An intermetallic powder-in-tube approach to increased flux-pinning in Nb3Sn by internal oxidation of Zr

Motowidlo, Leszek R.; Lee, P. J.; Tarantini, C.; Balachandran, S.; Ghosh, A. K.; Larbalestier, D. C.

doi:10.1088/1361-6668/aa980f

Title: An intermetallic powder-in-tube approach to increased flux-pinning in Nb₃Sn by internal oxidation of Zr

Journal Article · Tue Nov 28 00:00:00 EST 2017 · Superconductor Science and Technology

DOI:https://doi.org/10.1088/1361-6668/aa980f· OSTI ID:1410559

Motowidlo, Leszek R. ^[1];

^[2];

^[2]; Ghosh, A. K. ^[3];

^[2]

Formerly SupraMagnetics Inc., Plantsville, CT (United States)
Florida State Univ., Tallahassee, FL (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)

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-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.

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Research Organization:: Florida State Univ., Tallahassee, FL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: SC0012083

OSTI ID:: 1410559

Journal Information:: Superconductor Science and Technology, Vol. 31, Issue 1; ISSN 0953-2048

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 20 works

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Evidence from EXAFS for Different Ta/Ti Site Occupancy in High Critical Current Density Nb3Sn Superconductor Wires Heald, Steve M.; Tarantini, Chiara; Lee, Peter J. Scientific Reports, Vol. 8, Issue 1 https://doi.org/10.1038/s41598-018-22924-3	journal	March 2018
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Nb3Sn
superconductors
powder-in-tube technique
PIT
flux-pinning
critical current density
artificial pinning centers
APC
Nb1Zr
microstructure

Title: An intermetallic powder-in-tube approach to increased flux-pinning in Nb3Sn by internal oxidation of Zr

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Title: An intermetallic powder-in-tube approach to increased flux-pinning in Nb₃Sn by internal oxidation of Zr