Abstract
A preliminary study has been carried out in which the A15 phase of the Nb-Al-Ge system was synthesised by sintering compacts of mixed elemental powders at 1673, 1873 and 2073 K, for periods of up to 120 min. Onset superconducting transition temperatures of ⩽ 18.9 K were obtained which were increased to ⩽ 19.8 K by a secondary heat treatment at 1073 K. Metallographie observations and results from electron microprobe analysis are reported, and the mechanism of A15 phase formation is discussed. Some consideration is given to the future development of the technique.
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