Progress in Superconductivity

The Korean Superconductivity Society (한국초전도학회)
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Influence of Magnesium Powder and Heat Treatment on the Superconducting Properties of $MgB_2/Fe$ Wires

$MgB_2/Fe$ 선재의 초전도성에 대한 열처리 조건과 Mg 분말의 영향

  • Tan, Tan Kai (Nuclear nano materials development laboratory, Korea Atomic Energy Research Institute (KAERI)) ;
  • Kim, N.K. (Nuclear nano materials development laboratory, Korea Atomic Energy Research Institute (KAERI)) ;
  • Kim, Y.I. (Nuclear nano materials development laboratory, Korea Atomic Energy Research Institute (KAERI)) ;
  • Jun, B.H. (Nuclear nano materials development laboratory, Korea Atomic Energy Research Institute (KAERI)) ;
  • Kim, C.J. (Nuclear nano materials development laboratory, Korea Atomic Energy Research Institute (KAERI))
  • Published : 2007.10.31
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Abstract

The most common technique to fabricate $MgB_2$ superconducting wire is by powder-in-tube (PIT) technique. Therefore, the starting powder for the processing of $MgB_2$ superconductors is an important factor influencing the superconducting properties and performance of the conductors. In this study, the influence of magnesium precursor powders and annealing temperatures on the transition temperatures ($T_c$) and critical current densities ($J_c$) of $MgB_2/Fe$ wires was investigated. All the $MgB_2/Fe$ wires were fabricated by in situ PIT process. It was found that higher $J_c$ was obtained for $MgB_2$ wires with smaller particle size of magnesium precursor powders. The $J_c$ also increases with decreasing annealing temperatures.

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