Carbon nanohorn doping in MgB2 wire prepared by suspension spinning

Eriko Ban, Ryoji Sakaguchi, Yoshiharu Matsuoka, Tomoko Goto, Kazuo Watanabe, Gen Nishijima

Research output: Contribution to journalConference articlepeer-review

15 Citations (Scopus)


Carbon nanohorn (CNH) doping in MgB2 wire prepared by suspension spinning was studied to enhance flux pinning. The mixed powders of MgB 2 and CNH with nominal composition of (MgB2) 0.95C0.05 were suspended in a mixed poly(vinyl alcohol) solution. The as-drawn filaments were hot-pressed under 20 MPa at 200 °C for 8 h. The samples were enveloped by an iron sheet with a pellet of mixed powder of Mg and B and vacuum-sealed in a fused quartz tube, and then sintered at the temperature ranging from 885 °C to 900 °C for 2-3 h. The superconductivity of the samples was studied by electrical resistivity and SQUID method. Serious deterioration of Tc was not observed for the doped sample. The CNH doping resulted in enhancement of the transport Jc values at 4.2 K in high fields ranging from 6 T to 10 T by sintering at 885 °C for 2 h. The superconductivity at 4.2 K was maintained by applying the field of 14 T for the doped sample sintered at 900 °C for 3 h.

Original languageEnglish
Pages (from-to)1249-1253
Number of pages5
JournalPhysica C: Superconductivity and its applications
Issue numberII
Publication statusPublished - 2005
Externally publishedYes
EventProceedings of the 17th Internatioanl Symposium on Superconductivity (ISS 2004) Advances in Superconductivity -
Duration: 2004 Nov 232004 Nov 25


  • Carbon nanohorn doping
  • Critical current density
  • Magnesium diboride wire
  • Magnetic field behavior

ASJC Scopus subject areas

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


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