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Nb3Sn wires are now very close to their final optimization but despite itsclassical nature, detailed understanding of the role of Ta and Ti doping in theA15 is not fully understood. Long thought to be essentially equivalent in theirinfluence on Hc2, they were interchangeably applied. Here we show that Tiproduces significantly more homogeneous chemical and superconductingproperties. Despite Ta-doped samples having a slightly higher Tc onset inzero-field, they always have a wider Tc-distribution. In particular, whereasthe Ta-doped A15 has a Tc-distribution extending from 18 down to 5-6 K (thelowest expected Tc for the binary A15 phase), the Ti-doped samples have no A15phase with Tc below 12 K. The much narrower Tc distribution in the Ti-dopedsamples has a positive effect on their in-field Tc-distribution too, leading toan extrapolated Hc2(0) 2 Tesla larger than the Ta-doped one. Ti-doping alsoappears to be very homogeneous even when the Sn content is reduced in order toinhibit breakdown of the diffusion barriers in very high Jc conductors. Theenhanced homogeneity of the Ti-doped samples appears to result from itsassistance of rapid diffusion of Sn into the filaments and by its incorporationinto the A15 phase interchangeably with Sn on the Sn sites of the A15 phase.

Significant enhancement of compositional and superconducting homogeneity in Ti rather than Ta-doped Nb3Sn