期刊
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
卷 34, 期 1, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1361-6668/abc2ae
关键词
Y– Ba– Cu– O; PM-IG; BiFeO3 nanoparticle; crystal growth; superconducting properties
资金
- National Natural Science Foundation of China [51872199, 51802247]
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 was investigated. The results showed that nano-BFO doping reduced the growth rate of the Y-123 crystal and led to smaller grain size in the YBCO bulk. Improved levitation force and trapped field properties were observed in the 0.2 wt% BFO-doped YBCO sample, indicating superior performance compared to other samples with different BFO amounts.
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 Delta T-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.
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