US5057488A
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Synthesis of Bi-Pb-Ca-Sr-Cu-O superconductive material
Assignee: General Electric Co
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Filing: 1990-02-12
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Granted: 1991-10-15
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Expires: 2010-02-12
Abstract
Abstract A reactant particulate mixture comprised of Bi 2 CaSr 2 Cu 2 O 8 ±x where x ranges from 0 to 0.5, Ca 2 CuO 3 , cupric oxide and lead oxide is formulated and reacted to produce superconductive Bi 2-y Pb y Ca 2 Sr 2 Cu 3 O 10 ±z where y ranges from 0.1 to 0.5 and z ranges from zero to less than 1.
Inventors
- 👤 Ronald H. Arendt
- 👤 Mary F. Garbauskas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:57
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; C; C01; C01G; C01G29/00; C01G29/006; C04; C04B; C04B35/00; C04B35/01; C04B35/45; C04B35/4521; C04B35/4525; C01P; C01P2006/00; C01P2006/32; C01P2006/40; Y; Y10; Y10S; Y10S505/00; Y10S505/775; Y10S505/776; Y10S505/782
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
149 words
A process for producing a solid superconductive material in powder form containing superconductive Bi 2-y Pb y Ca 2 Sr 2 Cu 3 O 10 ±z phase, in which y ranges from 0.1 to 0.5 and z ranges from zero to less than 1, which comprises providing a particulate mixture of reactants consisting essentially of Bi 2 CaSr 2 Cu 2 O 8 ±y, x being between zero and 0.5, Ca 2 Cu O 3 , cupric oxide, and lead oxide, in proportions for forming said superconductive phase, the Ca 2 CuO 3 and cupric oxide in said mixture being present in approximately equal molar amounts; heating the mixture in an oxidizing atmosphere at a temperature ranging from about 820° C. to about 860° C. to form a reaction product comprising superconductive phase; cooling the reaction product in an oxidizing atmosphere; and comminuting the reaction product to produce powder.
Claim 2
Dependent Claim
149 words
A process for producing a solid superconductive material in powder form containing superconductive Bi 2-y Pb y Ca 2 Sr 2 Cu 3 O 10 ±z phase, in which y ranges from 0.1 to 0.5 and z ranges from zero to less than 1, which comprises providing a particulate mixture of reactants consisting essentially of Bi 2 CaSr 2 Cu 2 O 8 ±y, x being between zero and 0.5, Ca 2 Cu O 3 , cupric oxide, and lead oxide, in proportions for forming said superconductive phase, the Ca 2 CuO 3 and cupric oxide in said mixture being present in approximately equal molar amounts; heating the mixture in an oxidizing atmosphere at a temperature ranging from about 820° C. to about 860° C. to form a reaction product comprising superconductive phase; cooling the reaction product in an oxidizing atmosphere; and comminuting the reaction product to produce powder.
Claim 3
Dependent Claim
13 words
The process according to claim 1 in which the oxidizing atmosphere is air.
Claim 4
Dependent Claim
21 words
The process according to claim 2 wherein the superconductive phase constitutes at least about 90 weight percent of the reaction product.
References Cited (Backward Citations)
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| 3.5 Years (Year 4) | 1994-10-14 | 1995-04-15 | 1995-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-14 | 1999-04-15 | 1999-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-14 | 2003-04-15 | 2003-10-15 | $7700.00 | Window Closed / Lapsed |