Abstract
Abstract This paper investigates the crystal structure and superconducting properties of (Nb1-xTix)3Al (x = 0∼5 at%) superconductors fabricated by high-energy ball milling. Trace Nb2Al phase was found in the (Nb1-xTix)3Al samples with x ≤ 1 at%. When the doping amount of Ti is beyond 2 at%, substitution of Nb by Ti in Nb3Al suppresses the formation of Nb2Al phase. Lattice parameters of (Nb1-xTix)3Al was studied by Rietveld refinement of XRD patterns. With the increase of Ti doping amount, the Tc of (Nb1-xTix)3Al presents a decreasing tendency and Nb3Al sample with Ti doped amount of 2 at% displays the smallest ΔTc value of 1.0 K. Moreover, 2 at% Ti doped Nb3Al shows improved Jc performance at high fields. The Kramer plots exhibit that the irreversible field (Birr) of (Nb1-xTix)3Al (x = 0.02) is slightly superior to that of the pure sample with the increase of measurement temperature, which may be due to the improvement of uniformity of A15 superconducting phase. The main flux pinning mechanism of the Nb3Al samples is consistent with the grain boundary pinning.
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