Field Emission Scanning Electron Microscope with EBSD, EDS and CL

配备 EBSD、EDS 和 CL 的场发射扫描电子显微镜

• 批准号: 457729156
• 金额: --
• 依托单位: Martin-Luther-Universität Halle-Wittenberg
• 依托单位国家: 德国
• 项目类别: Major Research Instrumentation
• 财政年份: 2021
• 资助国家: 德国
• 起止时间: 2020-12-31 至 无数据
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/457729156?language=en
• 关键词: Field; Emission; Scanning; Electron; Microscope

For the research of the Geodynamics group as well as the other geoscientific and soil scientific working groups of the Faculty of Natural Sciences III of the Martin-Luther-University Halle-Wittenberg (MLU) the analysis of structure, crystallographic orientation and chemical composition of rocks and geomaterials is essential. The scientific problems require analysis capabilities in the range of centimeters to sub-micrometers. A scanning electron microscope (SEM) allows for the investigation of surface and phase contrast in this size range. Crystallographic orientations of the mineral phases are measured by an EBSD (Electron backscatter diffraction) detector. The chemical analysis is carried out by an EDS (Energy dispersive X-ray spectroscopy) detector. Zonations as well as the distribution of trace elements and crystal defects are imaged by a CL (Cathodoluminescence) detector. The planned investigations over at least five orders of magnitude (range of centimeters to sub-micrometers) necessitate both a high spatial resolution and also fast measurements in order to enable mappings of large sample areas. For that, a Schottky field emission scanning electron microscope (FEG-SEM) is indispensable as it provides the required beam parameters and beam stability.The FEG-SEM will primarily be used for the analysis of deformation fabrics in rocks. The spectrum of investigations ranges from nanoscale earthquake processes in the upper crust to the development of shear zones in rocks with up to millimeter-scale mineral grains as they occur in the lower crust and mantle of the Earth. For the research on the micro- or rather nano-mechanical processes of fracturing, frictional sliding or viscous creep high-resolution imaging techniques, crystallographic measurements and chemical results of the SEM analysis are necessary. Apart from these investigations that help to improve our understanding of plate tectonic processes and also earthquake nucleation, the new instrument shall be used to quantify the distribution and orientation of mineral grains to determine the physical and chemical properties of various rocks and geomaterials. This is important for geophysical and seismic studies or for technical applications of natural stone manufacture, tunnel construction, geothermal energy, ultimate waste disposal, ceramic and cementitious research as well as further topics concerning applied geology, mineral deposit exploration and technical mineralogy. Beside the wide field of geoscientific research goals the new instrument is also needed for soil scientific research at the MLU. Main topics are interactions between soil minerals and organic matter influenced by weathering, various environmental factors and climate change.

用于哈勒维滕贝格马丁路德大学 (MLU) 地球动力学小组以及自然科学第三学院其他地球科学和土壤科学工作组的研究，分析岩石的结构、晶体取向和化学成分而土工材料是必不可少的。科学问题需要厘米到亚微米范围内的分析能力。扫描电子显微镜 (SEM) 可以研究该尺寸范围内的表面和相差。矿物相的晶体取向通过 EBSD（电子背散射衍射）检测器测量。化学分析通过 EDS（能量色散 X 射线光谱）检测器进行。分区以及痕量元素和晶体缺陷的分布由 CL（阴极发光）探测器成像。计划进行的研究至少需要五个数量级（厘米到亚微米的范围），因此需要高空间分辨率和快速测量，以便能够绘制大样本区域的地图。为此，肖特基场发射扫描电子显微镜 (FEG-SEM) 是必不可少的，因为它提供所需的光束参数和光束稳定性。FEG-SEM 将主要用于分析岩石中的变形结构。研究范围从上地壳的纳米级地震过程到地球下地壳和地幔中含有毫米级矿物颗粒的岩石剪切带的发展。为了研究断裂、摩擦滑动或粘性蠕变的微米或更确切地说纳米机械过程，高分辨率成像技术、晶体学测量和 SEM 分析的化学结果是必要的。除了这些有助于提高我们对板块构造过程和地震成核作用的了解之外，新仪器还将用于量化矿物颗粒的分布和方向，以确定各种岩石和岩土材料的物理和化学性质。这对于地球物理和地震研究或天然石材制造、隧道施工、地热能、最终废物处理、陶瓷和水泥研究的技术应用以及有关应用地质学、矿床勘探和技术矿物学的进一步主题非常重要。除了广泛的地球科学研究目标之外，MLU 的土壤科学研究也需要新仪器。主要议题是受风化、各种环境因素和气候变化影响的土壤矿物质和有机质之间的相互作用。