物理学报2024，Vol.73Issue(19)：233-239,7.DOI:10.7498/aps.73.20240832
纳米CeO2掺杂的YBCO超导块材的制备及其性能
Fabrication and properties of nano-CeO2 doped Y-Ba-Cu-O bulk superconductors
摘要
Abstract
Single-domain Y-Ba-Cu-O(YBCO)bulk superconductors can be widely used in the superconducting maglev,cryomagnets,motors/generators fields.In order to improve the performance of the YBCO bulk superconductors further,in this work,nano-CeO2 doped YBCO bulk superconductors are fabricated by two infiltration growth techniques(011-IG and 211-IG)respectively,in which two solid pellets of compositions Y2O3+1.15BaCuO2+0.1CuO+1wt.％nano-CeO2 and Y2BaCuO5(Y-211)+1 wt.％nano-CeO2 are employed.And a novel pit-type seeding mode is used to prevent the film seed from moving in the heat treatment process,then the growth morphologies,microstructures and superconducting properties of the samples are investigated.The results show that at a low doping level(1 wt.％),the normal growth of the YBCO crystal is not affected,and fully-grown single-domain YBCO bulk superconductors can be successfully prepared by the two techniques.Furthermore,the positions of the seeds do not move at all,which proves the effectiveness of the new seeding mode.The perpendicular growth sector boundaries on the top surfaces of the samples and clear(00l)series X-ray diffraction(XRD)peaks both prove the high c-axis orientations and high growth quality of the samples.The scanning electron microscopy(SEM)results indicate that the nano-CeO2 doping can effectively refine the sizes of the Y-211 micro-particles in the bulk superconductors,and this method is applicable to both techniques.Low-temperature magnetization measurement shows that the nano-CeO2 doped sample prepared by the 011-IG method shows obviously better Jc property than the undoped sample at low fields,indicating that the refined Y-211 particles can effectively enhance the δl-type pinning.In addition,compared with the 211-IG-processed sample,the 011-IG-processed sample performs better in terms of levitation force,microstructure and Jc property,thus the 011-IG method is a more promising preparation process.The results of this study are important in improving the performance of the YBCO bulk superconductors and optimizing the fabrication technique further.关键词
单畴Y-Ba-Cu-O/熔渗生长/纳米CeO2掺杂/超导性能Key words
single-domain Y-Ba-Cu-O/infiltration growth/nano-CeO2 doping/superconducting property引用本文复制引用
李国政,王妙..纳米CeO2掺杂的YBCO超导块材的制备及其性能[J].物理学报,2024,73(19):233-239,7.基金项目
国家自然科学基金(批准号:51872199)资助的课题. Project supported by the National Natural Science Foundation of China(Grant No.51872199). （批准号:51872199）
