Improved superconducting properties in Ti-doped MgB2 prepared by two-step reaction method and high-energy ball milling

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Abstract

High Jc Ti-doped MgB2 disks were synthesized by two-step reaction method and high-energy ball milling. In the first step, the sample with a nominal composition of Mg0.8Ti0.2B4 was sintered at 900 °C for 2 h. In the second step, an appropriate amount of Mg was then added to get the stoichiometry of Mg0.9Ti0.1B2, which was milled for 5 h and sintered at 750 °C for 2 h. The phase, microstructure and superconductivity of MgB2 were characterized by means of X-ray diffraction (XRD), scanning electron microscope (SEM) and superconducting quantum interference device (SQUID). The critical current density reaches 6.9 × 104 A cm-2 at 20 K and 1 T. The investigation showed the efficient combination between two-step reaction method and high-energy ball milling is effective to obtain high density and fine grain size bulk MgB2 with high Jc performance.

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Yang, F., Li, S. Q., Yan, G., Feng, J. Q., Xiong, X. M., Zhang, S. N., … Feng, Y. (2015). Improved superconducting properties in Ti-doped MgB2 prepared by two-step reaction method and high-energy ball milling. Journal of Alloys and Compounds, 622, 714–718. https://doi.org/10.1016/j.jallcom.2014.10.186

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