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US5028585A
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Superconducting oxide FCC oxide composite compositions and method of making such compositions
Assignee: WR Grace and Co Conn
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Filing: 1988-05-13
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Granted: 1991-07-02
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Expires: 2008-05-13
Abstract
Abstract Two or more superconductors are reacted together to form a non-superconducting phase encapsulating a residual superconducting phase. For example YBa 2 Cu 3 oxide is reacted with Bi 2 Sr 2 CaCu 2 oxide to form a superconducting product containing a novel non-superconducting oxide of Y, Bi, and Ba. A superconducting YBa 2 Cu 3 oxide remains as an interconnected phase throughout the product. The new non-superconducting phase largely encapsulates and insulates the superconducting phase.
Inventors
- 👤 Nicholas D. Spencer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:16
CPC Classifications
C; C04; C04B; C04B35/00; C01; C01G; C01G3/00; C01G3/006; C01G29/00; C01G29/006; C01G5/00; C01G5/006; C01G7/00; C01G7/006; C04B35/01; C04B35/45; C04B35/4504; C04B35/4521; H; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; H10N60/0661; H10N60/0716; H10N60/80; H10N60/85; H10N60/855; H10N60/857; C01P; C01P2002/00; C01P2002/50; C01P2002/70; C01P2002/72; C01P2002/74; C01P2002/77; C01P2004/00; C01P2004/01; C01P2004/03; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/32; C01P2006/40; Y; Y10; Y10S; Y10S505/00; Y10S505/725; Y10S505/737; Y10S505/738; Y10S505/775; Y10S505/785
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
25 words
Oxide of Y, Bi, and Ba, in a face-centered cubic phase with a=8.55 Angstroms and having a semi-conductor to metal transition at about 120° K.
Claim 2
Dependent Claim
25 words
Oxide of Y, Bi, and Ba, in a face-centered cubic phase with a=8.55 Angstroms and having a semi-conductor to metal transition at about 120° K.
Claim 3
Dependent Claim
31 words
Composition consisting of about 60 weight % of the oxide of claim 1 and about 40 weight % of a superconducting oxide of YBa 2 Cu 3 and an interconnected phase.
Claim 4
Dependent Claim
79 words
Process comprising reacting together at least two superconducting to form a superconducting product containing a non-superconducting component, wherein at least one of the superconductor reactants is an oxide containing L-M-A where: L is at least one trivalent metal, including bismuth and the rare earth group including scandium and yttrium; M is at least one bivalent Metal, including barium, beryllium, magnesium, calcium, and strontium; and A is at least one metal of multiple valency including niobium, copper, silver and gold.
Claim 5
Dependent Claim
79 words
Process comprising reacting together at least two superconducting to form a superconducting product containing a non-superconducting component, wherein at least one of the superconductor reactants is an oxide containing L-M-A where: L is at least one trivalent metal, including bismuth and the rare earth group including scandium and yttrium; M is at least one bivalent Metal, including barium, beryllium, magnesium, calcium, and strontium; and A is at least one metal of multiple valency including niobium, copper, silver and gold.
Claim 6
Dependent Claim
122 words
Process of preparing superconducting oxide of Bi, Sr, Ca, Y, Ba, and Cu comprising: (A) reacting aqueous solution of nitrates of Bi, Sr, Ca, Y, Ba, and Cu with a stoichiometric equivalent of a solution of quaternary ammonium, carbonate so as to form coprecipitates of the carbonates of Bi, Sr, Ca, Y, Ba, and Cu and to provide excess YBa 2 Cu 3 ; (B) recovering and drying the carbonates; and (C) calcining the dried carbonates to form a composition containing an oxide of Y, Bi, and Ba in a face-centered cubic phase with a=8.55 Angstroms and having a semi-conductor to metal transition at about 120° K. and also containing a superconducting oxide of YBa 2 Cu 3 as an interconnected phase.
Claim 7
Dependent Claim
122 words
Process of preparing superconducting oxide of Bi, Sr, Ca, Y, Ba, and Cu comprising: (A) reacting aqueous solution of nitrates of Bi, Sr, Ca, Y, Ba, and Cu with a stoichiometric equivalent of a solution of quaternary ammonium, carbonate so as to form coprecipitates of the carbonates of Bi, Sr, Ca, Y, Ba, and Cu and to provide excess YBa 2 Cu 3 ; (B) recovering and drying the carbonates; and (C) calcining the dried carbonates to form a composition containing an oxide of Y, Bi, and Ba in a face-centered cubic phase with a=8.55 Angstroms and having a semi-conductor to metal transition at about 120° K. and also containing a superconducting oxide of YBa 2 Cu 3 as an interconnected phase.
Claim 8
Dependent Claim
78 words
Process comprising reacting superconducting orthorhombic YBa 2 Cu 3 oxide with superconducting Bi 2 Sr 2 CaCu 2 oxide to form a superconducting product consisting essentially of: (I) a nonsuperconducting compound containing oxide of Y, Bi, and Ba, with traces of Sr, Ca, and Cu, having a face-centered cubic phase with a=8.55 Angstroms, and a semi-conductor-to-metal transition at about 120° K.; and (II) a tetragonal superconducting YBa 2 Cu 3 oxide as an interconnected phase throughout the product.
Claim 9
Dependent Claim
78 words
Process comprising reacting superconducting orthorhombic YBa 2 Cu 3 oxide with superconducting Bi 2 Sr 2 CaCu 2 oxide to form a superconducting product consisting essentially of: (I) a nonsuperconducting compound containing oxide of Y, Bi, and Ba, with traces of Sr, Ca, and Cu, having a face-centered cubic phase with a=8.55 Angstroms, and a semi-conductor-to-metal transition at about 120° K.; and (II) a tetragonal superconducting YBa 2 Cu 3 oxide as an interconnected phase throughout the product.
Claim 10
Dependent Claim
45 words
Process according to claim 5 using a reactant ratio of (YBa 2 Cu 3 ).sub.(1-x) (Bi 2 Sr 2 CaCu 2 ) x where x=0.2 whereby in the finished product I is present at about 60 weight % and II at about 40 weight %.
Claim 11
Dependent Claim
19 words
Process according to claim 3, 4, 5, or 6, wherein the calcination is carried out at about 950° C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-07-01 | 1994-12-31 | 1995-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-01 | 1998-12-31 | 1999-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-01 | 2002-12-31 | 2003-07-02 | $7700.00 | Window Closed / Lapsed |