蒸汽-固体反应的相位形成和运输特性 AIMI MgB2超导体
F Wan1, J Kwon2, M D Sumption2
1Applied Physics and Superconducting Technology Division, Fermi National Accelerator Laboratory, Batavia, IL, USA.
概括
蒸汽固体反应增强了二化 (MgB) 线,实现了高临界电流密度. 优化多纤维电线的热处理使得4.2K,10T的峰值性能达到峰值.
科学领域:
- 材料科学 材料科学 材料科学
- 超导电性 超导电性 超导电性
- 应用物理 应用物理
背景情况:
- 二化物 (MgB2) 是一个有前途的超导体,用于各种应用.
- 在MgB2电线中实现高临界电流密度 (Jc) 对于实际使用至关重要.
- 蒸汽固体反应方法提供了一条通往密集的MgB2形成的途径.
研究的目的:
- 为了研究蒸汽-固体反应对Al-Mg-Mn-In (AIMI) 覆盖MgB2线的超导性能的影响.
- 优化热处理条件,以提高临界电流和工程电流密度.
- 为了探索MgB2线在不同温度和磁场的性能.
主要方法:
- 单丝和6丝AIMI MgB线的蒸汽固体反应处理.
- 在625°C的温度下进行热处理,持续时间从8小时到16小时.
- 测量4.2K和10T的临界电流 (Ic) 和工程电流密度 (Je),以及10-20K的传输测量.
主要成果:
- 形成了一个高度密集的MgB2层,导致临界电流密度 (Jc) 约为10-5 A cm-2.
- 最大临界电流 (Ic) 为92.3A,工程电流密度 (Je) 为1.15 × 104 A cm-2,在4.2K,10T的温度下实现,用于在625°C下进行14小时热处理的多纤维电线.
- 运输测量表明在更高温度 (10-20 K) 中表现良好.
结论:
- 蒸汽固体反应是生产高性能MgB电线的有效方法.
- 优化热处理对于最大化超导特性至关重要.
- 进一步的导体优化有可能在多丝MgB线中实现更高的性能.
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