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

Xianping Zhang, Qingxiao Wang, Kun Li, Yao Cai, Fuguo Jiang, Zhen Wang, Jianqi Li, Chao Yao, He Lin, Qianjun Zhang, Chiheng Dong, Dongliang Wang, Xixiang Zhang, Yanwei Ma

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

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.
Original languageEnglish (US)
Pages (from-to)1-5
Number of pages5
JournalIEEE Transactions on Applied Superconductivity
Volume25
Issue number3
DOIs
StatePublished - Sep 29 2014

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