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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Atom Probe Tomography for Advanced Characterization of Metals, Minerals and Materials III
Presentation Title APT-based Stoichiometry Measurements of Single Crystal ThO2
Author(s) Amrita Sen, Mukesh Bachhav, Janelle Wharry
On-Site Speaker (Planned) Amrita Sen
Abstract Scope The objective of this study is to obtain accurate stoichiometric measurements of single crystal ThO2 using Laser-Atom Probe Tomography (APT). Compositional accuracy of insulators and metal-oxides materials by APT is known to be influenced by operating parameters such as laser energy, field condition, and base temperature. Systematic variation of these parameters reveals improved ThO2 stoichiometry with increasing laser energy and decreasing base temperature. However, interpretation of these results is not straightforward. As with other oxides, poor laser absorption due to low thermal conductivity of ThO2 results in non-uniform field evaporation behavior, introducing thermal effects into the obtained mass spectra. Generally, such thermal effects negatively impact compositional accuracy. However, ThO2 is distinct from other oxides in that improved stoichiometry is achieved from the thermally-affected mass spectra, compared to results from spectra with better mass resolution. The cause for this behavior, and its influence on interpretation of data will be discussed.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Review of Atom Probe Tomography Technology: The Present and Future
APT-based Stoichiometry Measurements of Single Crystal ThO2
APT for Atomic-scale Insights to the Origins of Materials Properties
Atom Probe Tomography of Refractory High Entropy Alloys
Atom Probe Tomography Study of Fission Products in Neutron Irradiated U-Mo Fuel
Characterization of Mechanical Properties of the A356 Cast Aluminum Alloy in Accordance with the Cluster Formation Behaviors at Different Aging Temperatures
Compositional Dependencies of Ni- and Fe-oxides to Experimental Parameters in Atom Probe Tomography
Coupled APT and TEM Investigation of Cu Assisted Nucleation of L12 Precipitates in FCC-based High Entropy Alloys
Elucidating Solute Clustering and Precipitation of Al-Cu-Mg-Ag-Si Model Alloys
Material Alterations in Intense Mechanical and Chemical Contacts
Morphological Classification of Dense Objects in Atom Probe Tomography Data
Nanoparticle Sample Preparation for Atom Probe Tomography: Chemical Fixation and Cryo-Fixation
Quantifying Compositional Uncertainty Arising from Peak Overlaps
Understanding Early Stages of Nanoscale Hydriding and Oxidation Mechanisms in Metallic Systems via Atom Probe Tomography and Multimodal Chemical Imaging

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