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Processing of Bulk Nanocrystalline Metals at the US Army Research Laboratory
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High Performance Bi-2212 Round Wires Made with Recent Powders.

J Jiang1, G Bradford2, S I Hossain2

  • 1Applied Superconductivity Center, National High Magnetic Laboratory, Tallahassee, FL 32310, USA and also with Florida State University.

IEEE Transactions on Applied Superconductivity : a Publication of the IEEE Superconductivity Committee
|March 19, 2021
PubMed
Summary
This summary is machine-generated.

Bismuth-2212 round wire, a high-temperature superconductor, shows improved critical current density thanks to overpressure heat treatment. This advancement makes it a promising conductor for high-field magnets in NMR and accelerators.

Keywords:
Bi-2212 wireSuperconductorcritical current densitysuperconducting magnet

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Superconductivity

Background:

  • Multifilamentary Bismuth Strontium Calcium Copper Oxide (Bi-2212) wire is the only high-temperature superconductor available in a round shape, ideal for magnet construction.
  • The powder-in-tube technique is used to manufacture Bi-2212 wire.
  • Significant improvements in critical current density (Jc) for Bi-2212 round wire have been achieved through overpressure heat treatment.

Purpose of the Study:

  • To investigate the impact of precursor powder composition and heat treatment parameters on the superconducting properties of Bi-2212 wires.
  • To analyze the microstructural characteristics of Bi-2212 wires subjected to optimized processing conditions.
  • To evaluate the performance of recent Bi-2212 wires for potential applications in high-field magnets.

Main Methods:

  • Fabrication of Bi-2212 wires using the powder-in-tube method.
  • Application of optimized overpressure heat treatment processes.
  • Characterization of superconducting properties, including critical current density (Jc) at various magnetic fields and temperatures.
  • Microstructural analysis of the processed Bi-2212 wires.

Main Results:

  • Short samples of Bi-2212 wire processed with optimized overpressure conditions demonstrated high critical current densities.
  • Achieved Jc values at 4.2 K were 6640 A/mm² at 15 T and 4670 A/mm² at 30 T.
  • Engineering critical current densities were reported as 1320 A/mm² at 15 T and 930 A/mm² at 30 T (4.2 K).

Conclusions:

  • Optimized overpressure heat treatment significantly enhances the superconducting performance of Bi-2212 round wires.
  • The improved critical current densities make Bi-2212 wire a highly promising conductor for demanding applications like very high-field NMR and accelerator magnets.
  • Bi-2212 wire is commercially available in long lengths and various architectures, facilitating its use in magnet technology.