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Title: Evidence from EXAFS for Different Ta/Ti Site Occupancy in High Critical Current Density Nb 3Sn Superconductor Wires

Abstract

To meet critical current density, Jc, targets for the Future Circular Collider (FCC), the planned replacement for the Large Hadron Collider (LHC), the high field performance of Nb 3Sn 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 EXAFS to determine the lattice site location of dopants in modern high-performance Nb 3Sn 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:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [3];  [4]; ORCiD logo [2]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  2. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
  3. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). Magnet Division
Publication Date:
Research Org.:
Florida State Univ., Tallahassee, FL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
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. doi: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. doi: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, Jc, 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 Jc values have remained static for the last 10 years. Making the A15 phase stoichiometric and enhancing the upper critical field Hc2 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 EXAFS to determine the lattice site location of dopants in modern high-performance Nb3Sn strands with Jc 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 Hc2 behavior. These new results suggest an important role for dopant and antisite disorder in minimizing superconducting property distributions and maximizing high field Jc properties.},
doi = {10.1038/s41598-018-22924-3},
journal = {Scientific Reports},
number = 1,
volume = 8,
place = {United States},
year = {2018},
month = {3}
}

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Works referenced in this record:

Advanced Accelerator Magnets for Upgrading the LHC
journal, June 2012

  • Bottura, L.; de Rijk, G.; Rossi, L.
  • IEEE Transactions on Applied Superconductivity, Vol. 22, Issue 3
  • DOI: 10.1109/TASC.2012.2186109

Influence of Ti and Ta doping on the irreversible strain limit of ternary Nb 3 Sn superconducting wires made by the restacked-rod process
journal, April 2010


ATHENA , ARTEMIS , HEPHAESTUS : data analysis for X-ray absorption spectroscopy using IFEFFIT
journal, June 2005


Temperature and Purity Dependence of the Superconducting Critical Field, H c 2 . III. Electron Spin and Spin-Orbit Effects
journal, July 1966


Significant enhancement of compositional and superconducting homogeneity in Ti rather than Ta-doped Nb3Sn
journal, January 2016

  • Tarantini, C.; Sung, Z-H.; Lee, P. J.
  • Applied Physics Letters, Vol. 108, Issue 4
  • DOI: 10.1063/1.4940726

Performance Boost in Industrial Multifilamentary Nb3Sn Wires due to Radiation Induced Pinning Centers
journal, June 2015

  • Baumgartner, T.; Eisterer, M.; Weber, H. W.
  • Scientific Reports, Vol. 5, Issue 1
  • DOI: 10.1038/srep10236

The physical and structural properties of superconducting A15-type Nb-Sn alloys
journal, August 1981

  • Devantay, H.; Jorda, J. L.; Decroux, M.
  • Journal of Materials Science, Vol. 16, Issue 8
  • DOI: 10.1007/BF00542375

Calculated site substitution in ternary γ | I H - Ni 3 Al: Temperature and composition effects
journal, January 1997


Correlation Between the Number of Displacements Per Atom and After High-Energy Irradiations of Nb 3 Sn Wires for the HL-LHC
journal, April 2016

  • Spina, T.; Scheuerlein, C.; Richter, D.
  • IEEE Transactions on Applied Superconductivity, Vol. 26, Issue 3
  • DOI: 10.1109/TASC.2016.2549858

The 16 T Dipole Development Program for FCC
journal, June 2017

  • Tommasini, Davide; Auchmann, B.; Bajas, Hugues
  • IEEE Transactions on Applied Superconductivity, Vol. 27, Issue 4
  • DOI: 10.1109/TASC.2016.2634600

Examination of the trade-off between intrinsic and extrinsic properties in the optimization of a modern internal tin Nb 3 Sn conductor
journal, April 2014


Scaling laws for flux pinning in hard superconductors
journal, March 1973

  • Kramer, Edward J.
  • Journal of Applied Physics, Vol. 44, Issue 3
  • DOI: 10.1063/1.1662353

Performance of the First Short Model 150-mm-Aperture Nb3Sn Quadrupole MQXFS for the High-Luminosity LHC Upgrade
journal, June 2017

  • Chlachidze, Guram; Ambrosio, Giorgio; Anerella, Michael
  • IEEE Transactions on Applied Superconductivity, Vol. 27, Issue 4
  • DOI: 10.1109/TASC.2016.2629001

The role of disorder in maximizing the upper critical field in the Nb-Sn system
journal, January 1981


Mössbauer study of the hydrides of Nb3Me with A15 structure
journal, August 1991


Internally Oxidized Nb 3 Sn Strands with Fine Grain Size and High Critical Current Density
journal, January 2015

  • Xu, Xingchen; Sumption, Michael D.; Peng, Xuan
  • Advanced Materials, Vol. 27, Issue 8
  • DOI: 10.1002/adma.201404335

The PNC/XOR X-ray microprobe station at APS sector 20
journal, November 2007

  • Heald, S. M.; Cross, J. O.; Brewe, D. L.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 582, Issue 1
  • DOI: 10.1016/j.nima.2007.08.109

Crystal site determination of dilute alloying elements in polycrystalline Nb 3 Sn superconductors using a transmission electron microscope
journal, June 1984

  • Tafto, J.; Suenaga, M.; Welch, D. O.
  • Journal of Applied Physics, Vol. 55, Issue 12
  • DOI: 10.1063/1.333045

Relativistic calculations of spin-dependent x-ray-absorption spectra
journal, July 1997


A bent Laue analyzer detection system for dilute fluorescence XAFS
conference, January 2000

  • Karanfil, C.
  • The 11th US national synchrotron radiation instrumentation conference (SRI99), AIP Conference Proceedings
  • DOI: 10.1063/1.1291781

An intermetallic powder-in-tube approach to increased flux-pinning in Nb 3 Sn by internal oxidation of Zr
journal, November 2017

  • Motowidlo, L. R.; Lee, P. J.; Tarantini, C.
  • Superconductor Science and Technology, Vol. 31, Issue 1
  • DOI: 10.1088/1361-6668/aa980f

Long-range order and the electrical resistivity
journal, July 1980


Microstructure, composition and critical current density of superconducting Nb3Sn wires
journal, July 2008


Atomic-scale study of diffusion in A15 Nb 3 Sn
journal, February 2007


Optimization of Nb 3 Sn and MgB 2 wires
journal, March 2008