High critical current of Cu-sheathed MgB2 wire at 20 K

H. Fang, P. Gijavanekar, Y. X. Zhou, G. Liang, P. T. Putman, K. Salama

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


For large-scale electric power applications of MgB2 wire, especially at AC environments, development of nonmagnetic sheath material is essential. In this study, Cu-sheathed MgB2 wire was fabricated using the powder-in-tube method and ultra-fine Mg and B precursor prepared by high-energy ball milling. Lowering the annealing temperature and shortening the annealing time effectively limit the reaction between Mg and Cu. Critical current density of the wire annealed at 700° C for 5 minutes is 4.3 × 104 A/cm2 at 20 K and self-field. Adding excess Mg in precursor further enhances critical current to 250 A at 20 K and self-field. These results demonstrate the potential of Cu-sheathed MgB2 wires for large-scale applications.

Original languageEnglish (US)
Pages (from-to)3215-3218
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number2 PART III
StatePublished - Jun 2005


  • Copper sheath
  • Critical current density
  • Magnesium diboride
  • Powder-in-tube

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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