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本文采用两种熔渗生长工艺(011-IG和211-IG)制备纳米CeO2掺杂的YBCO超导块材,同时使用一种坑式籽晶模式来阻止薄膜籽晶在热处理过程中的移动,随后对样品的生长形貌、微观结构和超导性能进行了研究.结果表明,在低掺杂量(1wt.%)下,YBCO晶体的正常生长不会受到影响,用两种工艺均能成功制备生长完全的单畴YBCO超导块材,且籽晶的位置没有发生任何移动,证明了新籽晶模式的有效性.扫描电子显微镜(SEM)结果表明,纳米CeO2掺杂可以有效细化超导块材内Y2BaCuO5(Y-211)微米级粒子的尺寸,且该方法对两种工艺均有效.低温磁性测试结果表明,011-IG法制备的纳米CeO2掺杂的样品在低外场下呈现出比未掺杂样品明显优越的Jc性能,说明细化的Y-211粒子可以有效地提高δl型钉扎.此外,相比211-IG法制备的样品,011-IG法制备的样品在磁悬浮力、微观形貌和Jc性能等方面表现更优越,因此011-IG法是一种更有潜力的制备工艺.本文结果对进一步提高YBCO超导块材的性能和优化制备工艺有重要意义.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 article, nano-CeO2 doped YBCO bulk superconductors were 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)+1wt.% nano-CeO2 were employed. And a novel pit-type seeding mode was used to prevent the movement of the film seed during the heat treatment process, then the growth morphology, microstructure and superconducting properties of the samples were investigated. The results show that, at low doping level (1wt.%), 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 have no any movement, which proves the effectiveness of the new seeding mode. The perpendicular growth sector boundaries on the top surface of the samples and clear (00l) series X-ray diffraction (XRD) peaks both prove the high c-axis orientation and high growth quality of the samples. The scanning electron microscopy (SEM) results indicate that, the nano-CeO2 doping can effectively refine the size of the Y-211 micro-particles in the bulk superconductors, and this method is valid for both the two techniques. Low-temperature magnetization measurement shows that, the nano-CeO2 doped sample prepared by the 011-IG method displays obviously superior Jc property than the undoped sample at low fields, which indicates 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 the aspects 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 for increasing the performance of the YBCO bulk superconductors as well as optimizing the fabrication technique further.
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