利用分析电子显微镜观察 1144 相 FBS 的氧化结构和成分特性

Z-H Sung, A Masi, JY Lee, A Duchenko, X Hu, A G Kim, G Celentano
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摘要

1144 相(Ae1A1Fe4As4)在铁(铁)基超导体(FBS)家族中显示出强大的工程制造优势,因为其均匀的晶体层状结构使其超导特性不受化学不均匀性的影响。此外,这种规则性还与晶体缺陷有关,晶体缺陷可作为有效的钉扎中心,在高磁场下可产生高临界电流。与其他 FBS 相一样,它的无损载流能力也会因晶界(GB)的干扰而明显降低。晶界氧化是实现高磁场(> 20T)磁体实际应用 FBS 的一个最重要问题。在这项研究中,我们应用分析电子显微镜,如原子分辨率扫描透射电子显微镜和原子探针断层扫描,探索了 1144 多晶样品的氧化晶界和内在晶粒结构特性。在氧化导致超导性能退化之后,我们对机械化学辅助合成样品的这些结构特性进行了评估。我们观察到,晶界污染与块状样品传输特性的下降之间存在很强的相关性,而晶体结构似乎不受氧化的影响。
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Oxidized structure and Compositional properties of 1144 phase FBS by analytical electron microscopy
The 1144 phase (Ae1A1Fe4As4) shows a strong advantage of engineering fabrication among Fe (Iron)-based superconductor (FBS) family due to the robustness of its superconducting properties with respect to chemical inhomogeneities, granted by its uniform crystalline-layered structure. This regularity is furthermore associated to crystalline defects capable of acting as efficient pinning centers, from which high critical currents can achieved at high fields. Like other FBS phases, its lossless current-carrying capability can be remarkably degraded by distractions at grain boundaries (GBs). GB oxidation is an issue of upmost importance to the realization of the practical FBS application for high field (> 20T) magnet. In this study, we explore oxidized grain boundary and intrinsic grain structural properties of 1144 polycrystalline samples by applying analytical electron microscopy such as atomic resolution scanning transmission electron microscopy and atom probe tomography. These structural properties of samples produced by a mechanochemically assisted synthesis are evaluated following the degradation of superconducting properties due to oxidation. We observe a strong correlation between the contamination at grain boundaries and the decrease of transport properties of the bulk sample, while the crystallin structure seems to be not affected by the oxidation.
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