Electron Diffraction and Imaging of Crystal Defects and Surfaces

晶体缺陷和表面的电子衍射和成像

• 批准号: 9110386
• 负责人: John Cowley
• 金额: $ 46.5万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-09-01 至 1995-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9110386&HistoricalAwards=false
• 关键词: Electron; Diffraction; Imaging; Crystal; Defects

This research is for the development of advanced electron microscopy techniques and their use in material science. Specific techniques of interest are in-line holography in a scanning transmission electron microscope (STEM) and high-angle annular dark-field (HAADF) STEM imaging. In-line holography promises to be a feasible means to enhance STEM resolution without the requirement of higher accelerating voltage. HAADF imaging will be well suited to study crystal defects and surface layers. In particular, the above techniques will be applied to studying ferroelectric domain structures in thin crystals of barium titanate. The results of this research are expected to have a major impact on our ability to characterize technologically important material systems.

这项研究是为了开发高级电子显微镜技术及其在材料科学中的使用。感兴趣的特定技术是扫描透射电子显微镜（STEM）和高角度环形暗场（HAADF）茎成像中的在线全息图。在线全息图有望成为提高茎分辨率的一种可行手段，而无需更高的加速电压。 HAADF成像将非常适合研究晶体缺陷和表面层。特别是，上述技术将应用于研究钛酸钡薄晶体中的铁电域结构。预计这项研究的结果将对我们表征技术重要的材料系统的能力产生重大影响。