Synthesis and stability of Nb3Ge made by electron‐beam codeposition
作者:
A. B. Hallak,
R. H. Hammond,
T. H. Geballe,
期刊:
Applied Physics Letters
(AIP Available online 1976)
卷期:
Volume 29,
issue 5
页码: 314-316
ISSN:0003-6951
年代: 1976
DOI:10.1063/1.89060
出版商: AIP
数据来源: AIP
摘要:
Niobium‐germanium (Nb‐Ge) films which remain superconducting up to about 22.5 °K have been prepared using high‐rate (33–133 A˚/sec) electron‐beam codeposition. The presence of oxygen in the deposition chamber is necessary for stabilizing the high‐TcA15 phase. Analysis of Nb‐Ge films shows that oxygen extends, with some temperature dependence, the Ge‐rich range of theA15 phase with an accompanying decrease in the lattice constant. An amorphous component in the films is first detected below a deposition temperature of 800 °C. It increases rapidly at lower temperatures and becomes dominant at about 600 °C. TheA15 phase diagram was determined for the first time for temperatures below 875 °C.
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