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.

对于地球动力学小组的研究，以及马丁 - 勒斯特大学（Martin-Luther-University）自然科学学院III的其他地球科学和土壤科学工作组，对岩石和地球物质的结构，晶体学取向和化学组成的结构，晶体学取向和化学组成的分析至关重要。科学问题需要在厘米到亚微米的范围内进行分析功能。扫描电子显微镜（SEM）允许在此尺寸范围内研究表面和相位对比度。通过EBSD（电子反向散射）检测器测量矿物相的晶体学取向。化学分析是通过EDS（能量色散X射线光谱）检测器进行的。分区以及痕量元素和晶体缺陷的分布是通过CL（阴极发光）检测器成像的。对至少五个数量级（厘米到亚微米的范围）进行的计划调查既需要高空间分辨率，又需要快速测量，以便能够映射大型样品区域。为此，由于提供了所需的光束参数和梁的稳定性，因此Schottky场发射扫描电子显微镜（FEG-SEM）是必不可少的。FEG-SEM将主要用于分析岩石中变形织物的分析。调查的范围从上皮的纳米级地震过程到岩石中的剪切区的发展，到岩石尺度矿物颗粒，它们发生在地球下地壳和地下。为了研究破裂，摩擦滑动或粘稠的高分辨率成像技术的微型机械过程，必须进行SEM分析的化学测量和化学结果。除了这些研究有助于提高我们对板块构造过程以及地震成核的理解外，还应使用新仪器来量化矿物晶粒的分布和方向，以确定各种岩石和地质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，隧道建设，地热能量，最终废物处理，陶瓷和水泥研究以及有关应用地质，矿产沉积勘探和技术矿物学的进一步主题很重要。除了广泛的地质研究目标外，新工具还需要MLU的土壤科学研究。主要主题是土壤矿物质与有机物之间的相互作用，受风化，各种环境因素和气候变化影响。