Evidence from EXAFS for Different Ta/Ti Site Occupancy in High Critical Current Density Nb3Sn Superconductor Wires
Abstract
To meet critical current density, J(c), targets for the Future Circular Collider (FCC), the planned replacement for the Large Hadron Collider (LHC), the high field performance of Nb3Sn must be improved, but champion J(c) values have remained static for the last 10 years. Making the A15 phase stoichiometric and enhancing the upper critical field H-c2 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 Nb3Sn strands with J(c) 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-c2 behavior. These new results suggest an important role for dopant and antisite disorder in minimizing superconducting property distributions and maximizing high field J(c) properties.
- Authors:
-
[1];
[2];
[2];
[2];
[3];
[2]
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States). Magnet Division
- Publication Date:
- Research Org.:
- Florida State Univ., Tallahassee, FL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1429849
- Alternate Identifier(s):
- OSTI ID: 1432371
- Grant/Contract Number:
- SC0012083; AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Scientific Reports
- Additional Journal Information:
- Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2045-2322
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; 43 PARTICLE ACCELERATORS; Nb3Sn; superconductors; RRP; microstructure; EXAFS; doping; lattice sites
Citation Formats
Heald, Steve M., Tarantini, Chiara, Lee, Peter J., Brown, Michael D., Sung, ZuHawn, Ghosh, Arup K., and Larbalestier, David C. Evidence from EXAFS for Different Ta/Ti Site Occupancy in High Critical Current Density Nb3Sn Superconductor Wires. United States: N. p., 2018.
Web. doi:10.1038/s41598-018-22924-3.
Heald, Steve M., Tarantini, Chiara, Lee, Peter J., Brown, Michael D., Sung, ZuHawn, Ghosh, Arup K., & Larbalestier, David C. Evidence from EXAFS for Different Ta/Ti Site Occupancy in High Critical Current Density Nb3Sn Superconductor Wires. United States. https://doi.org/10.1038/s41598-018-22924-3
Heald, Steve M., Tarantini, Chiara, Lee, Peter J., Brown, Michael D., Sung, ZuHawn, Ghosh, Arup K., and Larbalestier, David C. Mon .
"Evidence from EXAFS for Different Ta/Ti Site Occupancy in High Critical Current Density Nb3Sn Superconductor Wires". United States. https://doi.org/10.1038/s41598-018-22924-3. https://www.osti.gov/servlets/purl/1429849.
@article{osti_1429849,
title = {Evidence from EXAFS for Different Ta/Ti Site Occupancy in High Critical Current Density Nb3Sn Superconductor Wires},
author = {Heald, Steve M. and Tarantini, Chiara and Lee, Peter J. and Brown, Michael D. and Sung, ZuHawn and Ghosh, Arup K. and Larbalestier, David C.},
abstractNote = {To meet critical current density, J(c), targets for the Future Circular Collider (FCC), the planned replacement for the Large Hadron Collider (LHC), the high field performance of Nb3Sn must be improved, but champion J(c) values have remained static for the last 10 years. Making the A15 phase stoichiometric and enhancing the upper critical field H-c2 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 Nb3Sn strands with J(c) 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-c2 behavior. These new results suggest an important role for dopant and antisite disorder in minimizing superconducting property distributions and maximizing high field J(c) properties.},
doi = {10.1038/s41598-018-22924-3},
journal = {Scientific Reports},
number = 1,
volume = 8,
place = {United States},
year = {Mon Mar 19 00:00:00 EDT 2018},
month = {Mon Mar 19 00:00:00 EDT 2018}
}
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Works referencing / citing this record:
Beneficial influence of Hf and Zr additions to Nb4at%Ta on the vortex pinning of Nb 3 Sn with and without an O source
journal, February 2019
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Ta, Ti and Hf effects on Nb 3 Sn high-field performance: temperature-dependent dopant occupancy and failure of Kramer extrapolation
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