US5053385A
Expired / Lapsed
US
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Preferential orientation of metal oxide superconducting materials
Assignee: Arch Development Corp
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Filing: 1989-08-07
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Granted: 1991-10-01
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Expires: 2009-08-07
Abstract
Abstract A polycrystalline metal oxide such as YBa 2 Cu 3 O 7-X (where 0<X<0.5) exhibits superconducting properties and is capable of conducting very large current densities. By aligning the two-dimensional Cu-O layers which carry the current in the superconducting state in the a- and b-directions, i.e., within the basal plane, a high degree of crystalline axes alignment is provided between adjacent grains permitting the conduction of high current densities.
Inventors
- 👤 Donald W. Capone
- 👤 Roger B. Poeppel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:35
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; C; C30; C30B; C30B1/00; C30B1/12; C30B29/00; C30B29/10; C30B29/16; C30B29/22; C30B29/225; C30B29/60; C30B29/605; C30B33/00; H10N60/20; H10N60/203; Y; Y10; Y10S; Y10S505/00; Y10S505/725; Y10S505/739; Y10S505/74; Y10S505/741
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
190 words
A method of forming a superconducting copper oxide with improved current carrying capacity wherein said superconducting copper oxide has a polycrystalline structure and is anisotropically superconducting having one or more longer crystal axes along which said copper oxide is superconducting, said method comprising the steps of: pressing the superconducting copper oxide into a compact form; heating the compacted superconducting copper oxide to a temperature in the range of 950°-1000° C. for on the order of 20-60 hours to induce large grain growth in the superconducting copper oxide; reducing the superconducting copper oxide to a flake-like, powder form, wherein the copper oxide powder is comprised of particles of singles crystals; and aligning said copper oxide single crystal particles along a preferential direction such that said one or more longer axes of each of said copper oxide crystals are in co-planar alignment, wherein the axes of said copper oxide crystals are along mutually orthogonal a-, b-, and c-directions, and wherein said a- and b-directions define a basal plane of said crystals within which said copper oxide is superconducting and the c-directions of each of said copper oxide crystals are aligned generally parallel.
Claim 2
Independent Claim
190 words
A method of forming a superconducting copper oxide with improved current carrying capacity wherein said superconducting copper oxide has a polycrystalline structure and is anisotropically superconducting having one or more longer crystal axes along which said copper oxide is superconducting, said method comprising the steps of: pressing the superconducting copper oxide into a compact form; heating the compacted superconducting copper oxide to a temperature in the range of 950°-1000° C. for on the order of 20-60 hours to induce large grain growth in the superconducting copper oxide; reducing the superconducting copper oxide to a flake-like, powder form, wherein the copper oxide powder is comprised of particles of singles crystals; and aligning said copper oxide single crystal particles along a preferential direction such that said one or more longer axes of each of said copper oxide crystals are in co-planar alignment, wherein the axes of said copper oxide crystals are along mutually orthogonal a-, b-, and c-directions, and wherein said a- and b-directions define a basal plane of said crystals within which said copper oxide is superconducting and the c-directions of each of said copper oxide crystals are aligned generally parallel.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein said superconducting copper oxide is a rare earth superconducting copper oxide.
Claim 4
Dependent Claim
22 words
The method of claim 2 wherein said rare earth superconducting copper oxide is YBa 2 Cu 3 O 7-X , where 0<X<0.5.
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) | 1994-09-30 | 1995-04-01 | 1995-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-30 | 1999-04-01 | 1999-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-30 | 2003-04-01 | 2003-10-01 | $7700.00 | Window Closed / Lapsed |