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Title: Method for preparing high transition temperature Nb.sub.3 Ge superconductors

Bulk coatings of Nb.sub.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.sub.5 and GeCl.sub.4 in the presence of hydrogen. The NbCl.sub.5 vapor may advantageously be formed quantitatively in the temperature range of about 250.degree. to 260.degree. C by the chlorination of Nb metal provided the partial pressure of the product NbCl.sub.5 vapor is maintained at or below about 0.1 atm.
Inventors:
 [1];  [2]
  1. (Los Alamos, NM)
  2. (Santa Fe, NM)
Issue Date:
OSTI Identifier:
862943
Assignee:
United States of America as represented by United States Energy (Washington, DC) LANL
Patent Number(s):
US 4054686
Research Org:
Los Alamos National Laboratory (LANL), Los Alamos, NM
Country of Publication:
United States
Language:
English
Subject:
method; preparing; transition; temperature; nb; superconductors; bulk; coatings; temperatures; excess; 20; readily; formed; chemical; vapor; deposition; technique; involving; coreduction; nbcl; gecl; presence; hydrogen; advantageously; quantitatively; range; 250; degree; 260; chlorination; metal; provided; partial; pressure; product; maintained; below; atm; chemical vapor; temperature range; vapor deposition; partial pressure; transition temperature; readily formed; transition temperatures; deposition technique; bulk coatings; /427/29/420/423/505/