EP0277020A2
Expired / Lapsed
EP
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Method of preparing a superconductive material
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1988-01-28
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Granted: —
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Expires: 2008-01-28
Abstract
Abstract A superconductive material including a substrate and a superconductive layer of a double oxide of metals provided on the substrate is produced by a method which comprises the steps of: (a) providing a solution containing a blend of metal compounds having a composition corresponding to that of the double oxide; (b) applying the solution on the substrate to form a liquid film; (c) drying the liquid film; and (d) calcining the dried film to convert the metal compounds into the superconductive double oxide of the metals.
Inventors
- 👤 Susumu Mizuta
- 👤 Toshiya Kumagai
- 👤 Wakichi Kondo
- 👤 Kenji Kawaguchi
- 👤 Shigemitsu Shin
- 👤 Hiroshi Yokota
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 08:59
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; H10N60/0296; H10N60/0324; C; C01; C01G; C01G3/00; C01G3/006; H10N60/0576; Y; Y10; Y10S; Y10S505/00; Y10S505/70; Y10S505/725; Y10S505/734; Y10S505/739; Y10S505/741
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
83 words
A method of preparing a superconductive material having a superconductive layer of a double oxide of metals provided on a substrate, said method comprising the steps of: (a) providing a solution containing a blend of metal compounds having a composition corresponding to that of the double oxide; (b) applying said solution on the substrate to form a liquid film; (c) drying said liquid film; and (d) calcining said dried film to convert said metal compounds into the superconductive double oxide of said metals.
Claim 2
Independent Claim
83 words
A method of preparing a superconductive material having a superconductive layer of a double oxide of metals provided on a substrate, said method comprising the steps of: (a) providing a solution containing a blend of metal compounds having a composition corresponding to that of the double oxide; (b) applying said solution on the substrate to form a liquid film; (c) drying said liquid film; and (d) calcining said dried film to convert said metal compounds into the superconductive double oxide of said metals.
Claim 3
Dependent Claim
20 words
A method as claimed in claim 1, wherein said substrate is in the form of a wire or a plate.
Claim 4
Dependent Claim
24 words
A method as claimed in claim 1, wherein said metal compounds are compounds capable of forming oxides upon calcination at 1000 °C or less.
Claim 5
Dependent Claim
23 words
A method as claimed in claim 3, wherein said metal compounds are alkoxides, salts, chelates, halides, hydroxides, peroxides or oxides of said metals.
Claim 6
Dependent Claim
41 words
A method as claimed in claim 3, wherein said metal compounds are naphthenates, octylates, caprylates, stearates, laurates, butyrates, propionates, oxalates, citrates, lactates, phenoxides, cathechoxides, benzoates, salcilates, ethylenediaminetetracetates, nitrates, carbonates, hydrochlorides, ethoxides, propoxides, isopropoxides, butoxides, ethyelene glycoxides, glycerides, acetylacetonates of said metals.
Claim 7
Dependent Claim
28 words
A method as claimed in claim 1, wherein step (d) is performed at a temperature of 500-1000 °C for a period of time of 0.5 hour or more.
Claim 8
Dependent Claim
24 words
A method as claimed in claim 1, wherein steps (a) through (d) are repeated until said superconductive layer has a thickness of 0.01-20 um.
Claim 9
Dependent Claim
22 words
A method as claimed in claim 1, wherein step (d) is performed at a temperature of 500-1000 °C in an oxygen-containing atmosphere.
Claim 10
Dependent Claim
22 words
A method as claimed in claim 8, wherein the calcination in the oxygen-containing atmosphere is preceded by calcination in an oxygen-free atmosphere.
Claim 11
Dependent Claim
127 words
A method as claimed in claim 1, wherein said solution contains a first compound selected from the group consisting of Y compounds, La compounds, Nd compounds, Sm compounds, Eu compounds, Gd compounds, Dy compounds, Ho compounds, Er compounds, Yb compounds, Lu compounds and mixtures thereof, a second compound selected from the group consisting of Ba compounds, Sr compounds, Ca compounds and mixtures thereof and a Cu compound so that said double oxide has a formula: AB₂Cu₃O 7+x wherein A stands for Y, La, Nd, Sm, Eu, Gd, Dy, Ho, Er, Yb, Lu, or a mixture of two or more thereof, B stands for Ba, Sr, Ca or a mixture of two or more thereof, and x stands for a number greater than -1 but less than +1.
Claim 12
Dependent Claim
87 words
A method as claimed in claim 1, wherein said solution contains a La compound, a compound selected from the group consisting of Ba compounds, Sr compounds, Ca compounds and mixtures thereof and a Cu compound so that said double oxide has a formula: (La 1-y Z y )₂CuO 4-z wherein Z stands for Ba, Sr, Ca or a mixture of two or more thereof, y is greater than 0 but not greater than 0.2 and z is a number less than 1 but not less than 0.
Claim 13
Dependent Claim
20 words
A method as claimed in claim 1, wherein said substrate is formed of a metal, metal oxide or a ceramic.
Claim 14
Dependent Claim
11 words
A superconductive material obtained by the method according to claim 1.
References Cited (Backward Citations)
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