Acquisition of an Electron Backscatter Diffraction System

0320871BeaneThis重大研究仪器（MRI）计划拨款支持电子背散射衍射系统（EBSD）的收购，提供有限的PI工资支持和与仪器培训相关的差旅费，并支持相关耗材，样品制备设备和软件的收购。 EBSD将安装在鲍登学院地质系现有的现代扫描电子显微镜（SEM）上，该显微镜配备有能量色散光谱仪（EDS）。 分析晶体材料的背散射电子的衍射图案可以识别相及其晶格取向。该系统的扫描和绘图能力允许以亚微米分辨率从抛光岩石薄片快速获取数据。在其他用途中，这些数据可以应用于评估矿物织物的晶体学优选取向（CPO），并检查可能表示亚晶粒发育和位错蠕变等过程的取向差轴和角度。 EBSD是一种相对较新的分析能力，它允许地质学家测试矿物和岩石的现有成核、生长和变形模型，并开发新的模型。 EBSD设施将支持Bowdoin和地区学院和大学（包括Middlebury College和缅因州大学）的教师和学生的研究 *

0320871BeaneThis Major Research Instrumentation (MRI) Program grant supports the acquisition of an electron backscattered diffraction system (EBSD), provides limited PI salary support and travel costs associated with instrument training, and supports the acquisition of related consumables, sample preparation equipment and software. The EBSD will be installed on an existing modern scanning electron microscope (SEM) equipped with an energy-dispersive spectrometer (EDS) in the Department of Geology at Bowdoin College. Analysis of the diffraction pattern of backscattered electrons from crystalline materials allows identification of phase and its crystal lattice orientation. The scanning and mapping capabilities of the system permit rapid acquisition of data from polished rock thin sections at sub-micron resolutions. Among other uses, these data may be applied to evaluate crystallographic preferred orientations (CPO) of mineral fabrics, and to examine misorientation axes and angles that may signify processes such as subgrain development and dislocation creep. EBSD is a relatively new analytical capability that allows geologists to test existing nucleation, growth, and deformation models for minerals and rocks, and to develop new ones. The EBSD facility will support faculty and students research at Bowdoin and regional colleges and universities including Middlebury College and the University of Maine***