A Novel Top Seeding Method for Reliable Growth of Single-Grain YBCO Bulk Superconductor with High Levitation Property above 26 N/cm2
A Novel Top Seeding Method for Reliable Growth of Single-Grain YBCO Bulk Superconductor with High Levitation Property above 26 N/cm2
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一种可靠生长单晶 YBCO 块体超导体的新型顶部播种方法，具有高于 26 N/cm2 的高悬浮特性
DOI：
10.1021/acs.cgd.2c00767
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发表时间：
2022-08
影响因子：
3.8
通讯作者：
Miao Wang
中科院分区：
文献类型：
--
作者：
Guo-Zheng Li;Miao Wang
本文提出了一种新的顶部籽晶法，将NdBCO/YBCO/MgO薄膜籽晶置于前驱体固体芯块的顶部凹坑中，并采用011型渗透生长技术制备了单晶粒YBCO超导体。采用Y2 O3和CeO 2纳米粉体制备固体颗粒，以改善最终获得的块体材料的显微结构。结果表明，这种新的籽晶方法可以同时固定种子，并确保从底部的NdBCO层的种子的晶粒生长。反复实验证明了该方法的可靠性。扫描电子显微镜图像显示，更精细的纳米沉淀物（尺寸约100 nm）与局部高浓度存在于样品的微观结构。样品的最大悬浮力达到63.63 N，力密度计算值为26.45 N/cm 2，具有很高的悬浮性能，满足实际应用的要求。因此，本研究提供了一个可靠的制备工艺，高品质的YBCO块，是必不可少的批量生产的REBCO块体材料的大规模应用。
A novel top seeding method based on the NdBCO/YBCO/MgO film seed placed in the top pit of the precursor solid pellet was proposed herein and was used to fabricate single-grain YBCO bulk superconductors by the 011-type infiltration growth technique. Y2O3and CeO2nanopowders were used in the solid pellet to improve the microstructure in the final obtained bulk. The results indicate that this novel seeding method can be used to simultaneously fix the seed and ensure the grain growth from the bottom NdBCO layer of the seed. Repeated experiments prove the reliability of the method. Scanning electron microscopy images revealed that more refined nanoprecipitates (∼100 nm in size) with local high concentrations were present in the sample microstructure. The maximum levitation force of the sample reached 63.63 N and the force density was calculated as 26.45 N/cm2, representing a very high levitation property that meets the demands of practical applications. Consequently, this study provides a reliable preparation process for high-quality YBCO bulks that is essential for the batch-production of REBCO bulk materials for large-scale applications.
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