Transverse distribution of critical current density in Ag-sheathed Ba1- x K x Fe2As2 tapes

被引：5

作者：

Yang, Peng ^{[1
,2
]}

Huang, He ^{[1
,2
]}

Han, Meng ^{[1
,2
]}

Guo, Wenwen ^{[1
,2
]}

Tu, Chang ^{[1
,2
]}

Wang, Dongliang ^{[1
,2
,4
]}

Zhang, Xianping ^{[1
,2
,4
]}

Ma, Yanwei ^{[1
,2
,3
,4
]}

机构：

[1] Chinese Acad Sci, Inst Elect Engn, Key Lab Appl Superconduct, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] Zhengzhou Univ, Sch Mat Sci & Engn, Zhengzhou 450001, Peoples R China

[4] Qilu Zhongke, Inst Elect Engn & Adv Electromagnet Drive Technol, Jinan 250013, Peoples R China

来源：

SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 2022年 / 35卷 / 01期

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

Ba1-x K (x) Fe2As2 tapes; microstructure; critical current density distribution; inhomogeneity; SUPERCONDUCTIVITY; (BI;

D O I：

10.1088/1361-6668/ac39ea

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The Ag-sheathed Ba1-x K (x) Fe2As2 (Ba-122) monofilamentary tapes were prepared by the ex-situ powder-in-tube method. The variation of the microstructure and superconducting properties with the thickness of the superconducting core in the cross-section of sintered tapes is studied. At the same time, the reason is studied in comparison with the unsintered tapes. The research results show that the magnetic J (c) of the iron-based superconducting tapes increases continuously with distance from the core-sheath interface, which is the complete opposite of the Bi-based superconductor. The magnetic J (c) of central layers for final Ba-122 tapes is about 33% higher than the J(c) of the whole tape at 4.2 K and 7 T. We have found that the center of the superconducting core shows higher hardness and better texture. In addition, it is also found that there is a reaction layer at the Ag-superconductor interface. These reasons may result in the reduction of the critical current density near the interface in the tapes. Moreover, we also found the presence of a reaction layer in the hot-pressed (HP) high-performance samples. However, no unevenness was found in the unsintered samples. Therefore, the superconductivity of Ba-122 tapes will be better by reducing the reaction layer and eliminating inhomogeneity at the core-sheath interface of the sintered tapes.

引用

页数：7