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US5071830A
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Metalorganic deposition method for forming epitaxial thallium-based copper oxide superconducting films
Assignee: Clearday Inc
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Filing: 1988-08-31
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Granted: 1991-12-10
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Expires: 2008-08-31
Abstract
Abstract An epitaxial thallium-based copper oxide superconducting film is formed on a crystalline substrate by metalorganic deposition which comprises forming a film of carboxylate soap solution on said substrate, prepyrolyzing said film at a temperature of 350° C. or less and pyrolyzing said film at a temperature of 800°900° C. in the presence of oxygen and an overpressure of thallium for a sufficient time to produce said epitaxial superconducting film.
Inventors
- 👤 William L. Olson
- 👤 Michael M. Eddy
- 👤 Robert B. Hammond
- 👤 Timothy W. James
- 👤 McDonald Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:07
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; H10N60/0296; H10N60/0521; C; C23; C23C; C23C14/00; C23C14/06; C23C14/08; C23C14/087; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/203; H10N60/0548; H10N60/20; H10N60/203; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/93; Y10S505/00; Y10S505/70; Y10S505/701; Y10S505/702; Y10S505/725; Y10S505/734; Y10S505/735
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
148 words
A method for producing a superconducting article comprising an oriented metal oxide superconducting layer containing thallium, optionally calcium, barium and copper, said layer being at least 30 Å and having a c-axis oriented normal to a crystalline substrate surface, said method comprising, (1) coating the crystalline substrate surface with a solution of thallium, optionally calcium, barium and copper carboxylate soaps dispersed in a medium of hydrocarbons of halohydrocarbons with a stoichiometric metal ratio to form said oxide superconducting layer, (2) prepyrolyzing said soaps coated on said substrate at a temperature of 350° C. or less in an oxygen containing atmosphere, and (3) pyrolyzing said soaps at a temperature in the range of 800°-900° C. in the presence of oxygen and an overpressure of thallium for a sufficient time to produce said superconducting layer on said substrate, wherein usable portions of said superconducting layer are epitaxial to said substrate.
Claim 2
Independent Claim
148 words
A method for producing a superconducting article comprising an oriented metal oxide superconducting layer containing thallium, optionally calcium, barium and copper, said layer being at least 30 Å and having a c-axis oriented normal to a crystalline substrate surface, said method comprising, (1) coating the crystalline substrate surface with a solution of thallium, optionally calcium, barium and copper carboxylate soaps dispersed in a medium of hydrocarbons of halohydrocarbons with a stoichiometric metal ratio to form said oxide superconducting layer, (2) prepyrolyzing said soaps coated on said substrate at a temperature of 350° C. or less in an oxygen containing atmosphere, and (3) pyrolyzing said soaps at a temperature in the range of 800°-900° C. in the presence of oxygen and an overpressure of thallium for a sufficient time to produce said superconducting layer on said substrate, wherein usable portions of said superconducting layer are epitaxial to said substrate.
Claim 3
Dependent Claim
35 words
The method of claim 1 further comprising, after said coating and prepyrolyzing steps, the steps of: recoating the substrate with a solution of thallium, optionally calcium, barium and copper carboxylate soaps, and re-prepyrolyzing the soaps,
Claim 4
Dependent Claim
19 words
The method of claim 2 wherein the soaps are reprepyrolyzed at a lower temperature than they were originally prepyrolyzed.
Claim 5
Dependent Claim
19 words
The method of claim 1, wherein the prepyrolyzing step is at a temperature in the range of 250°-350° C.
Claim 6
Dependent Claim
11 words
The method according to claim 1, wherein said soaps are 2-ethylhexanoates.
Claim 7
Dependent Claim
11 words
The method according to claim 1, wherein said soaps are neodecanoates.
Claim 8
Dependent Claim
16 words
The method according to claim 1, wherein said substrate is magnesium oxide or yttria stabilized zirconia.
Claim 9
Dependent Claim
14 words
The method of claim 1 wherein the epitaxial superconducting layer has the 2223 composition.
Claim 10
Dependent Claim
14 words
The method of claim 1 wherein the epitaxial superconducting layer has the 2122 composition.
Claim 11
Dependent Claim
42 words
The method of claim 1 further comprising, before said coating and prepyrolyzing steps, the steps of: coating the substrate with a solution of thallium, optionally calcium, barium and copper carboxylate soaps, and prepyrolyzing the soaps at a temperature less than 500° C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-09 | 1995-06-10 | 1995-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-09 | 1999-06-10 | 1999-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-09 | 2003-06-10 | 2003-12-10 | $7700.00 | Window Closed / Lapsed |