Acquisition of an Atomic-Resolution Transmission Electron Miscroscope

材料科学的主要重点是理解和控制材料的加工-结构-性能关系。为了实现这一目标，有必要在最高分辨率下定量表征组分相的组成、晶体结构、界面结构、缺陷结构和形貌。在这项建议中，请拨经费购买JEOL 4000EX原子分辨率透射电子显微镜和Gatan 622型录象系统和录音机。Jeol 4000EX显微镜的点对点分辨率为- 0.19 nm，可以对大多数材料中的缺陷和界面的原子结构进行直接成像。而Gatan视频系统将允许快速校正显微镜像差和记录动态事件。卡内基梅隆大学目前有许多多学科的综合材料研究项目，如高温复合材料的大学研究计划，薄膜科学的国际商业机器中心，以及磁性材料的NSF材料研究小组。在所有这些研究中，以及在许多个人研究项目中，在原子水平上表征内部缺陷、相变、界面结构和成分对于理解材料行为至关重要。拥有一台原子分辨率的显微镜将大大加强我们在卡内基-梅隆大学电子光学设施以及匹兹堡地区其他材料设施中建立处理-结构-性质之间基本相互关系的能力，这些设施都没有高分辨率的显微镜。卡耐基梅隆大学的教职员工在传统和原子分辨率显微镜技术方面具有足够的专业知识，以确保原子分辨率显微镜用于最高质量的材料研究，并保持其最佳性能水平。卡耐基-梅隆大学承诺为购买仪器和维护仪器提供大量配套资金。

The principal emphasis in materials science is to understand and control the processing-structure-properties relationships in materials. In order to achieve this, it is necessary to quantitatively characterize the composition, crystal structure, interfacial structure, defect structure and morphology of the component phases at the highest levels of resolution. In this proposal, funds are requested for the purchase of a JEOL 4000EX atomic-resolution transmission electron microscope and a Gatan Model 622 video system and recorder. The Jeol 4000EX microscope has a point-to-point resolution of - 0.19 nm and will permit direct imaging of the atomic structures of defects and interfaces in most materials, whereas the Gatan video system will allow rapid correction of microscope aberrations and recording of dynamic events. Carnegie-Mellon University currently has a number of multi- disciplinary comprehensive materials research programs, such as a University Research Initiative in high-temperature composites, an International Business Machines Center for thin-film sciences, and a NSF Materials Research Group in magnetic materials. In all of these, as well as in many individual investigator programs, characterization of internal defects, phase transformations and interfacial structures and compositions at the atomic level is essential for understanding material behavior. Having an atomic-resolution microscope will considerably strengthen our ability to establish fundamental interrelations among the processing-structure-properties in electron optics facility at Carnegie-Mellon University as well as at other materials facilities in the Pittsburgh area, none of which has a high-resolution microscope. Carnegie-Mellon University has both faculty and staff with sufficient expertise in conventional and atomic-resolution microscopy techniques to ensure that the atomic-resolution microscope is utilized for the highest quality materials research, and that it is maintained at an optimum level of performance. Carnegie-Mellon University pledges to provide significant matching funds for purchase of the instrument and resources for its maintenance.