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Effects of $BaCO_3$ purity on the superconducting properties of top seeded melt growth processed $Y_{1+x}Ba_2Cu_3O_y$ superconductors

  • Choi, J.S. (Neutron Science Division, Korea Atomic Energy Research Institute) ;
  • Park, S.D. (Neutron Science Division, Korea Atomic Energy Research Institute) ;
  • Jun, B.H. (Neutron Science Division, Korea Atomic Energy Research Institute) ;
  • Han, Y.H. (Superconductivity and Applications Group, Korea Electric Power Research Institute) ;
  • Sung, T.H. (Superconductivity and Applications Group, Korea Electric Power Research Institute) ;
  • Choo, K.N. (Research Reactor Engineering Division, Korea Atomic Energy Research Institute) ;
  • Kim, C.J. (Neutron Science Division, Korea Atomic Energy Research Institute)
  • Published : 2009.05.31

Abstract

Effects of $BaCO_3$ purity on the superconducting properties of top seeded melt growth (TSMG) processed $Y_{1+x}Ba_2Cu_3O_{7-y}$ (Y1+x, x=0.1 and 0.2) superconductors were investigated. $YBa_2Cu_3O_{7-y}$ (Y123) powder prepared using $BaCO_3$ with 99.75% purity and commercially available Y123 powder of 99.9% were used for the fabrication of single Y123 grain superconductors. $T_c$ values of the Y1+x samples prepared using low purity Y123 powder were slightly lower than those of the samples prepared using a high purity powder. In addition to the lower $T_c$, an anomalous peak effect in the intermediate magnetic fields was observed in Y1+x samples prepared using the low purity $BaCO_3$ powder. The slight decrease in $T_c$ and the anomalous peak effect are ascribed to the possible incorporation of a Y123 phase with impurity elements such as strontium and calcium included in the $BaCO_3$powder of 99.7%. The result suggests that the low purity $BaCO_3$ powder of a low price can be used as a raw power for the fabrication of single grain YBCO bulk superconductors.

Keywords

References

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