Investigation of Jc-Suppressing Factors in Flat-Rolled Sr0.6K0.4Fe2As2Fe Tapes Via Microstructure Analysis
Type
ArticleAuthors
Zhang, XianpingWang, Qingxiao
Li, Kun
Cai, Yao
Jiang, Fuguo
Wang, Zhen
Li, Jianqi
Yao, Chao
Lin, He
Zhang, Qianjun
Dong, Chiheng
Wang, Dongliang
Zhang, Xixiang

Ma, Yanwei
KAUST Department
Electron MicroscopyImaging and Characterization Core Lab
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Date
2014-09-29Online Publication Date
2014-09-29Print Publication Date
2015-06Permanent link to this record
http://hdl.handle.net/10754/556676
Metadata
Show full item recordAbstract
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 Superconductivityae974a485f413a2113503eed53cd6c53
10.1109/TASC.2014.2360647