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http://dx.doi.org/10.9714/psac.2009.11.2.007

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)
Publication Information
Progress in Superconductivity and Cryogenics / v.11, no.2, 2009 , pp. 7-10 More about this Journal
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.
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