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An analytical model accounting for tip shape evolution during atom probe analysis of heterogeneous materials

机译：异质材料原子探针分析过程中考虑尖端形状演变的分析模型

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摘要

An analytical model describing the field evaporation dynamics of a tip made of a thin layer deposited on a substrate is presented in this paper. The difference in evaporation field between the materials is taken into account in this approach in which the tip shape is modeled at a mesoscopic scale. It was found that the non-existence of sharp edge on the surface is a sufficient condition to derive the morphological evolution during successive evaporation of the layers. This modeling gives an instantaneous and smooth analytical representation of the surface that shows good agreement with finite difference simulations results, and a specific regime of evaporation was highlighted when the substrate is a low evaporation field phase. In addition, the model makes it possible to calculate theoretically the tip analyzed volume, potentially opening up new horizons for atom probe tomographic reconstruction. (C) 2015 Elsevier B.V. All rights reserved.
机译：本文提出了一种分析模型，该模型描述了由沉积在基板上的薄层制成的尖端的场蒸发动力学。在这种方法中考虑了材料之间蒸发场的差异，在这种方法中，尖端形状以介观尺度建模。发现在表面上不存在尖锐边缘是在连续蒸发各层期间获得形态演变的充分条件。该模型给出了表面的瞬时且平滑的解析表示，与有限差分模拟结果显示出良好的一致性，并且当基材为低蒸发场相时，突出显示了特定的蒸发方式。此外，该模型使理论上计算尖端分析的体积成为可能，从而有可能为原子探针层析成像重建开辟新的视野。 （C）2015 Elsevier B.V.保留所有权利。

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