Microstructure and Superconducting Properties of Bulk Hg-Ba-Ca-Cu-O on Metallic Surfaces

本研究综合了材料的合成、微观结构表征和超导性能表征，探讨了金属界面对HgBa2Can-1CunOx体系的关键影响，这是迄今为止达到的最高临界温度的超导氧化物体系。项目目标包括确定化学相容的金属衬底，了解和控制界面反应，了解超导和竞争的非超导相（包括织构）的微观结构发展的影响因素，以及了解微观结构/超导性质的关系，包括通量钉钉和薄弱环节。合成研究将采用两区组装，允许独立控制汞压力和退火温度。胶带将被铸造在金属基板上。热加工、大气、化学计量和基体金属是重要的变量。样品将使用各种技术进行表征。该项目解决了HgBa2Can-1 CunOx超导氧化物应用的潜在科学问题。对高温超导体的金属界面、微观结构和性能之间的关系将有更深入的了解。＊＊＊

9526231 Schwartz The proposed research integrates synthesis, microstructural characterization, and superconducting properties characterization to explore the critical influence of a metallic interface on the HgBa2Can-1CunOx system, the superconducting oxide system with highest critical temperature yet achieved. The project objectives include identifying chemically compatible metallic substrates, understanding and controlling interfacial reactions, understanding the influencing factors for microstructural development of the superconducting and competing non- superconducting phases (including texture), and understanding the microstructure/superconducting properties relationships, including flux pinning and weak links. Synthesis studies will employ a two-zone assembly that allows for independent control of the mercury pressure and the annealing temperature. Tapes will be cast on metallic substrates. Thermal processing, atmosphere, stoichiometry, and substrate metal are important variables. The samples will be characterized using a variety of techniques. %%% The project addresses the underlying scientific issues for applications of the HgBa2Can-1 CunOx superconducting oxides. A deeper understanding of the relationships between metallic interfaces, microstructure, and properties of high temperature superconductors will result. ***