Comparisons of the microstructure and superconducting properties in Y–Ba–Cu–O single-grain superconductors grown with different liquid sources: The influence of element doping through liquid infiltration
Comparisons of the microstructure and superconducting properties in Y–Ba–Cu–O single-grain superconductors grown with different liquid sources: The influence of element doping through liquid infiltration
复制标题
DOI：
10.1016/j.ceramint.2015.09.020
复制
发表时间：
2016
影响因子：
5.2
通讯作者：
Guo-Zheng Li;Lei Dong;Xiangyun Deng
中科院分区：
文献类型：
--
作者：
Guo-Zheng Li;Lei Dong;Xiangyun Deng
基于顶部种子渗透生长（TSIG）技术，利用两种不同的液体源：Y2O3+10BaO+16CuO和Yb2O3+10BaO+16CuO，成功生长了两个Y-Ba-Cu-O（YBCO）单晶样品，分别标记为Y-LS和Yb-LS，并对其微观结构和超导性能进行了系统比较。显微结构观察表明，Yb-LS 样品中同时存在微米级 Y2BaCuO5(Y-211) 颗粒和尺寸比 Y-LS 样品更小的纳米级 Y-211 夹杂物，能量色散光谱 (EDS) 结果证实 Yb-LS 处理样品中存在浓度高达 0.46 wt% 的 Yb 元素。超导性能测量表明，与 Y-LS 样品中的结果（28.54 N 和 90.8 K）相比，Yb-LS 样品中观察到略高的悬浮力（29.09 N）和略低的 Tc（90.3 K）。而对于Jc性能，在Yb-LS样品中观察到较高的零场Jco为8.41×104A/cm2，并且在1.4T的较高场下观察到明显的峰值效应4.33×104A/cm2，这表明存在来自较小的Y-211颗粒/夹杂物的更强的δl型钉扎，以及来自基体成分的空间波动的更强的δTc型钉扎。结果证明了扩散的Yb元素对YBCO体超导体的积极影响，并验证了通过液体渗透的元素扩散掺杂途径。
Based on the top-seed infiltration and growth (TSIG) technique, two Y–Ba–Cu–O (YBCO) single-grain samples were successfully grown with two different kinds of liquid sources: Y2O3+10BaO+16CuO and Yb2O3+10BaO+16CuO, labeled as Y-LS and Yb-LS respectively, and systematical comparisons of their microstructure and superconducting properties were carried out. Microstructural observations indicate that the Yb-LS sample exhibits both the micro-sized Y2BaCuO5(Y-211) particles and the nano-sized Y-211 inclusions with smaller sizes than the Y-LS sample, and the energy dispersive spectrometry (EDS) result confirms the existence of Yb element with a concentration up to 0.46 wt% in Yb-LS processed sample. Measurements of superconducting properties showed that, a slightly higher levitation force (29.09 N) and a slightly reducedTc(90.3 K) were observed in the Yb-LS sample, compared with the result (28.54 N and 90.8 K) in Y-LS sample. While forJcproperty, both a higher zero-fieldJcof 8.41×104A/cm2and an obvious peak effect of 4.33×104A/cm2at a higher field of 1.4 T were observed in the Yb-LS sample, indicating the existence of strongerδl-type pinning from smaller Y-211 particles/inclusions, as well as strongerδTc-type pinning from the spatial fluctuations in matrix composition. The results prove the positive impact of the diffused Yb element on YBCO bulk superconductor and validate the element diffusion-doping route through the liquid infiltration.