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US5869431A
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Thin film seeds for melt processing textured superconductors for practical applications
Assignee: CHICAGO UNIVERSITY OF OPERATOR OF ARGONNE NATIONAL LABORATORY
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Filing: 1996-04-15
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Granted: 1999-02-09
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Expires: 2016-04-15
Abstract
Abstract A method of fabricating bulk superconducting material such as RBa 2 Cu 3 O 7- δ where R is La or Y comprising depositing a thin epitaxially oriented film of Nd or Sm (123) on an oxide substrate. The powder oxides of RBa 2 Cu 3 O 7- δ or oxides and/or carbonates of R and Ba and Cu present in mole ratios to form RBa 2 Cu 3 O 7- δ, where R is Y or La are heated, in physical contact with the thin film of Nd or Sm (123) on the oxide substrate to a temperature sufficient to form a liquid phase in the oxide or carbonate mixture while maintaining the thin film solid to grow a large single domain 123 superconducting material. Then the material is cooled. The thin film is between 200 Å and 2000 Å. A construction prepared by the method is also disclosed.
Inventors
- 👤 Boyd W. Veal
- 👤 Arvydas Paulikas
- 👤 Uthamalingam Balachandran
- 👤 Wei Zhong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:41
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; H10N60/0296; Y; Y10; Y10S; Y10S505/00; Y10S505/725; Y10S505/733; Y10S505/775; Y10S505/776; Y10S505/779; Y10S505/78
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
191 words
A method of fabricating bulk superconducting material including RBa 2 Cu 3 O 7- δ where R is La or Y comprising depositing a thin epitaxially oriented film of Nd or Sm (123) on the surface of an oxide substrate, wherein the oxide substrate is one or more of SrTiO 3 , LAAlO 3 , cubic stabilized ZrO 2 , PbTiO, Sr 2 RuO 4 , NdGaO 3 , LaCrO 3 , NdCrO 3 , LaFeO 3 , NdFeO 3 ,La 2 CuO 4 , RTiO 3 , where R is La or a rare earth, GdFeO 3 and thereafter heating powder oxides of RBa 2 Cu 3 O 7- δ or oxides and/or carbonates of R and Ba and Cu present in mole ratios to form RBa 2 Cu 3 O 7- δ, where R is Y or La, in physical contact with the thin film of Nd or Sm (123) on the oxide substrate to a temperature sufficient to form a liquid phase in the oxides or oxides and carbonates mixture while maintaining the thin film solid to grow a large single domain 123 superconducting material and thereafter cooling.
Claim 2
Independent Claim
191 words
A method of fabricating bulk superconducting material including RBa 2 Cu 3 O 7- δ where R is La or Y comprising depositing a thin epitaxially oriented film of Nd or Sm (123) on the surface of an oxide substrate, wherein the oxide substrate is one or more of SrTiO 3 , LAAlO 3 , cubic stabilized ZrO 2 , PbTiO, Sr 2 RuO 4 , NdGaO 3 , LaCrO 3 , NdCrO 3 , LaFeO 3 , NdFeO 3 ,La 2 CuO 4 , RTiO 3 , where R is La or a rare earth, GdFeO 3 and thereafter heating powder oxides of RBa 2 Cu 3 O 7- δ or oxides and/or carbonates of R and Ba and Cu present in mole ratios to form RBa 2 Cu 3 O 7- δ, where R is Y or La, in physical contact with the thin film of Nd or Sm (123) on the oxide substrate to a temperature sufficient to form a liquid phase in the oxides or oxides and carbonates mixture while maintaining the thin film solid to grow a large single domain 123 superconducting material and thereafter cooling.
Claim 3
Dependent Claim
9 words
The method of claim 1, wherein R is La.
Claim 4
Dependent Claim
9 words
The method of claim 1, wherein R is Y.
Claim 5
Dependent Claim
17 words
The method of claim 1, wherein R is La and the bulk superconductor also contains 211 material.
Claim 6
Dependent Claim
19 words
The method of claim 1, wherein the thin film is between about 200 Å and about 2000 Å thick.
Claim 7
Dependent Claim
19 words
The method of claim 1, wherein the thin film has an area of at least 1 cm 2 .
Claim 8
Dependent Claim
19 words
The method of claim 1, wherein the thin film has an area up to about 2 cm 2 .
Claim 9
Dependent Claim
110 words
A composite comprising a bulk superconducting material of single domain RBa 2 Cu 3 O 7- δ where R is La or Y or mixtures thereof on a thin epitaxially oriented film of Nd or Sm (123) or mixtures thereof on a ceramic oxide substrate, wherein the oxide substrate is one or more of Sr TiO 3 , LAAlO 3 , cubic stabilized ZrO 2 , PbTiO 3 , Sr 2 RuO 4 , Nd GaO 3 , LaCrO 3 , NdCrO 3 , LaFeO 3 , NdFeO 3 , La 2 CuO 4 , RTiO 3 , where R is La or a rare earth and GdFeO 3 .
Claim 10
Dependent Claim
110 words
A composite comprising a bulk superconducting material of single domain RBa 2 Cu 3 O 7- δ where R is La or Y or mixtures thereof on a thin epitaxially oriented film of Nd or Sm (123) or mixtures thereof on a ceramic oxide substrate, wherein the oxide substrate is one or more of Sr TiO 3 , LAAlO 3 , cubic stabilized ZrO 2 , PbTiO 3 , Sr 2 RuO 4 , Nd GaO 3 , LaCrO 3 , NdCrO 3 , LaFeO 3 , NdFeO 3 , La 2 CuO 4 , RTiO 3 , where R is La or a rare earth and GdFeO 3 .
Claim 11
Dependent Claim
20 words
The composite of claim 8, wherein the bulk superconducting material contains a minor amount of Y 2 BaCuO 5 .
Claim 12
Dependent Claim
19 words
The composite of claim 8, wherein the thin film is between about 200 Å and about 2000 Å thick.
Claim 13
Dependent Claim
19 words
The composite of claim 8, wherein the thin film has an area of at least 1 cm 2 .
Claim 14
Dependent Claim
19 words
The composite of claim 10, wherein the thin film has an area up to about 2 cm 2 .
References Cited (Backward Citations)
US5308799A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 7.5 Years (Year 8) | 2006-02-08 | 2006-08-10 | 2007-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-02-08 | 2010-08-10 | 2011-02-09 | $7700.00 | Window Closed / Lapsed |