Effect of seed orientations on the crystallization characteristics and the magnetic levitation properties of single domain YBCO bulk superconductors
Effect of seed orientations on the crystallization characteristics and the magnetic levitation properties of single domain YBCO bulk superconductors
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DOI：
10.1016/j.jallcom.2021.160788
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发表时间：
2021-06
影响因子：
6.2
通讯作者：
Tingting Wu;Haiyan Zhang;Wanmin Yang;Yan Cui;Abulizi Abulaiti
中科院分区：
文献类型：
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作者：
Tingting Wu;Haiyan Zhang;Wanmin Yang;Yan Cui;Abulizi Abulaiti
本文采用RE + 011 TSIG方法，在不同过冷温度（ΔT）下制备了两组c轴垂直于上表面（Pe-Y123）和平行于上表面（Pa-Y123）的单畴YBCO晶粒。系统地研究了ΔT对YBCO晶粒表面（Ras和Rcs）和内部（Rai和Rci）a轴和c轴生长速率的影响，并研究了单畴YBCO块材超导体的磁悬浮特性。结果表明，对于Pe-Y123组块，顶面形貌为正方形，而对于Pa-Y123组块，顶面形貌为长方形。所有的生长速率都随着ΔT的增加而近似线性增加。Rai和Rci分别大于Rai和Rci。在相同的ΔT下，Rc和Rci均大于Ra和Rai。Pe-Y123超导体具有较大的悬浮力，而Pa-Y123超导体具有相对较高的导向力。这些结果有助于理解单畴YBCO块材表面和内部的晶体生长差异，并为制备不同应用的REBCO块材提供了一条新的途径。
In this work, two groups of single domain YBCO grains with c-axis perpendicular (Pe-Y123) and parallel (Pa-Y123) to the top surface, were fabricated by the RE + 011 TSIG method under different supercooling temperature (ΔT). The effect of ΔT on the a-axis and c-axis growth rates on the surface (Rasand Rcs) and interior part (Raiand Rci) of YBCO grains were systemically investigated, and the magnetic levitation properties of single domain YBCO bulk superconductors were studied. The results indicated that the top surface morphology exhibits square shape for Pe-Y123 group bulks and rectangular shape for Pa-Y123 group bulks. All growth rates increase nearly linear with the rising ΔT. Rasand Rcsare greater than the Raiand Rci, respectively. Both Rcsand Rciare greater than Rasand Raiunder the same ΔT. Pe-Y123 superconductor is of greater levitation force, while Pa-Y123 superconductor is of relatively higher guidance force. These results are very helpful for understanding the crystal growth difference between the surface and internal of the single domain YBCO bulks, and provide a new way to fabricate REBCO bulks with designed grain orientation for different applications.