Enhanced Flux Pinning and Microstructural Study of Single-Domain Gd-Ba-Cu-O Bulk Superconductors With the Addition of Fe-Containing Alloy Particles
Enhanced Flux Pinning and Microstructural Study of Single-Domain Gd-Ba-Cu-O Bulk Superconductors With the Addition of Fe-Containing Alloy Particles
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DOI：
10.1109/tmag.2011.2154310
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发表时间：
2011-09
影响因子：
2.1
通讯作者：
K. Xu;K. Tsuzuki;S. Hara;D. Zhou;Y. Xu;D. Nishio–Hamane;M. Izumi
中科院分区：
文献类型：
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作者：
K. Xu;K. Tsuzuki;S. Hara;D. Zhou;Y. Xu;D. Nishio–Hamane;M. Izumi
在超导基体中引入二次相夹杂物特别是磁性颗粒是提高高温超导体性能的有效途径。系统研究了Fe-B合金添加剂对顶种熔体生长Gd-Ba-Cu-O块状超导体组织和超导性能的影响。在0-1.4 mol%的Fe-B添加量范围内，对直径为17 mm的Gd-Ba-Cu-O块体进行了熔融织构。通过扫描电镜和透射电镜观察，发现Fe-B合金添加剂分解成直径为亚微米的含铁颗粒。Gd2BaCuO5包裹体的细化和均匀分布明显改善。因此，Gd-Ba-Cu-O块体的磁通钉住能力、磁通捕获能力和临界电流密度都得到了相应的提高。这种现象可能与含铁粒子与周围组分之间的磁相互作用有关，这可能是Gd2BaCuO5成核过程改善的原因。
Introducing secondary-phase inclusions, especially magnetic particles, into the superconducting matrix is regard as an effective way to enhance the performance of high-temperature superconductors. The effect of Fe-B alloy additives on the microstructure and superconducting properties of top-seeded melt growth processed Gd-Ba-Cu-O bulk superconductors has been investigated systematically. Gd-Ba-Cu-O bulks 17 mm in diameter were melt-textured for various amounts of Fe-B additives in the range of 0-1.4 mol%. With the observations of scanning and transmission electron microscopy, the Fe-B alloy additives were found to decompose into Fe-containing particles with submicrometer in diameter. The refinement and homogeneous distribution of Gd2BaCuO5 inclusions seems to be improved remarkably. It leads to enhance flux pinning, flux trapping capability, and critical current density of Gd-Ba-Cu-O bulks, correspondingly. This phenomenon might be related to the magnetic interactions between the Fe-containing particles and the surrounding components, which may be the origin of the improvement of Gd2BaCuO5 nucleation process.