Spray pyrolysis process for preparing superconductive films
First Claim
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1. A spray pyrolysis method for preparing thin superconductive film, comprising the steps of:
- (a) preparing a spray pyrolysis solution comprising Bi,Sr,Ca and Cu metals in a solvent;
(b) heating a substrate to a first temperature;
(c) spraying said solution onto said heated substrate to form a film thereon;
(d) heating said film and substrate to a second temperature of about 700°
-825°
C., said second temperature being higher than said first temperature;
(e) heating said film and substrate to a third temperature of about 870°
-890°
C. to melt said film;
(f) once said film and substrate reach said third temperature, further heat treating said film and substrate at a fourth temperature of about 840°
-860°
C.; and
(g) cooling said film and substrate to ambient temperature.
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Abstract
An improved method for preparing high temperature Bi-Sr-Ca-Cu-O superconductive films utilizing spray pyrolysis. The method can further include an additional annealing step to improve the electrical transport properties.
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Citations
23 Claims
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1. A spray pyrolysis method for preparing thin superconductive film, comprising the steps of:
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(a) preparing a spray pyrolysis solution comprising Bi,Sr,Ca and Cu metals in a solvent; (b) heating a substrate to a first temperature; (c) spraying said solution onto said heated substrate to form a film thereon; (d) heating said film and substrate to a second temperature of about 700°
-825°
C., said second temperature being higher than said first temperature;(e) heating said film and substrate to a third temperature of about 870°
-890°
C. to melt said film;(f) once said film and substrate reach said third temperature, further heat treating said film and substrate at a fourth temperature of about 840°
-860°
C.; and(g) cooling said film and substrate to ambient temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 19, 20)
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13. A spray pyrolysis method for preparing thin superconductive films, comprising the steps of:
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(a) preparing a spray pyrolysis solution comprising Bi, Sr, Ca and Cu metals and a fluxing agent in a solvent; (b) heating a substrate to a first temperature; (c) spraying said solution onto said heated substrate to form a film thereon; (d) heating said film and substrate to a second temperature of about 700°
-825°
C., said second temperature being higher than said first temperature;(e) heating said film and substrate at a third temperature of about 840°
-860°
C.; and(f) cooling said film and substrate to ambient temperature. - View Dependent Claims (14, 15, 16, 17, 18, 21, 22)
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23. A spray pyrolysis method for preparing thin superconductive films, comprising the steps of:
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spraying a spray pyrolysis solution comprising Bi, Sr, Ca and Cu metals in a solvent onto a heated substrate to form a film thereon; and heating said film and substrate to melt said film.
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Specification