Effect of Citric Acid Doping on Flux Pinning in Bulk MgB2 Prepared by Chemical Solution Route
In this paper, we study the doping effect of citric acid (C6H8O7), from 0 to 30 wt％ of the total MgB2, on the properties, such as critical temperature (Tc), critical current density (Jc), irreversibility field (Hirr) and crystalline structure of MgB2 superconductors. The XRD patterns of samples show a slightly decrease in the a-axis lattice parameter for doped MgB2, due to the partial substitution of carbon at boron site. At 10 K the citric acid doped sample exhibits the Jc values greater than 3.4×105 A/cm2 in self-field, which is similar to the pure one while in high field region the Jc was increased by an order of magnitude in comparison to undoped one. For MgB2 doped with 15 wt％ citric acid, Jc still remains about 103 A/cm2 in 7 T at 10 K. In addition, the self-field Jc of citric acid doped sample is slightly reduced at additive level higher than 10 ％. The improved flux pinning behavior could easily be seen from reduced flux pinning force curves.
MgB2 irreversibility field critical current density flux pinning
Ye Yang Lei Wang Huihui Sun Cuihua Cheng Yong Zhao
Key Laboratory of Advanced Technologies of Materials (Ministry of Education of China), Superconducti Superconductivity Research Group, School of Materials Science and Engineering University of New Sout
国际会议
成都
英文
259-262
2009-09-25（万方平台首次上网日期，不代表论文的发表时间）