Abstract
The intrinsic effects of nanoscopic MnO 2 powders addition combined with Fe cation substitutions for copper sites on the microstructure and superconductive properties of YBa 2Cu 3O 7− δ (Y123) melt-solidified bulks have been investigated. On the one hand, an increase in Y 2BaCuO 5 (Y211) particle pushing, leading to an inhomogeneous bulk microstructure, is caused by increasing MnO 2 content due to increased net interfacial energy, Δ σ 0; and, on the other hand, an addition of MnO 2 powders is effective in enhancing both the δT c- type and δl-type pinning. It also shows that the Fe addition helps to optimize the high magnetic field performance and Y211 particle distribution in textured pellets. Further, this experiment suggests that a combination of the element substitution and the nanoscopic particle is a beneficial way to optimize the microstructure and superconductive properties of single-domain bulk superconductors.
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