Processing of Polymer-Derived High Tc Superconducting Thin Films and Coatings

该项目是关于一个新的和有前途的路线来合成薄膜和涂层的高Tc氧化物超导体，利用聚合物前驱体作为涂层介质。这是一种非常灵活的涂层工艺，最终适用于广泛的应用，包括连续的电线和带状传输介质。La2-xSrxCuO4和YBa2CU3O7-x体系的初步结果表明，通过这种技术可以获得优异的微观结构，包括完全致密、晶粒尺寸可控的薄膜。使用适当的基材，可以实现控制纹理的薄膜和涂层。该研究将表征在各种陶瓷和金属衬底上合成的YBa2CU3O7-x涂层的工艺参数、获得的微观结构和超导性能之间的相互关系。正负性质的影响将被检查。电子显微镜技术（TEM， STEM）将用于微观结构和微化学表征。对涂层进行临界温度、电流、场及其应变容限的测量。

The project is concerned with a new and promising route to the synthesis of films and coatings of high Tc oxide superconductors, which utilizes a polymer precursor as a coating medium. It is an extremely flexible coating process ultimately adaptable to a broad range of applications, including continuous wire and ribbon transport media. Initial results in the La2-xSrxCuO4 and YBa2CU3O7-x systems indicate that superior microstructures are possible by this technique including fully dense, controlled-grain size films. With proper substrates, controlled-texture films and coating may be achievable. The research will characterize the interrelationship between processing parameters, microstructure obtained, and the superconducting properties of YBa2CU3O7-x coatings synthesized on a variety of ceramic and metallic substrates. The influence of positive and negative properties will be examined. Electron microscope techniques (TEM, STEM) will be used for microstructural and microchemical characterization. Measurements of critical temperature, current, field and their strain tolerance will be conducted on the coatings.