Progress in Superconductivity

The Korean Superconductivity Society (한국초전도학회)
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Milling Effects of $Y_2BaCuO_5$ Precursor Powder with $CeO_2$ Addition on the Critical Current Density of Liquid Infiltration Growth Processed $YBa_2Cu_3O_{7-y}$ Bulk Superconductors

액상 침투 성장법으로 제조된 $YBa_2Cu_3O_{7-y}$ 벌크 초전도체의 임계전류밀도에 대한 $CeO_2$ 첨가된 $Y_2BaCuO_5$ 분말의 밀링 효과

  • Asif, Mahmood (Neutron Science Division, Korea Atomic Energy Research Institute (KAERI)) ;
  • Jun, Byung-Hyuk (Neutron Science Division, Korea Atomic Energy Research Institute (KAERI)) ;
  • Kim, Chan-Joong (University of Science and Technology (UST))
  • Received : 2010.08.04
  • Accepted : 2020.10.13
  • Published : 2010.10.31
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Abstract

The milling effects of a precursor $Y_2BaCuO_5$ (Y211) powder having 1 wt.% $CeO_2$ on the microstructure and critical current density ($J_c$) of liquid infiltration growth (LIG) processed $YBa_2Cu_3O_{7-y}$ (Y-123) bulk superconductors were investigated. The microstructure analysis revealed that the Y211 size in the final Y-123 products decreased with increasing the milling time and a relatively high density and uniform distribution of Y211 inclusions were observed in the sample prepared using 8 h milled powder. However, the unexpected Y211 particles coarsening was observed from the 4 h milled sample which was further increased for 10 h milled sample. Critical current density ($J_c$) of the LIG processed Y-123 bulk superconductors was found to be dependent on the milling time of the Y211 precursor powder. The $J_c$ increased with the increase of milling time and reached up to a maximum at 8 h in the self field while 10 h milled sample showed lower $J_c$ at the same field which might be due to the exaggerated growth and non-uniform distribution of Y211 particles.

Keywords

References

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