Microstructure and superconducting property research of Cu-Mg reinforcing graphene and grain refining MgB2 by carbon-contained substances doping

IF 1.3 3区物理与天体物理 Q4 PHYSICS, APPLIED

Physica C-superconductivity and Its Applications Pub Date : 2025-01-15 DOI:10.1016/j.physc.2024.1354632

Wenbin Jin , Nan Liu , Fang Cheng , Zongqing Ma , Yongchang Liu , Pingzhan Si , Hongliang Ge

引用次数: 0

Abstract

We report the C substitution effects in MgB₂ bulks on the lattice parameters, FWHM, and critical current density (J_c) as a function of doping level. It is shown that using carbon-coated boron powder can effectively control the grain growth of MgB₂ during the whole sintering process. Accompanied by the rapid cooling process, the final average grain size can be restrained within merely 50 nm, and the J_c value of the sample can be significantly improved at high field. On top of that, adding Cu is also considered a key factor in improving the current carrying property of the graphene-doped sample throughout the whole field, which can be attributed to the formation of the MgCu₂ alloy phase.

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含碳物质掺杂Cu-Mg增强石墨烯和晶粒细化MgB2的微观结构和超导性能研究

我们报告了MgB2块体中的C取代效应对晶格参数、FWHM和临界电流密度（Jc）的影响，这是掺杂水平的函数。结果表明，采用碳包覆硼粉可以有效地控制MgB2在整个烧结过程中的晶粒生长。在快速冷却过程中，样品的最终平均晶粒尺寸可以控制在50 nm以内，并且在高场下样品的Jc值可以显著提高。除此之外，Cu的加入也被认为是提高石墨烯掺杂样品整个领域的载流性能的关键因素，这可以归因于MgCu2合金相的形成。

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

Physica C-superconductivity and Its Applications 物理-物理：应用

CiteScore

2.70

自引率

11.80%

发文量

102

审稿时长

66 days

期刊介绍： Physica C (Superconductivity and its Applications) publishes peer-reviewed papers on novel developments in the field of superconductivity. Topics include discovery of new superconducting materials and elucidation of their mechanisms, physics of vortex matter, enhancement of critical properties of superconductors, identification of novel properties and processing methods that improve their performance and promote new routes to applications of superconductivity. The main goal of the journal is to publish: 1. Papers that substantially increase the understanding of the fundamental aspects and mechanisms of superconductivity and vortex matter through theoretical and experimental methods. 2. Papers that report on novel physical properties and processing of materials that substantially enhance their critical performance. 3. Papers that promote new or improved routes to applications of superconductivity and/or superconducting materials, and proof-of-concept novel proto-type superconducting devices. The editors of the journal will select papers that are well written and based on thorough research that provide truly novel insights.