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http://dx.doi.org/10.4150/KPMI.2012.19.2.146

Effects of Nano FexC Addition on Superconducting Properties of MgB2  

Lee, Dong-Gun (Neutron Science Division, Korea Atomic Energy Research Institute)
Lee, Ji-Hyun (Neutron Science Division, Korea Atomic Energy Research Institute)
Jun, Byung-Hyuk (Neutron Science Division, Korea Atomic Energy Research Institute)
Park, Soon-Dong (Neutron Science Division, Korea Atomic Energy Research Institute)
Uhm, Young-Rang (RI Research Division, Korea Atomic Energy Research Institute)
Park, Hai-Woong (Department of Materials Engineering, Korea University of Technology Education)
Kim, Chan-Joong (Neutron Science Division, Korea Atomic Energy Research Institute)
Publication Information
Journal of Powder Materials / v.19, no.2, 2012 , pp. 146-150 More about this Journal
Abstract
The effects of nano $Fe_xC$ addition to superconducting properties of $in$ $situ$ processed $MgB_2$ superconductors was examined. 0.1 wt.% and 1 wt.% nano $Fe_xC$ powders were mixed with boron and magnesium powders by ball milling. The powder mixtures were made into pellets by uniaxial pressing. The pellets were heat-treated at $700^{\circ}C-900^{\circ}C$ in argon atmosphere for $MgB_2$ formation. It was found by powder X-ray diffraction that the raw powders were completely converted into $MgB_2$ after the heat treatment. The superconducting transition temperature ($T_c$) and critical current density ($J_c$), estimated from susceptibility-temperature and $M-H$ curves, were decreased by nano $Fe_xC$ addition. The $T_c$ and $J_c$ decrease by nano $Fe_xC$ addition are attributed to the incorporation of iron and carbon with $MgB_2$ lattices (Fe substitution for Mg and C substitution for B) due to the high reactivity of the nano $Fe_xC$ powder.
Keywords
Nano $Fe_xC$; $MgB_2$; Critical current density; Superconducting temperature;
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