting the composition to an oxygen plasma near room temperature for at least one hour to assure the proper oxygen stoichiometry.
Claim 5
Independent Claim
55 words
The method treating a non-superconducting composition of a material YBa 2 CU 3 O.sub.(7-x) wherein x has a value greater than 0.75 to obtain a superconducting composition wherein x is less than 0.75 comprising subjecting the composition to an oxygen plasma near room temperature for at least one hour to assure the proper oxygen stoichiometry.
References Cited (Backward Citations)
US4362765A
Cited
JPS61168530A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-05-28 | 1993-11-27 | 1994-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-28 | 1997-11-27 | 1998-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-28 | 2001-11-27 | 2002-05-29 | $7700.00 | Window Closed / Lapsed |