Improved Superconducting Properties in Bulk MgB2 Prepared by High Energy Milling of Mg and B Powder
Y. F. Wu, Y. F. Lu, G. Yan, J. S. Li, Y. Feng, H. P. Tang, S. K. Chen, H. L. Xu, C. S. Li, P. X. Zhang
Abstract
The MgB2 bulks were prepared by high energy milling of Mg and B powder. The correlations among milling times, microstructure and superconducting properties were investigated in MgB2 bulks. Samples were characterized by x-ray diffraction (XRD), energy dispersive spectrometry (EDX) and scanning electron microscope (SEM), and the magnetization properties were examined by a Superconducting quantum interfere device (SQUID) magnetometer. It showed that the high energy milling is an effective approach to get fine crystalline (40-100nm) bulk MgB2 with good grain connectivity and high Jc performance. The critical current density reaches to 2.0X10E6A/cm2 at 15K and 0.59T, 5.7X10E5A/cm2 at 2T and 3.0X10E4A/cm2 at 5T.
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