YBCO thin films prepared by fluorine-free polymer-based chemical solution deposition
YBCO thin films prepared by fluorine-free polymer-based chemical solution deposition
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DOI：
10.1109/tasc.2005.847756
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发表时间：
2005-06
影响因子：
1.8
通讯作者：
C. Apetrii;H. Schlorb;M. Falter;I. Lampe;L. Schultz;B. Holzapfel
中科院分区：
文献类型：
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作者：
C. Apetrii;H. Schlorb;M. Falter;I. Lampe;L. Schultz;B. Holzapfel
我们描述了一种新的化学溶液沉积（CSD）方法，用于廉价和环保地制备YBCO涂层导体。该方法基于无氟聚合物，与TFA方法相比具有一些优势，TFA方法使用三氟乙酸前体，并在热处理过程中形成具有侵蚀性的HF。本文研究了影响聚合物法制备YBCO薄膜结构和性能的主要参数。为了制备YBCO薄膜，将化学计量量的硝酸钇、钡和铜溶解在聚丙烯酸二甲酰胺溶液中。将该金属聚合物前驱体溶液自旋涂覆在钛酸锶（STO）单晶上。在空气中干燥后，薄膜在含氧氮气氛中进行热处理。采用x射线衍射（XRD）和扫描电镜（SEM）对膜的结构进行了分析。感应测量T/下标c/和J/下标c/。初步结果表明，加热过程中的氧气量和停留时间对超导性能有很大影响。使用聚合物基前驱体外延生长的250 nm厚YBCO薄膜具有良好的超导性能，在77 K时，T/sub c/为89.9 K (/spl δ /T/sub c/=1.1 K)， J/sub c/为10/sup 6/ A/cm/sup 2/。
We describe a new chemical solution deposition (CSD) route toward inexpensive and environmentally friendly preparation of YBCO coated conductors. This route is based on a fluorine-free polymer and exhibits some advantages compared to the TFA route, where trifluoroacetate precursors are used and aggressive HF is formed during the heat treatment. In this work, the main parameters influencing the structure and properties of YBCO films prepared by means of the polymer method are investigated. For the preparation of the YBCO films, stoichiometric amounts of Y, Ba and Cu nitrates were dissolved in a solution of polyacrylic acid in dimethylformamide. This metal polymer precursor solution was spin coated onto strontium titanate (STO) single crystals. After drying in air, the films were heat treated in an oxygen containing nitrogen atmosphere. The film structure was analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). T/sub c/ and J/sub c/ were measured inductively. The preliminary results show that the amount of oxygen during heating and in the dwell time strongly influences the superconducting properties. Good superconducting properties, with T/sub c/ of 89.9 K (/spl Delta/T/sub c/=1.1 K) and J/sub c/ of 10/sup 6/ A/cm/sup 2/ at 77 K, have been obtained on epitaxially grown 250-nm-thick YBCO films using the polymer-based precursors.