By Topic

Investigation on the Effect of Ta Additions on Jc and n of (Nb,Ti)3Sn Bronze Processed Multifilamentary Wires at High Magnetic Fields

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

6 Author(s)
V. Abacherli ; Eur. Adv. Supercond., Hanau ; F. Buta ; D. Uglietti ; C. Senatore
more authors

We have analyzed the influence of Ta on the superconducting properties of Ti doped bronze processed (Nb, Ta, Ti)3Sn multifilamentary wires. The study was carried out on wires with identical configuration, consisting of 14,641 filaments with 4.5 mum diameter embedded in a Ti bearing Osprey bronze and externally stabilized by copper. Several wires were made using either Nb7.5Ta or pure Nb as a filament material, some of them containing a core of NbTi as a supplementary Ti source. All wires were manufactured by three hot extrusion steps, cold drawing and several intermediate anneals. Wire samples with round and rectangular cross sections have been prepared and reacted with various heat treatments between 550 and 730degC. The residual Sn content in the Cu-Sn-Ti bronze after reaction and the degree of reaction of the filaments were determined by means of EDS and SEM analysis, respectively. AC susceptibility has been used to determine the effect of prestrain and doping on the superconducting transition temperature Tc.2 At 21 T and 4.2 K, similar non-Cu Jc values up to 90 A/mm2 (overall Jc: 63 A/mm2 ) and n values up to 25 have been observed on both compositions (Nb, Ta, Ti)3Sn and (Nb, Ti)3Sn. These results suggest that Ta as a quaternary dopant does not lead to further improvements of Jc and n of ternary (Nb, Ti)3Sn.

Published in:

IEEE Transactions on Applied Superconductivity  (Volume:17 ,  Issue: 2 )