Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Superconducting Properties and Phase Formation of MgB2 Superconductors Prepared by the Solid State Reaction Method using MgB4 and Mg Powder

MgB4와 Mg 분말을 원료로 사용하여 고상반응법으로 제조한 MgB2 초전도체의 상생성과 초전도 특성

  • Jeong, Hyeondeok (Department of Materials Engineering, Korea University of Technology Education) ;
  • Kim, Chan-Joong (Neutron Utilization Technology Division, Korea Atomic Energy Research Institute) ;
  • Jun, Byung-Hyuk (Neutron Utilization Technology Division, Korea Atomic Energy Research Institute) ;
  • Kim, Seolhyang (Neutron Utilization Technology Division, Korea Atomic Energy Research Institute) ;
  • Park, Hai-Woong (Department of Materials Engineering, Korea University of Technology Education)
  • 정현덕 (한국기술교육대학교 신소재공학과) ;
  • 김찬중 (한국원자력연구원 중성자응용기술부) ;
  • 전병혁 (한국원자력연구원 중성자응용기술부) ;
  • 김설향 (한국원자력연구원 중성자응용기술부) ;
  • 박해웅 (한국기술교육대학교 신소재공학과)
  • Received : 2015.06.29
  • Accepted : 2015.10.16
  • Published : 2015.10.28
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Abstract

$MgB_2$ bulk superconductors are synthesized by the solid state reaction of ($MgB_4$+xMg) precursors with excessive Mg compositions (x=1.0, 1.4, 2.0 and 2.4). The $MgB_4$ precursors are synthesized using (Mg+B) powders. The secondary phases ($MgB_4$ and MgO) present in the synthesized $MgB_4$ are removed by $HNO_3$ leaching. It is found that the formation reaction of $MgB_2$ is accelerated when Mg excessive compositions are used. The magnetization curves of $Mg_1+_xB_2$ samples show that the transition from the normal state to the superconducting state of the Mg excessive samples with x=0.5 and x=0.7 are sharper than that of $MgB_2$. The highest $J_c-B$ curve at 5 K and 20 K is achieved for x=0.5. Further addition of Mg decreases the $J_c$ owing to the formation of more pores in the $MgB_2$ matrix and smaller volume fraction of $MgB_2$.

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