Progress in Superconductivity

The Korean Superconductivity Society (한국초전도학회)
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Characterization of the High Energy Milled Boron Precursor Powders in the Synthesis of $MgB_2$ Superconductor

$MgB_2$ 초전도체의 합성에 미치는 고에너지 밀링에 의한 초기 보론 분말의 특성

  • Lee, J.H. (Materials Engineering Department, Korea University of Technology and Education) ;
  • Shin, S.Y. (Materials Engineering Department, Korea University of Technology and Education) ;
  • Kim, C.J. (Nuclear Nanomaterials Development Laboratory, Korea Atomic Energy Research Institute) ;
  • Park, H.W. (Materials Engineering Department, Korea University of Technology and Education)
  • 이지현 (한국기술교육대학교 신소재공학과) ;
  • 신승용 (한국기술교육대학교 신소재공학과) ;
  • 김찬중 (한국원자력연구원 나노소재응용랩) ;
  • 박해웅 (한국기술교육대학교 신소재공학과)
  • Published : 2007.10.31
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Abstract

We characterized the highly refined boron precursor powders which were attrition milled for different milling times. $MgB_2$ powder precursor was formed from elemental crystalline Mg and amorphous B powder. The microstructure was investigated by SEM. SEM results indicate that the size of the milled powders was reduced with increasing milling time, which were varied from 0 to 8 hours. We also studied thermal behavior of the starting precursor by DSC as a function of milling time. The thermal behavior of the powder precursors was influenced by milling time. In order to determine the thermal events at DSC peaks, we annealed the milled powder mixture at $600^{\circ}C$ and $650^{\circ}C$ under protective gas and then analyzed the formation of $MgB_2$ by the XRD. We observed that superconducting $MgB_2$ phase was formed at lower temperature by the longer high energy milling. These results show that the high energy milling of the boron precursor powder can improve the reactivity for the formation of $MgB_2$.

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