The spatial correlation between defects in crystalline materials and trace element segregation plays a fundamental role in determining the physical and mechanical properties of a material, which is particularly important in naturally deformed materials. Herein, we combine electron backscatter diffraction, electron channelling contrast imaging, scanning transmission electron microscopy and atom probe tomography on a naturally occurring metal sulphide in an attempt to document mechanisms of element segregation in a brittle-dominated deformation regime. Within APT reconstructions, features with a high point density comprising O-rich discs stacked over As-rich spherules are observed. The combined microscopy data allow us to interpret these as nanoscale fluid inclusions. Our observations are confirmed by simulated APT experiments of core-shell particles with a core exhibiting a very low evaporation field and the shell emulating a segregated layer at the inclusion interface. Our data has significant trans-disciplinary implications to the geosciences, the material sciences, and analytical microscopy.

中文翻译：

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通过原子探针层析成像分析地质材料中纳米级流体包裹体：实验和数值模拟

晶体材料中的缺陷与微量元素偏析之间的空间相关性在决定材料的物理和机械性能方面起着基础性作用，这在自然变形材料中尤为重要。在此，我们将电子背散射衍射、电子通道对比成像、扫描透射电子显微镜和原子探针断层扫描结合在天然存在的金属硫化物上，试图记录脆性主导变形区域中元素偏析的机制。在 APT 重建中，观察到具有高点密度的特征，包括堆叠在富含 As 的球粒上的富含 O 的圆盘。组合的显微镜数据使我们能够将这些解释为纳米级流体包裹体。我们的观察通过核壳颗粒的模拟 APT 实验得到证实，核壳颗粒表现出非常低的蒸发场，壳层模拟夹杂物界面处的分离层。我们的数据对地球科学、材料科学和分析显微镜具有重要的跨学科影响。