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http://dx.doi.org/10.9714/psac.2017.19.1.036

Enhanced critical current density of in situ processed MgB2 bulk superconductors with MgB4 additions  

Kim, S.H. (Korea Atomic Energy Research Institute)
Kang, W.N. (Sungkyunkwan University)
Jun, B.H. (Korea Atomic Energy Research Institute)
Lee, Y.J. (Korea Atomic Energy Research Institute)
Kim, C.J. (Korea Atomic Energy Research Institute)
Publication Information
Progress in Superconductivity and Cryogenics / v.19, no.1, 2017 , pp. 36-41 More about this Journal
Abstract
The effects of $MgB_4$ addition on the superconducting properties and the microstructure of in situ processed $MgB_2$ bulk superconductors were studied. $MgB_4$ powder of 1-20 wt.% was mixed with (Mg + 2B) powder and then pressed into pellets. The pellets of (Mg + 2B + $xMgB_4$) were heat-treated at $650^{\circ}C$ for 1 h in flowing argon. The powder X-ray diffraction (XRD) analysis for the heat-treated samples showed that the major formed phase in all samples was $MgB_2$ and the minor phases were $MgB_4$ and MgO. The full width at half maximum (FWHM) values showed that the grain size of $MgB_2$ decreased as the amount of $MgB_4$ addition increased. $MgB_4$ particles included in a $MgB_2$ matrix is considered to suppress the grain growth of $MgB_2$. The onset temperatures ($T_{c,onset}$) of $MgB_2$ with $MgB_4$ addition (0-10 wt.%) was between 37-38 K. The 20 wt.% $MgB_4$ addition slightly reduced the $T_{c,onset}$ of $MgB_2$ to 36.5 K. This result indicates that $MgB_4$ addition did not influence the superconducting transition temperature ($T_c$) of $MgB_2$ significantly. On the other hand, the small additions of 1-5 wt.% $MgB_4$ increased the critical current density ($J_c$) of $MgB_2$. The $J_c$ enhancement by $MgB_4$ addition is attributed not only to the grain size refinement but also to the possible flux pinning of $MgB_4$ particles dispersed in a $MgB_2$ matrix.
Keywords
$MgB_2$; $MgB_4$ addition; Superconductor; Critical current density ($J_c$); Grain refinement;
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