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来自原子探头断层扫描数据的界面过量计算中的不确定性.
1School of Aerospace, Mechanical, and Mechatronic Engineering, Australian Centre for Microscopy and Microanalysis, The University of Sydney, Camperdown, New South Wales, Australia.
Journal of microscopy
|February 21, 2025
概括
原子探头断层扫描 (APT) 测量界面上的溶液分离可能具有显著的不确定性. 这项研究模拟了APT中的组成不确定性,揭示了稀释溶液的较大相对误差,并提供了最小化它们的策略.
科学领域:
- 材料科学 材料科学 材料科学
- 表面科学是一门学科.
- 分析化学 分析化学
背景情况:
- 原子探头断层扫描 (APT) 是分析内部接口的溶液分离的一个关键技术.
- 现有的APT协议往往忽略了与稀释溶液相关的组成不确定性.
- 准确量化界面过剩对于理解材料特性至关重要.
研究的目的:
- 开发在接口处溶解物成分配置的一般模型,并纳入组成的不确定性.
- 评估这种不确定性对计算的界面过剩的影响.
- 为最小化APT数据分析中的不确定性提供策略.
主要方法:
- 在接口上的溶液分离的一般模型的推导.
- 将模型与实验数据相匹配,包括累积的组成不确定性.
- 分析不同的边界估计方法及其对结果的影响.
主要成果:
- 对稀释溶液而言,界面过剩的相对不确定性可能很大,即使具有明确的分离谱.
- 不同的边界估计方法产生不同的界面过量和不确定性值.
- 兴趣区域中溶液计数的数量从根本上限制了精度.
结论:
- 组成的不确定性是APT分析稀溶物分离的关键因素.
- 需要仔细的建模和边界估计,以准确量化界面过量.
- 尽量减少不确定性,需要考虑APT中有限的溶液计数的策略.
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