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Influence of field conditions on quantitative analysis of single crystal thorium dioxide by atom probe tomography
Ultramicroscopy ( IF 2.2 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.ultramic.2020.113167
Amrita Sen , Mukesh Bachhav , Francois Vurpillot , J. Matthew Mann , Phyllis K. Morgan , Timothy A. Prusnick , Janelle P. Wharry

Atom probe tomography (APT), a 3D microscopy technique, has great potential to reveal atomic scale compositional variations, such as those associated with irradiation damage. However, obtaining accurate compositional quantification by APT for high bandgap materials is a longstanding challenge, given the sensitivity to field evaporation parameters and inconsistent behaviors across different oxides. This study investigates the influence of APT laser energy and specimen base temperature on compositional accuracy in single crystal thoria (ThO2). ThO2 has a broad range of applications, including advanced nuclear fuels, sensors, lasers and scintillators, electrodes, catalysis, and photonics and optoelectronics. The expected stoichiometry of ThO2 is achieved at APT base temperature of 24 K and laser energy of 100 pJ. To overcome mass resolution limitations associated with significant thermal tails, Bayesian methods are applied to deconvolute ion identity within the mass spectra. This approach affirms that the parameters chosen are appropriate for APT analysis of ThO2.

中文翻译:

野外条件对单晶二氧化钍原子探针断层扫描定量分析的影响

原子探针断层扫描 (APT) 是一种 3D 显微技术,具有揭示原子级成分变化的巨大潜力,例如与辐射损伤相关的成分变化。然而,考虑到场蒸发参数的敏感性和不同氧化物的不一致行为,通过 APT 获得高带隙材料的准确成分量化是一项长期挑战。本研究调查了 APT 激光能量和样品基底温度对单晶氧化钍 (ThO2) 成分精度的影响。ThO2 具有广泛的应用,包括先进的核燃料、传感器、激光器和闪烁体、电极、催化以及光子学和光电子学。ThO2 的预期化学计量是在 24 K 的 APT 基础温度和 100 pJ 的激光能量下实现的。为了克服与显着热尾相关的质量分辨率限制,应用贝叶斯方法来解卷积质谱中的离子特性。这种方法确认所选参数适用于 ThO2 的 APT 分析。
更新日期:2021-01-01
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