Stranski-Krastanov Growth in a Binary Eutectic

二元共晶中的 Stranski-Krastanov 生长

• 批准号: 0075834
• 负责人: Laurence Marks
• 金额: $ 38.01万
• 依托单位: Northwestern University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-06-01 至 2005-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0075834&HistoricalAwards=false
• 关键词: Stranski; Krastanov; Growth; Binary; Eutectic

0075834MarksIn this renewal project effort, research into the structural aspects, thermodynamics and kinetics of Stranski-Krastanov growth in a binary eutectic system is performed. One of the primary areas of interest is to understand how such a system behaves as the particle size decreases from large, where the bulk phase diagram is applicable, to small where terms such as the surface free energy may lead to depression of the eutectic temperature. Parallel with this research, work on 'Direct Methods' for determining surface structures is performed. The target here is to provide a general code that is freely available to solve, ab-initio, three-dimensional surface structures from transmission electron diffraction or surface x-ray diffraction data. A new area added to the program is charge-transfer at reconstructed surfaces which should in principle be detectable and quantifiable using transmission electron diffraction. Another area is a precession electron diffraction camera, which could become a very important tool in the future for determining structures using transmission electron diffraction. %%%As dimensions continue to decrease in electronic devices, there is no reason why metallic materials should follow the traditional bulk property behavior. This research employs classic metallurgy, surface science, and small particle science to better understand the properties and behavior of thin metallic films.***

0075834Marks在这个更新项目中，研究了二元共晶系统中STranski-Krastanov生长的结构、热力学和动力学。主要感兴趣的领域之一是了解当颗粒尺寸从大到小(适用于体相图)到小(如表面自由能等项可能导致共晶温度降低)时，这样一个系统的行为如何。在进行这项研究的同时，还开展了确定表面结构的直接方法方面的工作。这里的目标是提供一种通用程序，该程序可自由地用于从透射式电子衍射或表面x射线衍射数据中从头算出三维表面结构。该计划增加了一个新的领域，即重建表面上的电荷转移，原则上应该可以用透射电子衍射来检测和量化。另一个领域是进动电子衍射相机，它可能成为未来利用透射式电子衍射确定结构的非常重要的工具。%随着电子设备尺寸的不断减小，金属材料没有理由遵循传统的大块特性行为。这项研究运用了经典的冶金学、表面科学和小颗粒科学来更好地了解金属薄膜的特性和行为。