Determination of Atomic Scale Structure Property Relationships in High-Temperature Superconductors for Power Transmission Applications

电力传输应用高温超导体原子尺度结构特性关系的确定

• 批准号: 9803021
• 负责人: Nigel Browning
• 金额: $ 29.1万
• 依托单位: University of Illinois at Chicago
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-06-01 至 2001-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9803021&HistoricalAwards=false
• 关键词: Determination; Atomic; Scale; Structure; Property

9803021 Browning This project will study the structure/property relationships in order to determine the optimum microstructure for the incorporation of high-TC superconductors into viable devices. The electronic conduction of these materials is extremely sensitive to atomic-scale defects that are introduced during the processing of the oxide material. The relationship between the atomic-scale defects and the electronic conduction can be determined by atomic resolution Z-contrast imaging and electron energy loss spectroscopy in the scanning transmission electron microscope (STEM). These techniques can be performed simultaneously in the STEM, with the image being used to determine the atomic structure and the spectrum being used to determine the electronic structure. Features of the spectrum can be correlated with the charge carrier concentration, allowing weak-links to be quantified on a scale below the coherence length. The atomic resolution analysis techniques will be applied to two systems that are currently being developed for power transmission and high-magnetic field applications. In collaboration with American Superconductor Corporation, a major thrust of the proposal is to investigate the properties of defects in Bi2Sr2Ca2Cu308 (2223) tapes and relate them to processing conditions. Building on an established successful collaborative program, this project will investigate the distribution of defects within the tapes and the relationship between the formation of the 2223 phase and the tape microstructure. The second goal of this proposal is to investigate the properties of YBa2Cu307 films produced on textured metal substrates. Although further from a viable product, this recently developed fabrication procedure offers a possible alternative to the 2223 tapes. Research will focus on a comparison of properties with the results from individual grain boundaries and single crystals, with the aim of determining the route to large-scale fabrication of t hese materials. %%% Since the discovery of high-TC superconductivity in the ceramic oxides, these materials have held the promise of efficient, powerful and sensitive electronic devices and power transmission wires. The results of this research will help determine the processing route to produce improved tapes suitable for commercial applications. The research will have a significant impact on the applications of high-TC superconductors. ***

9803021布朗宁 该项目将研究结构/性能关系，以确定将高TC超导体纳入可行设备的最佳微观结构。 这些材料的电子传导对在氧化物材料的处理期间引入的原子级缺陷极其敏感。 原子尺度缺陷与电子导电之间的关系可以通过扫描透射电子显微镜（STEM）中的原子分辨率Z衬度成像和电子能量损失谱来确定。 这些技术可以在STEM中同时进行，图像用于确定原子结构，光谱用于确定电子结构。 光谱的特征可以与电荷载流子浓度相关，允许在低于相干长度的尺度上量化弱链接。 原子分辨率分析技术将应用于目前正在开发的电力传输和高磁场应用的两个系统。 与美国超导公司合作，该提案的主要目的是研究Bi 2Sr 2Ca 2Cu 3 O 8（2223）带材中缺陷的性质，并将其与加工条件联系起来。 在一个成功的合作项目的基础上，该项目将研究带材中缺陷的分布以及2223相的形成与带材微观结构之间的关系。 本提案的第二个目标是研究在织构化金属衬底上制备的YBa_2Cu_3O_7薄膜的性质。 虽然离可行的产品还有一段距离，但这种最近开发的制造工艺为2223胶带提供了一种可能的替代品。 研究将侧重于将性能与单个晶界和单晶的结果进行比较，目的是确定这些材料的大规模制造路线。 自从在陶瓷氧化物中发现高TC超导性以来，这些材料已经成为高效，强大和敏感的电子设备和电力传输线的希望。 这项研究的结果将有助于确定生产适合商业应用的改进胶带的工艺路线。该研究对高温超导体的应用具有重要意义。 ***