Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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A safe and cost-effective PMMA carbon source for MgB2

  • Ranot, Mahipal (Materials Deformation Department, Korea Institute of Materials Science) ;
  • Jang, S.H. (Kiswire Advanced Technology Ltd) ;
  • Shinde, K.P. (Functional Nano Powder Materials Department, Korea Institute of Materials Science) ;
  • Sinha, B.B. (National Centre for Nanoscience and Nanotechnology, University of Mumbai) ;
  • Bhardwaj, A. (Department of Physics, Sungkyunkwan University) ;
  • Oh, Y.S. (Materials Deformation Department, Korea Institute of Materials Science) ;
  • Kang, S.H. (Materials Deformation Department, Korea Institute of Materials Science) ;
  • Chung, K.C. (Functional Nano Powder Materials Department, Korea Institute of Materials Science)
  • Received : 2017.02.13
  • Accepted : 2017.03.08
  • Published : 2017.03.31
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Abstract

Carbon is proven to be very effective in pinning the magnetic vortices and improving the superconducting performance of $MgB_2$ at high fields. In this work, we have used polymethyl methacrylate (PMMA) polymer as a safe and cost effective carbon source. The effects of molecular weight of PMMA on crystal structure, microstructure as well as on superconducting properties of $MgB_2$ were studied. 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 different molecular weights of PMMA. This indicates that carbon could be substituted in the boron honeycomb layers without affecting the interlayer interactions. As compared to undoped $MgB_2$, substantial enhancement in $J_c(H)$ properties was obtained for PMMA-doped $MgB_2$ samples both at 5 K and 20 K. The enhancement could be attributed to the effective carbon substitution for boron and the refinement of crystallite size by PMMA doping.

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References

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