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    Investigation of Jc-Suppressing Factors in Flat-Rolled Sr0.6K0.4Fe2As2Fe Tapes Via Microstructure Analysis

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    2MOr2C-01 final.pdf
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    Type
    Article
    Authors
    Zhang, Xianping
    Wang, Qingxiao
    Li, Kun
    Cai, Yao
    Jiang, Fuguo
    Wang, Zhen
    Li, Jianqi
    Yao, Chao
    Lin, He
    Zhang, Qianjun
    Dong, Chiheng
    Wang, Dongliang
    Zhang, Xixiang cc
    Ma, Yanwei
    KAUST Department
    Electron Microscopy
    Imaging and Characterization Core Lab
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2014-09-29
    Online Publication Date
    2014-09-29
    Print Publication Date
    2015-06
    Permanent link to this record
    http://hdl.handle.net/10754/556676
    
    Metadata
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    Abstract
    Pnictide superconductors will be very promising for applications if wires with high critical current density Jc can allow reel-to-reel large-scale fabrication at low costs. To understand the mechanism(s) that limited Jc in flat-rolled Sr0.6K0.4Fe2As2(Sr122) tapes, microstructure analysis has been considered the most direct and efficient way. Here, we report on high-resolution microstructure imaging and analysis on Fe-sheathed flat-rolled Sr122 tapes, which have a Jc as high as 2.3 × 104 A/cm2 at 10 T and 4.2 K. The overlapping nature of the Sr122 plates was clearly observed. Transmission electron microscopy/scanning transmission electron microscopy analysis showed that, besides the cracks formed during the fabrication process, the SrO2 phase and cavities caused by the inhomogeneously dispersed Sr and K are the other important factors suppressing Jc. The wetting phase FeAs at the grain boundaries can be partially substituted by Sn in Sn-added samples. Our findings provide insights that pave the way to further enhance the critical current of the rolled 122 tapes up to the practical level.
    Citation
    Investigation of Jc-Suppressing Factors in Flat-Rolled Sr0.6K0.4Fe2As2Fe Tapes Via Microstructure Analysis 2015, 25 (3):1 IEEE Transactions on Applied Superconductivity
    Publisher
    Institute of Electrical and Electronics Engineers (IEEE)
    Journal
    IEEE Transactions on Applied Superconductivity
    DOI
    10.1109/TASC.2014.2360647
    Additional Links
    http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=6912938
    ae974a485f413a2113503eed53cd6c53
    10.1109/TASC.2014.2360647
    Scopus Count
    Collections
    Articles; Imaging and Characterization Core Lab; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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