The doping effect of BiFeO₃ (BFO) nanoparticles on the growth and properties of Y–Ba–Cu–O (YBCO) superconductors by the powder melt and infiltration growth technique is investigated. The results indicate that nano-BFO doping reduces the growth rate of the Y-123 crystal and finally leads to smaller grain size in the YBCO bulk. Superconducting property measurements prove that improved levitation force and trapped field properties are observed in the 0.2 wt% BFO-doped YBCO sample. Magnetization measurement shows that the YBCO samples exhibit decreased T _c values with the increased BFO amount from 0.1 wt%–0.3 wt%, but the transition width ΔT _c shows no evident change. The sample with 0.2 wt% BFO addition presents the largest zero-field J _c value and also the highest secondary peak value, which accounts for the superior performance of the sample. The electron probe micro analysis results combined with the XRD analysis prove the decomposition of the BFO and formation of the YBi-2411 in the final bulk, while Fe element exists in the form of Fe/Cu substitutions. Thus, the simultaneous introduction and cooperation of the two types of flux pinning centers (i.e. non-superconducting inclusions and element substitutions) can be realized through the addition of nano-BFO.

通过粉末熔融和渗透生长技术研究了BiFeO ₃（BFO）纳米颗粒对Y–Ba–Cu–O（YBCO）超导体的生长和性能的掺杂作用。结果表明，纳米BFO掺杂会降低Y-123晶体的生长速率，并最终导致YBCO块体中的晶粒尺寸减小。超导性能测量证明，在0.2 wt％的BFO掺杂YBCO样品中观察到了改善的悬浮力和俘获场性能。磁化测量表明，随着BFO含量从0.1 wt％–0.3 wt％的增加，YBCO样品的T _c值降低，但转变宽度ΔT _c没有明显变化。添加0.2 wt％BFO的样品呈现最大的零场J _c值以及最高的次级峰值，说明了样品的优越性能。电子探针显微分析结果与XRD分析相结合，证明了BFO的分解和YBi-2411的最终形成，而Fe元素以Fe / Cu取代的形式存在。因此，可以通过添加纳米BFO来实现两种类型的通量钉扎中心（即非超导夹杂物和元素替代）的同时引入和配合。