Acquisition of an Automated Digital Transmission Electron Microscope

9626279史密斯透射电子显微镜（TEM）已经成为材料研究的支柱约40年，仍然是世界上最重要的科学仪器之一。 在过去的20年里，Lehigh在TEM分析研究和TEM用户教育方面保持着领先地位。 该奖项提供资金，部分支持购买自动数字透射电子显微镜（ADTEM），用于材料的化学和结构成像，重点是原位研究。 ADTEM将结合联合收割机优于0.23纳米的分辨率与30度的倾斜在各种侧进入试样夹。 该显微镜将具有电子能量过滤器，可以产生高清晰度的能量过滤图像和衍射图案。 包括支持加强和升级标本制备设备和图像分析设施。 数字采集的图像将可从校园内外的任何联网终端访问。 收购拟议的ADTEM将影响这些正在进行或计划中的研究计划在四个推力领域：1）薄膜，2）非晶和纳米结构，3）陶瓷和陶瓷复合材料，以及4）环境敏感性断裂。 20多个教师的研究计划将受到拟议的ADTEM的影响。 薄膜领域的研究计划包括CoPt磁信息存储的研究以及Nb/Al，Ni/Al和Ti/Al多层膜反应中晶粒结构和晶界扩散的作用。 在无定形和纳米结构的推动下，正在进行无机和有机材料的各种研究：非晶硅的结晶，具有优化的晶粒结构的铜互连的开发，通过EXELFS确定无机玻璃中轻原子周围的结构，用于增韧工程塑料的核/壳颗粒的新设计概念，以及束敏感催化剂材料的能量过滤衍射。 在陶瓷和陶瓷复合材料的推力领域，正在研究为开发超级抗蠕变氧化物而定制晶界化学，纳米复合材料的加工和性能，以及功能梯度氧化铝/铝复合材料的反应成型以获得最佳机械性能。 环境敏感性断裂的最后一个研究领域的研究计划涉及高温合金蠕变裂纹扩展和铝合金腐蚀与疲劳的环境和随机方面。 ADTEM的教育作用将是在各种本科和研究生课程的实验室部分演示高分辨率结构成像，高级衍射和能量过滤显微镜。 学生将在我们现有的IBM RS6000集群和拟议的Macintosh 8100集群中离线分析来自该显微镜的数字图像。 ***

9626279 Smith The transmission electron microscope (TEM) has been a mainstay of materials research for about forty years and remains one of the world's most important scientific instruments. Over the last 20 years Lehigh has maintained a leadership position in analytical TEM research and in the education of TEM users. This award provides funds in partial support of the purchase of an automated digital transmission electron microscope (ADTEM) for chemical and structural imaging of materials with an emphasis on in-situ studies. The ADTEM will combine better than 0.23 nm resolution with 30 of tilt in a variety of side entry specimen holders. The microscope will feature an electron energy filter which can produce high clarity energy-filtered images and diffraction patterns. Included is support for enhancing and up-grading the specimen preparation equipment and image analysis facilities. The digitally acquired images will be accessible from any networked terminal on or off campus. %%% The acquisition of the proposed ADTEM will impact these ongoing or planned research programs in the four thrust areas of: 1) thin films, 2) amorphous and nanoscale structures, 3) ceramics and ceramic composites, and 4) environment-sensitive fracture. The research programs of more than 20 faculty will be impacted by the proposed ADTEM. The research programs in the area of thin films include a study of CoPt for magnetic information storage and the role of grain structure and grain boundary diffusion in the reaction of Nb/Al, Ni/Al and Ti/Al multilayers. Under the thrust area of amorphous and nanoscale structures a variety of studies in inorganic and organic materials are being pursed: crystallization of amorphous silicon, development of copper interconnects with optimized grain structures, determination of structure around light atoms in inorganic glasses by EXELFS, novel design concepts in core/shell particles for toughening engineering plastics, and energy filtered diffracti on of beam sensitive catalyst materials. In the thrust area of ceramics and ceramic composites, tailoring of grain boundary chemistry for the development of super creep-resistant oxides, processing and properties of nanocomposites, and reaction forming of functionally gradient aluminum oxide/aluminum composites for optimal mechanical properties are under investigation. The research programs in the last thrust area of environment- sensitive fracture address environmental and stochastic aspects of creep crack growth in super-alloys and corrosion and fatigue of aluminum alloys. The educational role of the ADTEM will be to demonstrate high resolution structure imaging, advanced diffraction, and energy filtered microscopy in the laboratory section of a variety of undergraduate and graduate courses. Digital images from this microscope will be analyzed by students off-line in our existing cluster of IBM RS6000s and proposed cluster of Macintosh 8100s. ***