Materials World Network: Measurement of Local Charge Distributions in Materials

材料世界网络：材料局部电荷分布的测量

• 批准号: 0710643
• 负责人: Laurence Marks
• 金额: $ 30万
• 依托单位: Northwestern University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-09-01 至 2010-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0710643&HistoricalAwards=false
• 关键词: Materials; World; Network; Measurement; Local

This Materials World Network award to Northwestern University is for collaborative research to develop the experimental methodology and theoretical framework necessary to directly image charge distribution at the atomic level in a range of technologically important oxide materials. These materials are used extensively in catalysis; as new dielectric, ferroelectric and in some cases magnetic devices and in oxygen transport membranes and fuel-cells; they are also critical in many corrosion problems. Conventional measurements of charge are carried out with blunt instruments which necessarily result in average values that are often not relevant for materials and devices where properties vary on the atomic scale. Hence, in order to understand the effects of charge distribution on material properties it is necessary to direct develop methods for imaging charge. This proposal therefore aims to develop experimental approaches to charge imaging using both Scanning Tunneling Microscopy and High Resolution Transmission Electron Microscopy and electron diffraction and to correlate results from these. This program will bring together two research groups at Northwestern University and Oxford University, Great Britain with complementary skills and unique instrumentation: a double aberration-corrected transmission electron microscope in Oxford and an ultra-high vacuum transmission electron microscope at Northwestern as well as the complimentary tool of scanning tunneling microcopy in Oxford. In addition to conventional exchange of information via email and videoconferencing (including the utilization of access grid facilities), there will also be exchange visits by junior scientists and doctoral students. The programs that are developed as part of the collaborative research will be made publicly available.

西北大学获得的材料世界网络奖旨在表彰合作研究，开发必要的实验方法和理论框架，以直接对一系列技术上重要的氧化物材料中原子水平的电荷分布进行成像。这些材料广泛用于催化；作为新的介电、铁电和某些情况下的磁性装置以及氧传输膜和燃料电池；它们在许多腐蚀问题中也至关重要。 传统的电荷测量是使用钝仪器进行的，这必然会产生平均值，而这些平均值通常与属性在原子尺度上变化的材料和设备无关。因此，为了了解电荷分布对材料特性的影响，有必要直接开发电荷成像方法。因此，该提案旨在开发使用扫描隧道显微镜、高分辨率透射电子显微镜和电子衍射进行电荷成像的实验方法，并将这些结果关联起来。该项目将汇集英国西北大学和牛津大学的两个研究小组，他们拥有互补的技能和独特的仪器：牛津的双像差校正透射电子显微镜和西北大学的超高真空透射电子显微镜，以及牛津的扫描隧道显微镜的免费工具。除了通过电子邮件和视频会议（包括利用接入网格设施）进行的常规信息交换外，还将进行初级科学家和博士生的互访。作为合作研究一部分开发的项目将公开。