Investigation of Jc-Suppressing Factors in Flat-Rolled Sr0.6K0.4Fe2As2/Fe Tapes Via Microstructure Analysis

被引：5

作者：

Zhang, Xianping ^{[1
]}

Wang, Qingxiao ^{[2
]}

Li, Kun ^{[2
]}

Cai, Yao ^{[3
]}

Jiang, Fuguo ^{[3
]}

Wang, Zhen ^{[3
]}

Li, Jianqi ^{[3
]}

Yao, Chao ^{[1
]}

Lin, He ^{[1
]}

Zhang, Qianjun ^{[1
]}

Dong, Chiheng ^{[1
]}

Wang, Dongliang ^{[1
]}

Zhang, Xixiang ^{[2
]}

Ma, Yanwei ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Elect Engn, Beijing 100190, Peoples R China

[2] King Abdullah Univ Sci & Technol, Div Phys Sci & Engn, Thuwal 239556900, Saudi Arabia

[3] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 2015年 / 25卷 / 03期

基金：

中国国家自然科学基金;

关键词：

J(c); microstructure; pnictide superconductors; wires; SUPERCONDUCTING PROPERTIES;

D O I：

10.1109/TASC.2014.2360647

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Pnictide superconductors will be very promising for applications if wires with high critical current density J(c) 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 J(c) as high as 2.3 x 10(4) A/cm(2) at 10 T and 4.2 K. The overlapping nature of the Sr122 plates was clearly observed. Transmission electron microscopy/scanning transmission electronmicroscopy 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 J(c). 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.

引用

页数：5

共 21 条

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Xu, Ruicheng
Zhang, Shilong
Wang, Fengqi
Zhang, Qianwei
Li, Zhengdong
Wang, Zhenhua
Gao, Rongli
Cai, Wei
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JOURNAL OF ELECTRONIC MATERIALS, 2019, 48 (01) : 386 - 400

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