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首页> 外文会议>Proceedings vol.2003-29; Epitaxial Growth of Functional Oxides Symposium and Electrochemical Society Meeting; 20031012-17; Orlando,FL(US) >MICROSTRUCTURAL DEVELOPMENT IN YBA_2CU_3O_7 COATED CONDUCTORS BASED ON EX-SITU YBCO CONVERSION PROCESSES
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MICROSTRUCTURAL DEVELOPMENT IN YBA_2CU_3O_7 COATED CONDUCTORS BASED ON EX-SITU YBCO CONVERSION PROCESSES

机译：基于异位YBCO转化过程的YBA_2CU_3O_7涂层导体的微观结构发展

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摘要

Ex-situ conversion of YBa_2Cu_3O_y precursors is an economically attractive process for adding the superconducting layer to a coated conductor substrate. Understanding the phase conversion process and final microstructural assemblage is crucial to maximizing the superconducting properties. Each process used to build a YBa_2Cu_3O_y (YBCO) coated conductor creates an interface along which defects or interfacial reactions may result. These defects can be additive and propagate through the entire film structure to affect the growth and properties of the superconducting film. The effects of substrate features, buffer layers, and conversion processes of the ex-situ Y-123 films on the resulting microstructures are discussed. Interfacial reactions between the substrate, buffer layers, and Y-123 films are examined. Y-123 films produced from BaF_2-based precursors deposited by e-beam evaporation or metal organic deposition of trifluroacetate-based precursors are compared in terms of their final microstructures, phase assemblage, and superconducting properties. The initial stages of processing during which phase segregation can occur, Y-123 and secondary phase development, and the degree of conversion completion in fully processed coated conductors are also examined. Implications for thick film (t > 1 μm) development and structural refinements are discussed.
机译：YBa_2Cu_3O_y前体的非原位转化是将超导层添加到涂覆的导体基材上的经济上有吸引力的方法。了解相变过程和最终的微结构组装对于最大化超导性能至关重要。用于构建YBa_2Cu_3O_y（YBCO）涂层导体的每个过程都会创建一个界面，沿着该界面可能会导致缺陷或界面反应。这些缺陷可能是累加的，并在整个膜结构中传播，从而影响超导膜的生长和性能。讨论了衬底特征，缓冲层和异位Y-123膜的转化过程对所得微结构的影响。检查基材，缓冲层和Y-123膜之间的界面反应。比较了通过电子束蒸发或基于三氟乙酸盐基前体的金属有机沉积而沉积的基于BaF_2基前体的Y-123膜的最终微观结构，相组装和超导性能。还检查了可能发生相分离的处理的初始阶段，Y-123和次级相的发展，以及在完全处理过的涂层导体中转化完成的程度。讨论了厚膜（t> 1μm）显影和结构改进的意义。

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