Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Addition effects of nanoscale NiO on microstructure and superconducting properties of MgB2

  • Ranot, Mahipal (Materials Deformation Department, Korea Institute of Materials Science) ;
  • Jang, S.H. (Powder & Ceramics Division, Korea Institute of Materials Science) ;
  • Oh, Y.S. (Materials Deformation Department, Korea Institute of Materials Science) ;
  • Shinde, K.P. (Powder & Ceramics Division, Korea Institute of Materials Science) ;
  • Kang, S.H. (Materials Deformation Department, Korea Institute of Materials Science) ;
  • Chung, K.C. (Powder & Ceramics Division, Korea Institute of Materials Science)
  • Received : 2016.02.11
  • Accepted : 2016.02.26
  • Published : 2016.03.31
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Abstract

We have investigated the addition effect of NiO magnetic nanoparticles on crystal structure, microstructure as well as superconducting properties of $MgB_2$. NiO-added $MgB_2$ samples were prepared by the solid-state reaction method. The superconducting transition temperature ($T_c$) of 37.91 K was obtained for pure $MgB_2$, and $T_c$ was found to decrease systematically on increasing the addition level of NiO. X-ray diffraction (XRD) analysis revealed that no substitution of Ni for Mg in the lattice of $MgB_2$ was occurred. The microstructural analysis shows that the pure $MgB_2$ sample consists of plate shape $MgB_2$ grains, and the grains get refined to smaller size with the addition of NiO nanoparticles. At 5 K, high values of critical current density ($J_c$) were obtained for small amount NiO-added $MgB_2$ samples as compared to pure sample. The enhancement in $J_c$ could be attributed to the refinement of $MgB_2$ grains which leads to high density of grain boundaries in NiO-added $MgB_2$ samples.

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References

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