Growth Mechanism of Hg-Based Superconducting Cuprate Thin Films

Hg基超导铜酸盐薄膜的生长机理

• 批准号: 9632279
• 负责人: Judy Wu
• 金额: $ 25.4万
• 依托单位: University of Kansas Main Campus
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-08-01 至 1999-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9632279&HistoricalAwards=false
• 关键词: Growth; Mechanism; Hg; Based; Superconducting

9632279 Wu This research project addresses film growth mechanisms in fast temperature ramping Hg-vapor annealing(FTRA) of Hg-based cuprate(HgBaCaCuO) superconductor films. The film growth mechanism in the FTRA process will be studied by correlating processing parameters to the sample physical properties including phase purity, film/substrate interface structure and surface morphology, Tc, Jc, and other superconducting characteristics. Expectations are that the FTRA technique can minimize problems caused by the high volatility of the Hg-compounds involved, formation of CaHgO2, and chemical reactions at the film/substrate interface. Chemical-doping-assisted growth of Hg-based cuprate films using Na, Tl, or Re as the dopant will also be investigated to achieve high-purity epitaxial Hg-1223 thin films. Rare-earth garnets and LaAlO3 will be used as substrates in the fabrication of large-area Hg-based cuprate wafers. %%% The project is multidisciplinary combining fundamental materials chemistry/physics and materials processing studies with advanced characterization tools and analysis methods to address forefront issues in a topical area of high scientific value and potential technological benefits. The research will contribute basic materials science knowledge at a fundamental level to several aspects of advanced microwave and microelectronic devices. The knowledge and understanding gained from this research project is expected to contribute in a general way to improving the performance of advanced devices by providing a fundamental understanding and a basis for designing and producing improved materials, and materials processing routes. An important feature of the program is the integration of research and education through the training of students in a fundamentally and technologically significant area. ***

9632279 Wu本研究项目旨在研究Hg基铜酸盐（HgBaCaCuO）超导薄膜在快速升温Hg蒸气退火（FTRA）中的薄膜生长机制。 FTRA过程中的薄膜生长机制将通过将处理参数与样品的物理性质（包括相纯度、薄膜/衬底界面结构和表面形态、Tc、Jc和其他超导特性）相关联来研究。 期望的是，FTRA技术可以最大限度地减少由所涉及的汞化合物的高挥发性，CaHgO 2的形成，以及在膜/基板界面处的化学反应引起的问题。 化学掺杂辅助生长的Hg基铜酸盐薄膜使用Na，Tl，或Re作为掺杂剂也将被研究，以实现高纯度的外延Hg-1223薄膜。稀土石榴石和LaAlO 3将被用作大面积Hg基铜酸盐晶片的制造中的衬底。该项目是多学科的，将基础材料化学/物理和材料加工研究与先进的表征工具和分析方法相结合，以解决具有高科学价值和潜在技术效益的热门领域的前沿问题。 该研究将为先进微波和微电子器件的几个方面提供基础材料科学知识。 从该研究项目中获得的知识和理解预计将通过提供基本理解和设计和生产改进材料以及材料加工路线的基础，为提高先进设备的性能做出贡献。 该计划的一个重要特点是通过在一个基本和技术上重要的领域对学生进行培训来整合研究和教育。***