Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Influence of Mg Vapor Pressure on the $MgB_2$/Carbon Fiber Fabricated by Physical Vapor Deposition method

  • Li, Xiang (Engineering Research Institute, Gyeongsang National University) ;
  • Ha, Hong-Soo (Korea Electrotechnology Research Institute) ;
  • Kim, Cheol-Jin (Engineering Research Institute, Gyeongsang National University)
  • Received : 2011.10.17
  • Accepted : 2011.11.23
  • Published : 2011.11.30
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Abstract

We have fabricated the superconducting $MgB_2$/carbon fiber by physical vapor deposition method. Mg (Magnesium) and B (Boron) were simultaneously deposited on the carbon fiber using the RF-sputtering and thermal evaporation, respectively. To ensure the relatively high vapor pressure of Mg at the growth region and the subsequent phase stability of $MgB_2$ at the deposition temperature, inverted funnel-like guide made of Mg-foil was employed while one side of the guide were open for the sputtered B flux. Mg vapor pressure should be controlled precisely to secure the complete reaction. The $MgB_2$/carbon fiber showed a uniformly deposited thin layer with dense and well-formed grains. The $MgB_2$/carbon fibers in this study showed $T_c$~37.5K, $J_c$ ~ $2{\times}10^4\;A/cm^2$ in the 20K, 0T.

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References

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