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Comparison of Critical Current Density and Pinning Behaviour of Mono-core MgB2 Wires Prepared by Different Methods

Abstract

Three series of mono-core MgB 2 wires with Nb sheath embedded in Cu subjected to different heat treatments (600 C/300 min, 650 C/30 min and 700 C/30 min) were produced. For each series, three samples with different starting powder mixtures Mg + B (IS), MgH 2 + B (MH) and Mg + B ball milled (ML) were prepared. Hysteresis loops and magnetic relaxations were measured to calculate critical current density (via Bean’s critical state model) and mean effective activation energy (via Anderson’s flux creep theory). Thus, the highest current densities were obtained for IS and the worst superconducting properties were found for MH wires.

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Acknowledgments

B. Brunner wants to thank the Slovak University of Technology for financial support.

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Correspondence to Michael Reissner.

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Brunner, B., Windbichler, A., Reissner, M. et al. Comparison of Critical Current Density and Pinning Behaviour of Mono-core MgB2 Wires Prepared by Different Methods. J Supercond Nov Magn 28, 443–446 (2015). https://doi.org/10.1007/s10948-014-2643-8

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  • DOI: https://doi.org/10.1007/s10948-014-2643-8

Keywords

  • MgB2 wires
  • Magnetic measurements
  • Relaxation measurements
  • Critical current density
  • Pinning behaviour