US4929595A
Expired / Lapsed
US
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Superconducting thin film fabrication
Assignee: University of Alabama in Huntsville
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Filing: 1988-02-26
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Granted: 1990-05-29
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Expires: 2008-02-26
Abstract
Abstract An improved fabrication of superconducting films is disclosed whereby a multi-phase Y-Ba-Cu-O compound is utilized. The film is formed by sputtering of a target material consisting of the superconducting 123 phase Y 1 Ba 2 Cu 3 O 7 onto the green 211 phase Y 2 BaCuO 5 . After annealing, the superconducting characteristics, of the formed film, in terms of transition width and T c , are improved over those using other oxide compounds as substrates.
Inventors
- 👤 Maw-Kuen Wu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:10
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/06; C23C14/08; C23C14/087; H; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; H10N60/0296; H10N60/0408; H10N60/0576; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/93; Y10S505/00; Y10S505/80; Y10S505/812; Y10S505/813; Y10S505/815; Y10S505/816
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
90 words
A superconducting cuprate oxide thin film on a substrate prepared by the steps of: forming a target material by mixing together appropriate amounts of metal oxide in order to form a superconducting phase of a cuprate oxide; annealing said target material in oxygen; forming a substrate material by mixing together appropriate amounts of metal oxides to form at least one semiconducting phase of said superconducting cuprate oxide superconductor; sputtering said target material to form a film on said substrate material; and annealing said film and substrate in an oxygen environment.
Claim 2
Dependent Claim
90 words
A superconducting cuprate oxide thin film on a substrate prepared by the steps of: forming a target material by mixing together appropriate amounts of metal oxide in order to form a superconducting phase of a cuprate oxide; annealing said target material in oxygen; forming a substrate material by mixing together appropriate amounts of metal oxides to form at least one semiconducting phase of said superconducting cuprate oxide superconductor; sputtering said target material to form a film on said substrate material; and annealing said film and substrate in an oxygen environment.
Claim 3
Dependent Claim
40 words
The film according to claim 1, wherein said cuprate oxide superconductor is Y-Ba-Cu-O and wherein said semiconductor phase is the green Y 2 BaCuO 5 phase and said superconducting phase is Y 1 Ba 2 Cu 3 O 7 .
Claim 4
Dependent Claim
25 words
The film according to claim 2, wherein said semiconductor phase was prepared by heating and regrinding appropriate amounts of the oxides to insure complete reaction.
References Cited (Backward Citations)
No citation records indexed.
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 |