Superconducting Properties of Nb_3Al Obtained in a Wide Temperature Range in Nb/Al Multilayer Composite Ribbon

摘要

Superconducting compound Nb_3Al was obtained as a result of thermal treatment of triple-layered Nb/Al/Nb and multilayered Nb/AJ ribbons. The effect of copper on superconducting characteristics of Nb_3/Al diffusive layers formed in Nb/AlCu/Nb composite was studied. The possibility of producing the p (Nb_3Al) phase via diffusion at temperatures below 1000℃ was shown. However, superconducting properties of these ribbons were low. The best superonducting properties had multilayered niobium or duralumin ribbons after heating at 1700℃ for a few seconds.