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- W3200730431 abstract "Abstract In iron-based superconductors, randomly oriented grain boundaries have a strong influence on the transport properties via intrinsic weak-link and flux pinning mechanisms. Herein we report the critical current density ( J c ) and the three-dimensional microstructure of polycrystalline bulk Co-doped Ba122 superconductors, with highly dense grain boundaries (grain size smaller than 50 nm), produced by high-energy milling. Three-dimensional electron microscopy revealed that the anomalous growth of secondary particles (aggregation) and the inter-aggregation structures were significantly different in the samples with finer grains, which may have extrinsically limited J c . These important microstructural features were quantified as two parameters—local thickness and total pore length—by reconstructing the three-dimensional structure of the superconducting phase using the adaptive thresholding method. The results obtained in this study suggest that understanding and controlling the microstructural formation process by sintering are instrumental for improving the J c properties of 122 polycrystalline materials consisting of ultrafine grains." @default.
- W3200730431 created "2021-09-27" @default.
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- W3200730431 date "2021-09-09" @default.
- W3200730431 modified "2023-09-25" @default.
- W3200730431 title "3D microstructure and critical current properties of ultra-fine-grain Ba(Fe,Co)2As2 bulk superconductors" @default.
- W3200730431 doi "https://doi.org/10.21203/rs.3.rs-877970/v1" @default.
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