Investigation of $J_$-Suppressing Factors in Flat-Rolled $hbox_hbox_hbox_hbox_/hbox$ Tapes Via Microstructure Analysis


Pnictide superconductors can be terribly promising for applications if wires with high vital current density Jc can permit reel-to-reel giant-scale fabrication at low costs. To understand the mechanism(s) that limited Jc in flat-rolled Sr0.6K0.4Fe2As2(Sr12two) tapes, microstructure analysis has been thought of the most direct and efficient means. Here, we report on high-resolution microstructure imaging and analysis on Fe-sheathed flat-rolled Sr12two tapes, that have a Jc as high as 2.three × 104 A/cm2 at 10 T and 4.a pair of K. The overlapping nature of the Sr12a pair of plates was clearly observed. Transmission electron microscopy/scanning transmission electron microscopy analysis showed that, besides the cracks formed during the fabrication process, the SrO2 section and cavities caused by the inhomogeneously dispersed Sr and K are the opposite necessary factors suppressing Jc. The wetting phase FeAs at the grain boundaries can be partially substituted by Sn in Sn-added samples. Our findings give insights that pave the way to additional enhance the important current of the rolled 122 tapes up to the sensible level.

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