Origin of the enhanced Nb₃Sn performance by combined Hf and Ta doping.

ABSTRACT: In recent years there has been an increasing effort in improving the performance of Nb₃Sn for high-field applications, in particular for the fabrication of conductors suitable for the realization of the Future Circular Collider (FCC) at CERN. This challenging task has led to the investigation of new routes to advance the high-field pinning properties, the irreversibility and the upper critical fields (H_Irr and H_c2, respectively). The effect of hafnium addition to the standard Nb-4Ta alloy has been recently demonstrated to be particularly promising and, in this paper, we investigate the origins of the observed improvements of the superconducting properties. Electron microscopy, Extended X-ray Absorption Fine Structure Spectroscopy (EXAFS) and Atom Probe Tomo

SUBMITTER: Tarantini C 

PROVIDER: S-EPMC8426368 | biostudies-literature | 2021 Sep

REPOSITORIES: biostudies-literature