Improved Transport Jc in MgB2 Tapes by Graphene Doping

Shaopu Tang, Dongliang Wang, Xianping Zhang, Qianjun Zhang, Chen Li, Yanwei Ma, Hidetoshi Oguro, Satoshi Awaji, Kazuo Watanabe

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Graphene is a special form of carbon which can effectively enhance the critical current density Jc of MgB2. In this work, a systematic investigation on the impact of sintering conditions and doping level was carried out for graphene-doped MgB2 tapes. It is found that an appropriate addition level, i.e., 8 at% in this work, is very critical to obtain a high Jc in graphene-doped samples. The critical field and pinning force are improved obviously due to the graphene doping. The magnetic Jc of samples sintered at 800 °C with 8 at% graphene doping reached 1.78 × 104 A/cm2, at 5 T, 20 K. At the same time, the transport Jc was up to 2.38 × 104 A/cm2 at 10 T, 4.2 K. The lattice distortion caused by C substitution and residual C at the grain boundaries were thought to be the major factors affecting the Jc of graphene-doped MgB2 samples.

Original languageEnglish
Pages (from-to)2699-2705
Number of pages7
JournalJournal of Superconductivity and Novel Magnetism
Volume27
Issue number12
DOIs
Publication statusPublished - 2014 Nov 18

Keywords

  • Graphene doping
  • MgB2 tapes
  • Transport J

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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