原子探针层析成像在原子邻域分析中空间性能的思考
Reflections on the spatial performance of atom probe tomography in the analysis of atomic neighbourhoods
摘要：
原子探针断层扫描通常被引入作为提供材料组成的“原子尺度”映射，并且因此通常被利用来分析材料内的原子邻域。然而，在一般情况下量化该技术的实际空间性能仍然具有挑战性，因为它们取决于正在研究的材料系统以及试样的几何形状。在这里，通过使用场离子显微镜实验和场离子成像和场蒸发模拟的比较，我们提供的基础上的原子探针断层扫描的空间性能的分析纯金属，低合金化系统和浓缩的固溶体（即类似于高熵合金）的关键反射。空间分辨率对测量的原子邻域的可能解释施加了很大的限制，并且限于深度的方向邻域分析预计将更加稳健。我们希望这项工作让社区反思其做法，同样，它让我们反思我们的工作。
英文摘要：
Atom probe tomography is often introduced as providing "atomic-scale" mapping of the composition of materials and as such is often exploited to analyse atomic neighbourhoods within a material. Yet quantifying the actual spatial performance of the technique in a general case remains challenging, as they depend on the material system being investigated as well as on the specimen's geometry. Here, by using comparisons with field-ion microscopy experiments and field-ion imaging and field evaporation simulations, we provide the basis for a critical reflection on the spatial performance of atom probe tomography in the analysis of pure metals, low alloyed systems and concentrated solid solutions (i.e. akin to high-entropy alloys). The spatial resolution imposes strong limitations on the possible interpretation of measured atomic neighbourhoods, and directional neighbourhood analyses restricted to the depth are expected to be more robust. We hope this work gets the community to reflect on its practices, in the same way, it got us to reflect on our work.
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