Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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The Influence of Fe Particle Size on the Critical Properties of MgB2 Superconductor

MgB2 초전도체의 임계특성에 대한 Fe 입자 크기의 영향

  • Jeong, Hyeondeok (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Lee, Dong-Gun (Sam Dong Co., Ltd., R&D Center) ;
  • Ryu, Sung-Soo (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Park, Hai-Woong (Department of Materials Engineering, Korea University of Technology Education) ;
  • Kim, Chan-Joong (Neutron and Radioisotope Application Research Division, Korea Atomic Energy Research Institute) ;
  • Jun, Byung-Hyuk (Neutron and Radioisotope Application Research Division, Korea Atomic Energy Research Institute)
  • 정현덕 (한국세라믹기술원 엔지니어링세라믹센터) ;
  • 이동건 ((주)삼동 기술연구소) ;
  • 류성수 (한국세라믹기술원 엔지니어링세라믹센터) ;
  • 박해웅 (한국기술교육대학교 신소재공학과) ;
  • 김찬중 (한국원자력연구원 중성자동위원소응용연구부) ;
  • 전병혁 (한국원자력연구원 중성자동위원소응용연구부)
  • Received : 2019.10.14
  • Accepted : 2019.10.25
  • Published : 2019.10.28
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Abstract

This study demonstrates the effect of addition of Fe particles of different sizes on the critical properties of the superconductor $MgB_2$. Bulk $MgB_2$ is synthesized by ball milling Mg and B powders with Fe particles at $900^{\circ}C$. When Fe particles with size less than $10{\mu}m$ are added in $MgB_2$, they easily react with B and form the FeB phase, resulting in a reduction in the amount of the $MgB_2$ phase and deterioration of the crystallinity. Accordingly, both the critical temperature and the critical current density are significantly reduced. On the other hand, when larger Fe particles are added, the $Fe_2B$ phase forms instead of FeB due to the lower reactivity of Fe toward B. Accordingly, negligible loss of B occurs, and the critical properties are found to be similar to those of the intact $MgB_2$.

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