TY - JOUR
T1 - Investigation of Jc-Suppressing Factors in Flat-Rolled Sr0.6K0.4Fe2As2Fe Tapes Via Microstructure Analysis
AU - Zhang, Xianping
AU - Wang, Qingxiao
AU - Li, Kun
AU - Cai, Yao
AU - Jiang, Fuguo
AU - Wang, Zhen
AU - Li, Jianqi
AU - Yao, Chao
AU - Lin, He
AU - Zhang, Qianjun
AU - Dong, Chiheng
AU - Wang, Dongliang
AU - Zhang, Xixiang
AU - Ma, Yanwei
N1 - KAUST Repository Item: Exported on 2020-10-01
PY - 2014/9/29
Y1 - 2014/9/29
N2 - 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.
AB - 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.
UR - http://hdl.handle.net/10754/556676
UR - http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=6912938
UR - http://www.scopus.com/inward/record.url?scp=84921341737&partnerID=8YFLogxK
U2 - 10.1109/TASC.2014.2360647
DO - 10.1109/TASC.2014.2360647
M3 - Article
SN - 1051-8223
VL - 25
SP - 1
EP - 5
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 3
ER -