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Evidence from EXAFS for Different Ta/Ti Site Occupancy in High Critical Current Density NbSn Superconductor Wires.

Title: Evidence from EXAFS for Different Ta/Ti Site Occupancy in High Critical Current Density NbSn Superconductor Wires.
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Name(s): Heald, Steve M, author
Tarantini, Chiara, author
Lee, Peter J, author
Brown, Michael D, author
Sung, ZuHawn, author
Ghosh, Arup K, author
Larbalestier, David C, author
Type of Resource: text
Genre: Journal Article
Text
Date Issued: 2018-03-19
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: To meet critical current density, J , targets for the Future Circular Collider (FCC), the planned replacement for the Large Hadron Collider (LHC), the high field performance of NbSn must be improved, but champion J values have remained static for the last 10 years. Making the A15 phase stoichiometric and enhancing the upper critical field H by Ti or Ta dopants are the standard strategies for enhancing high field performance but detailed recent studies show that even the best modern wires have broad composition ranges. To assess whether further improvement might be possible, we employed Extended X-ray Absorption Fine Structure (EXAFS) to determine the lattice site location of dopants in modern high-performance NbSn strands with J values amongst the best so far achieved. Although Ti and Ta primarily occupy the Nb sites in the A15 structure, we also find significant Ta occupancy on the Sn site. These findings indicate that the best performing Ti-doped stand is strongly sub-stoichiometric in Sn and that antisite disorder likely explains its high average H behavior. These new results suggest an important role for dopant and antisite disorder in minimizing superconducting property distributions and maximizing high field J properties.
Identifier: FSU_pmch_29555921 (IID), 10.1038/s41598-018-22924-3 (DOI), PMC5859093 (PMCID), 29555921 (RID), 29555921 (EID), 10.1038/s41598-018-22924-3 (PII)
Publication Note: This NIH-funded author manuscript originally appeared in PubMed Central at https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5859093.
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_pmch_29555921
Host Institution: FSU
Is Part Of: Scientific reports.
2045-2322
Issue: iss. 1, vol. 8

Choose the citation style.
Heald, S. M., Tarantini, C., Lee, P. J., Brown, M. D., Sung, Z. H., Ghosh, A. K., & Larbalestier, D. C. (2018). Evidence from EXAFS for Different Ta/Ti Site Occupancy in High Critical Current Density NbSn Superconductor Wires. Scientific Reports. Retrieved from http://purl.flvc.org/fsu/fd/FSU_pmch_29555921