Enhancement of Peak Effect in
– Y – Ba – Cu Bulk Materials by the Addition of Nano‐Sized O 2 Sm 3
Recently, the significant peak effect was observed in the
2 doped CeO – Y – Ba – Cu
( O YBCO) bulk materials grown using the infiltration growth ( IG) method. The peak effect was attributed to the compositional fluctuations in the matrix, ( , Y ) Sm .
However, it was found that the peak effect was strongly spatially dependent. The inductively coupled plasma mass spectrometry BCO ‐ (ICP ) results show that the concentration of Sm ranges from 5.8 × 10−2
to 7.0 × 10−3 wt% within the bulk. Notably, the peak effect is only observed in specimens where the concentration of Sm is higher than 1.5 × 10−2 wt%. The spatial distribution of MS
dissolved from the Sm seed is the result of the way in which the liquid ( SmBCO 2 and BaCuO ) flows during the melting process of the CuO IG
technique. To suppress the variation in the composition, nano‐sized 2 Sm 3 particles are added to the precursor powders in this study. Microstructural analysis demonstrates that
with the addition of nano‐sized O 2 Sm 3, the concentration of O can be enhanced to be higher than 1.5 × 10−2 wt%
within the bulk. Therefore, the peak effect can be observed throughout the bulk material. Besides, more symmetrical trapped magnetic field profiles can be obtained.
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Document Type: Research Article
Publication date: October 1, 2012