Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Effects of Nano FexC Addition on Superconducting Properties of MgB2

MgB2 초전도 특성에 대한 나노 FexC 첨가 효과

  • 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)
  • 이동건 (한국원자력연구원 중성자과학연구부) ;
  • 이지현 (한국원자력연구원 중성자과학연구부) ;
  • 전병혁 (한국원자력연구원 중성자과학연구부) ;
  • 박순동 (한국원자력연구원 중성자과학연구부) ;
  • 엄영랑 (한국원자력연구원 동위원소이용기술개발부) ;
  • 박해웅 (한국기술교육대학교 신소재공학과) ;
  • 김찬중 (한국원자력연구원 중성자과학연구부)
  • Received : 2012.02.26
  • Accepted : 2012.03.18
  • Published : 2012.04.28
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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.

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