한국초전도ㆍ저온공학회논문지 (Progress in Superconductivity and Cryogenics)

  • 제19권3호
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  • Pages.40-43
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  • 2017
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  • 1229-3008(pISSN)
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  • 2287-6251(eISSN)
한국초전도저온학회 (The Korean Society of Superconductivity and Cryogenics)
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Carbon-coated boron using low-cost naphthalene for substantial enhancement of Jc in MgB2 superconductor

  • Ranot, Mahipal (Materials Deformation Department, Korea Institute of Materials Science) ;
  • Shinde, K.P. (Functional Nano Materials Department, Korea Institute of Materials Science) ;
  • Oh, Y.S. (Materials Deformation Department, Korea Institute of Materials Science) ;
  • Kang, S.H. (Materials Deformation Department, Korea Institute of Materials Science) ;
  • Jang, S.H. (Kiswire Advanced Technology Ltd.) ;
  • Hwang, D.Y. (Kiswire Advanced Technology Ltd.) ;
  • Chung, K.C. (Functional Nano Materials Department, Korea Institute of Materials Science)
  • 투고 : 2017.08.16
  • 심사 : 2017.09.12
  • 발행 : 2017.09.30
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초록

Carbon coating approach is used to prepare carbon-doped $MgB_2$ bulk samples using low-cost naphthalene ($C_{10}H_8$) as a carbon source. The coating of carbon (C) on boron (B) powders was achieved by direct pyrolysis of naphthalene at $120^{\circ}C$ and then the C-coated B powders were mixed well with appropriate amount of Mg by solid state reaction method. X-ray diffraction analysis revealed that there is a noticeable shift in (100) and (110) Bragg reflections towards higher angles, while no shift was observed in (002) reflections for $MgB_2$ doped with carbon. As compared to un-doped $MgB_2$, a systematic enhancement in $J_c(H)$ properties with increasing carbon doping level was observed for naphthalene-derived C-doped $MgB_2$ samples. The substantial enhancement in $J_c$ is most likely due to the incorporation of C into $MgB_2$ lattice and the reduction in crystallite size, as evidenced by the increase in the FWHM values for doped samples.

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참고문헌

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