Method for preparing high transition temperature Nb.sub.3 Ge sup

Details Method for preparing high transition temperature Nb.sub.3 Ge sup Method for preparing high transition temperature Nb.sub.3 Ge sup

1975-06-26

1977-10-18

Kendall, Ralph S.

Coating processes

Electrical product produced

Superconductor

29599, 423492, 75134G, 75174, 427124, 427250, H01L 3912

Patent

active

040546861

ABSTRACT:
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.

REFERENCES:
patent: 3525637 (1970-08-01), Kim
patent: 3556842 (1971-01-01), Kim
patent: 3573978 (1971-04-01), Kim et al.
patent: 3630769 (1971-12-01), Hart
patent: 3665595 (1972-05-01), Tanaka
Carpenter, The Composition, Range, Decomposition...Nb.sub.3 Ge, pp. 2141-2144, vol. 67, (10-1963).
Hardbook of Prep. Inorganic Chemistry, Edited by George Bauer, vol. 2, pp. 1302-1303, 1305, 1311 (1965).

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