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Title: An intermetallic powder-in-tube approach to increased flux-pinning in Nb 3Sn by internal oxidation of Zr

We report on the development of multifilamentary Nb 3Sn superconductors by a versatile powder-in-tube technique (PIT) that demonstrates a simple pathway to a strand with a higher density of flux-pinning sites that has the potential to increase critical current density beyond present levels. The approach uses internal oxidation of Zr-alloyed Nb tubes to produce Zr oxide particles within the Nb 3Sn layer that act as a dispersion of artificial pinning centres (APCs). In this design, SnO 2 powder is mixed with Cu 5Sn 4 powder within the PIT core that supplies the Sn for the A15 reaction with Nb1Zr filament tubes. Initial results show an average grain size of ~38 nm in the A15 layer, compared to the 90–130 nm of typical APC-free high-J c strands made by conventional PIT or Internal Sn processing. Furthermore, there is a shift in the peak of the pinning force curve from H/H irr of ~0.2 to ~0.3 and the pinning force curves can be deconvoluted into grain boundary and point-pinning components, the point-pinning contribution dominating for the APC Nb-1wt%Zr strands.
Authors:
 [1] ; ORCiD logo [2] ; ORCiD logo [2] ; ORCiD logo [2] ;  [3] ; ORCiD logo [2]
  1. Formerly SupraMagnetics Inc., Plantsville, CT (United States)
  2. Florida State Univ., Tallahassee, FL (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Grant/Contract Number:
SC0012083
Type:
Accepted Manuscript
Journal Name:
Superconductor Science and Technology
Additional Journal Information:
Journal Volume: 31; Journal Issue: 1; Journal ID: ISSN 0953-2048
Publisher:
IOP Publishing
Research Org:
Florida State Univ., Tallahassee, FL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; 43 PARTICLE ACCELERATORS; Nb3Sn; superconductors; powder-in-tube technique; PIT; flux-pinning; critical current density; artificial pinning centers; APC; Nb1Zr; microstructure
OSTI Identifier:
1410559

Motowidlo, Leszek R., Lee, P. J., Tarantini, C., Balachandran, S., Ghosh, A. K., and Larbalestier, D. C.. An intermetallic powder-in-tube approach to increased flux-pinning in Nb3Sn by internal oxidation of Zr. United States: N. p., Web. doi:10.1088/1361-6668/aa980f.
Motowidlo, Leszek R., Lee, P. J., Tarantini, C., Balachandran, S., Ghosh, A. K., & Larbalestier, D. C.. An intermetallic powder-in-tube approach to increased flux-pinning in Nb3Sn by internal oxidation of Zr. United States. doi:10.1088/1361-6668/aa980f.
Motowidlo, Leszek R., Lee, P. J., Tarantini, C., Balachandran, S., Ghosh, A. K., and Larbalestier, D. C.. 2017. "An intermetallic powder-in-tube approach to increased flux-pinning in Nb3Sn by internal oxidation of Zr". United States. doi:10.1088/1361-6668/aa980f.
@article{osti_1410559,
title = {An intermetallic powder-in-tube approach to increased flux-pinning in Nb3Sn by internal oxidation of Zr},
author = {Motowidlo, Leszek R. and Lee, P. J. and Tarantini, C. and Balachandran, S. and Ghosh, A. K. and Larbalestier, D. C.},
abstractNote = {We report on the development of multifilamentary Nb3Sn superconductors by a versatile powder-in-tube technique (PIT) that demonstrates a simple pathway to a strand with a higher density of flux-pinning sites that has the potential to increase critical current density beyond present levels. The approach uses internal oxidation of Zr-alloyed Nb tubes to produce Zr oxide particles within the Nb3Sn layer that act as a dispersion of artificial pinning centres (APCs). In this design, SnO2 powder is mixed with Cu5Sn4 powder within the PIT core that supplies the Sn for the A15 reaction with Nb1Zr filament tubes. Initial results show an average grain size of ~38 nm in the A15 layer, compared to the 90–130 nm of typical APC-free high-Jc strands made by conventional PIT or Internal Sn processing. Furthermore, there is a shift in the peak of the pinning force curve from H/H irr of ~0.2 to ~0.3 and the pinning force curves can be deconvoluted into grain boundary and point-pinning components, the point-pinning contribution dominating for the APC Nb-1wt%Zr strands.},
doi = {10.1088/1361-6668/aa980f},
journal = {Superconductor Science and Technology},
number = 1,
volume = 31,
place = {United States},
year = {2017},
month = {11}
}