Properties of MgB2 Superconductor by doping impurity of SiC, Graphite, C60, and C nano-tube

Abstract

Since MgB2 superconductor was discovered by Akimitsu, many scientists has been studied this new intermediate temperature superconductor material. Recently Don reported the critical current density and flux pinning of MgB2 is enhanced by doping of SiC nano powder, and Fujii reported MgB2 superconductor made by the powder-in-tube in-situ process using MgH2 as a precursor powder enhanced the critical current density-especially under high magnetic field. Also Matsumoto reported the irreversibility field of MgB2 tape prepared by the in-situ powder in tube process using MgH2 as a precursor powder increased to 23 T by the SiC doping. These results show MgB2 has high potential as a strong candidate for a practical use.

We study the effects of doping nano carbon impurity because graphite has the same structure as the hexagonal Boron structure in MgB2. We added carbon impurities of graphite, C-60, and open-ended carbon nano tube respectively to MgB2 conductors made by powder in tube ex-situ process.