US4054686A
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Method for preparing high transition temperature Nb3 Ge superconductors
Assignee: Energy Research and Development Administration ERDA
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Filing: 1975-06-26
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Granted: 1977-10-18
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Expires: 1995-06-26
Abstract
Abstract Bulk coatings of Nb 3 Ge superconductors having transition temperatures in excess of 20 K are readily formed by a chemical vapor deposition technique involving the coreduction of NbCl 5 and GeCl 4 in the presence of hydrogen. The NbCl 5 vapor may advantageously be formed quantitatively in the temperature range of about 250° to 260° C by the chlorination of Nb metal provided the partial pressure of the product NbCl 5 vapor is maintained at or below about 0.1 atm.
Inventors
- 👤 Lawrence R. Newkirk
- 👤 Flavio A. Valencia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:06
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/01; H10N60/0184; Y; Y10; Y10S; Y10S420/00; Y10S420/901; Y10S505/00; Y10S505/80; Y10S505/815; Y10S505/818; Y10S505/819; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49014
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
110 words
In a method of forming bulk coatings of high transition temperature Nb 3 Ge superconductors by the coreduction of flowing Nb and Ge chlorides in the presence of flowing hydrogen, the improvement comprising quantitatively forming NbCl 5 vapor at a desired rate by flowing Cl 2 gas at a desired rate over an excess of Nb metal at a temperature in the range of about 250° to about 260° C, the partial pressure of said NbCl 5 vapor in the presence of said Nb metal being maintained at about 0.1 atm or less, and using said NbCl 5 vapor as the source of the Nb chloride used in said coreduction.
Claim 2
Dependent Claim
110 words
In a method of forming bulk coatings of high transition temperature Nb 3 Ge superconductors by the coreduction of flowing Nb and Ge chlorides in the presence of flowing hydrogen, the improvement comprising quantitatively forming NbCl 5 vapor at a desired rate by flowing Cl 2 gas at a desired rate over an excess of Nb metal at a temperature in the range of about 250° to about 260° C, the partial pressure of said NbCl 5 vapor in the presence of said Nb metal being maintained at about 0.1 atm or less, and using said NbCl 5 vapor as the source of the Nb chloride used in said coreduction.
Claim 3
Dependent Claim
33 words
The method of claim 1 wherein said partial pressure is maintained at a desired level by mixing an appropriate amount of inert gas with said Cl 2 gas flowing over said Nb metal.
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) | 1980-10-17 | 1981-04-18 | 1981-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-17 | 1985-04-18 | 1985-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-17 | 1989-04-18 | 1989-10-18 | $7700.00 | Window Closed / Lapsed |