Thermal effects on mass and spatial resolution during laser pulse atom probe tomography of cerium oxide

• Published in: Journal of nuclear materials Vol. 436; no. 1-3; pp. 23 - 28
• Main Authors: Kirchhofer, Rita, Teague, Melissa C., Gorman, Brian P.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01-05-2013; Elsevier
• Subjects: Applied sciences; atom probe tomography; Controled nuclear fusion plants; Energy; Energy. Thermal use of fuels; Exact sciences and technology; Fission nuclear power plants; Fuels; Installations for energy generation and conversion: thermal and electrical energy; MATERIALS SCIENCE; Nuclear fuels; Preparation and processing of nuclear fuels; Temperature measurement; Thermal properties; Fission product; Laser; Tomography; Nuclear fuel; Evaporation; Cerium oxide; Nuclear fission; Nuclear reactor
• ISSN: 0022-3115; 1873-4820
• DOI: 10.1016/j.jnucmat.2012.12.052

► Cerium oxide, a surrogate for nuclear fuels, was used for atom probe tomography. ► Stoichiometric field evaporation of CeO2 was produced using laser pulsed APT. ► The effect of laser energy and specimen base temperature was studied. ► Mass resolving power was optimized for the run conditions with high specimen yield. ► Spatial resolution in the nm-scale was maximized by reducing laser energy.
Cerium oxide (CeO2) is an ideal surrogate material for trans-uranic elements and fission products found in nuclear fuels due to similarities in their thermal properties; therefore, cerium oxide was used to determine the best run condition for atom probe tomography (APT) of nuclear fuels. Laser-assisted APT is a technique that allows for spatial resolution in the nm scale and isotopic/elemental chemical identification. A systematic study of the impact of laser pulse energy and specimen base temperature on the mass resolution, measurement of stoichiometry, multiple detector hits, and evaporation mechanisms are reported in this paper. It was demonstrated that using laser-assisted APT stoichiometric field evaporation of cerium oxide was achieved at 1pJ laser pulse energy and 20K specimen base temperature.