The development of Y Ba2Cu3Ox thin films using a fluorine-free sol–gel approach for coated conductors
The development of Y Ba2Cu3Ox thin films using a fluorine-free sol–gel approach for coated conductors
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DOI：
10.1088/0953-2048/17/12/011
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发表时间：
2004-12
影响因子：
3.6
通讯作者：
D. Shi;Yongli Xu;H. Yao;Z. Han;J. Lan;Luming Wang;A. Li;H. Liu;S. Dou
中科院分区：
文献类型：
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作者：
D. Shi;Yongli Xu;H. Yao;Z. Han;J. Lan;Luming Wang;A. Li;H. Liu;S. Dou
尽管TFA方法在镀膜导体中沉积YBa2Cu3Ox？(YBCO)薄膜取得了巨大的成功，但去除BaCO3所涉及的关键问题还没有完全解决。可能还有其他可能的方法来处理留在电影中的碳。我们最近开发了一种无氟溶胶-凝胶合成方法，具有几个重要的优点，包括前驱体溶液的稳定性，提高了薄膜密度，以及在加工过程中消除了HF。用这种方法在单晶衬底上制备了高质量的YBCO薄膜，其输运量Jc S可达106acm2。在本研究中，改变了前驱体溶液的化学计量比并研究了其对超导性能的影响。在LaAlO_3(LaO)衬底上制备的无氟溶胶-凝胶薄膜具有良好的面内和面外织构。报道了YBCO薄膜的溶胶-凝胶法化学合成、X射线衍射和透射电子显微镜表征的实验细节。并对合成过程中YBCO相的形成机理进行了讨论。
Despite great success in the TFA methods of depositing Y Ba2Cu3Ox?(YBCO) thin films for coated conductors, critical issues involved in removing BaCO3 have not entirely been settled. There could be other possible ways of dealing with carbon that remains in the film. We have recently developed a fluorine-free sol?gel synthesis with several important advantages including precursor solution stability, improved film density, and elimination of HF during processing. With this approach, high-quality YBCO films have been developed on single crystal substrates with the transport Jc s up to 106?A?cm?2. In this study, the precursor solution stoichiometry was altered and its effects on superconducting properties were studied. The fluorine-free sol?gel-derived films on the LaAlO3?(LAO) substrate exhibited epitaxial growth with excellent in-?and out-of-plane texture. Experimental details are reported on the sol?gel synthesis chemistry and XRD and TEM characterization of the YBCO thin films. Also discussed is the underlying formation mechanism of the YBCO phase during the synthesis.