The doping effect of activated carbon on the superconducting properties of MgB2 tapes

Xianping Zhang, Dongliang Wang, Zhaoshun Gao, Lei Wang, Yanwei Ma, Zhiping Qi, Kazuo Watanabe

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Activated carbon doped MgB2 tapes were prepared by the in situ powder-in-tube method. The phase, crystal structure, microstructure, resistance, etc were analyzed by x-ray diffraction (XRD), scanning electron microscopy (SEM) and a physical properties measurement system (PPMS). It was found that the irreversibility field (Hirr) and upper critical field (H c2) were enhanced when MgB2 samples were doped with activated carbon, and the magnetic field dependence of the critical current density (Jc) was improved significantly. For the 5% activated carbon doped MgB2 tapes, the Jc value was nearly eight times higher than that of undoped tapes at 13 T (4.2 K). On the other hand, the activated carbon doping level has a significant effect on the Jc values of MgB2 tapes. When the doping level is higher than 5%, the Jc values decrease with increasing activated carbon doping level.

Original languageEnglish
Article number075008
JournalSuperconductor Science and Technology
Volume21
Issue number7
DOIs
Publication statusPublished - 2008 Jul 1

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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