earticle

영어

Carbon coating approach is used to prepare carbon-doped MgB2 bulk samples using low-cost naphthalene (C10H8) as a carbon source. The coating of carbon (C) on boron (B) powders was achieved by direct pyrolysis of naphthalene at 120 °C and then the C-coated B powders were mixed well with appropriate amount of Mg by solid state reaction method. X-ray diffraction analysis revealed that there is a noticeable shift in (100) and (110) Bragg reflections towards higher angles, while no shift was observed in (002) reflections for MgB2 doped with carbon. As compared to un-doped MgB2, a systematic enhancement in Jc(H) properties with increasing carbon doping level was observed for naphthalene-derived C-doped MgB2 samples. The substantial enhancement in Jc is most likely due to the incorporation of C into MgB2 lattice and the reduction in crystallite size, as evidenced by the increase in the FWHM values for doped samples.