Microstructural evolution mechanism of Ba0.6KαFe2As2 Cu/Ag composite sheathed superconducting tapes

IF 5.6 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

Superconductivity Pub Date : 2025-03-01 DOI:10.1016/j.supcon.2025.100154

Wenchao Li , Chen Guo , Meng Han , Minghui Tang , Chiheng Dong , Chao Yao , Dongliang Wang , Yanwei Ma

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引用次数: 0

Abstract

Low-cost Cu/Ag composite sheathed Ba

_{0.6}

_{α}

Fe₂As₂ superconducting tapes have been the focus of considerable research interest in terms of superconducting properties and performance improvement. The K-doping content has a great influence on the transport critical current density (

J_{c}

) of Cu/Ag composite sheathed tapes. This study analyzes the evolution occurring within the micro-composition and the mechanism affecting the transport

J_{c}

in Ba

_{0.6}

_{α}

Fe₂As₂ (0.42

\leq

α

\leq

0.54) raw material, by modulating the ratio of K. It has been demonstrated that both extremes of K content, namely an insufficient or excessive amount, have an adverse effect on phase purity of the powders. Consequently, this has a direct impact on the transport

J_{c}

of tapes. Cu/Ag tapes fabricated using a precursor powder with an optimal K ratio

α \sim

0.464 exhibited the highest performance, with a

J_{c}

of 5.8 × 10⁴ A cm ⁻² at 10 T and 4.2 K. The optimized Cu/Ag composite tapes have been found to have superior advantages for high-field applications.

Abstract Image

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ba0.6 k - α fe2as2 Cu/Ag复合护套超导带微观组织演化机理

低成本Cu/Ag复合材料包覆Ba0.6KαFe2As2超导带在超导性能和性能改善方面一直是人们关注的焦点。k掺杂量对Cu/Ag复合材料护套带的输运临界电流密度（Jc）影响较大。本研究通过调节K的比例，分析了Ba0.6KαFe2As2（0.42≤α≤0.54）原料中微量成分的演变以及影响输运Jc的机制。结果表明，K含量的不足和过量这两个极端对粉末的相纯度都有不利影响。因此，这对磁带的传输Jc有直接影响。使用K比为α ~ 0.464的前驱体粉末制备的Cu/Ag带表现出最高的性能，在10 T和4.2 K下的Jc为5.8 × 104 a cm−2。优化后的Cu/Ag复合带在高场应用中具有优越的优势。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Superconductivity

CiteScore

3.90

自引率

0.00%

发文量