Improved superconducting properties in Ti-doped MgB2 prepared by two-step reaction method and high-energy ball milling
Improved superconducting properties in Ti-doped MgB2 prepared by two-step reaction method and high-energy ball milling
复制标题
两步反应法和高能球磨制备钛掺杂MgB2超导性能的改善
DOI：
10.1016/j.jallcom.2014.10.186
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发表时间：
2015
影响因子：
6.2
通讯作者：
Feng Y.
中科院分区：
文献类型：
--
作者：
Yang F.;Li S. Q.;Yan G.;Feng J. Q.;Xiong X. M.;Zhang S. N.;Wang Q. Y.;Liu G. Q.;Pang Y. C.;Zou H. F.;Li C. S.;Feng Y.
采用两步反应法和高能球磨法制备了高掺钛mgb2圆盘。在第一步中,样本的名义组成Mg0.8Ti0.2B4was烧结在900°C 2 h。在第二步中,适量的Mg随后加入的化学计量学Mg0.9Ti0.1B2,研磨5 h和烧结在750°C 2 h。阶段,微观结构特征和超导MgB2were通过x射线衍射(XRD)、扫描电子显微镜(SEM)和超导量子干涉器件(鱿鱼)。在20 K和1 t条件下，临界电流密度达到6.9 × 104A cm−2。研究表明，两步反应法与高能球磨相结合可以有效地获得高密度、细粒度、高性能的块体mgb2。
HighJcTi-doped MgB2disks were synthesized by two-step reaction method and high-energy ball milling. In the first step, the sample with a nominal composition of Mg0.8Ti0.2B4was 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 MgB2were 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 × 104A cm−2at 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 MgB2with highJcperformance.