Abstract
The physical and chemical properties of actinide-bearing materials, as well as other radionuclides, such as fission product elements from the nuclear fuel cycle, depend greatly on their electronic configuration, crystal structure, thermochemical parameters, and the amount of impurity elements at the atomic scale. Further, nanoscale particles may have distinctly different properties from the bulk composition. In order to understand the properties of such materials, direct characterization at the nanoscale is essential. This chapter reviews relevant methods for direct analysis of nanoscale materials using a focused electron beam, scanning transmission electron microscopy (STEM), in which the electron probe can be less than an Å size with the current high enough to perform elemental analysis. High-angle annular dark-field STEM (HAADF-STEM) provides an incoherent image by which the intensity correlates with the atomic number. The HAADF-STEM image can be greatly enhanced by a theoretical filtering method, such as the maximum entropy method. Electron energy-loss spectroscopy (EELS) allows the investigation of the chemical state including oxidation state and the electron density of states at the nanoscale. Three dimensional electron tomography with STEM or TEM imaging is another useful method for obtaining morphological and topological information of nanoscale materials. In addition, the recent development of the aberration corrector for spherical aberration (C S) has achieved a sub-Å probe as small as ~0.5 Å in STEM, which greatly improves the spatial resolution of images and chemical analyses. The application of C S-corrected STEM has not been explored in actinide research; however, it has great potential in the investigation of the properties of actinide materials at the atomic-level.
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Acknowledgments
The authors acknowledge the staff of the high voltage electron microscopy (HVEM) laboratory at Kyushu University for their technical support and daily maintenance. SU also thanks the members of the nanogeoscience group in the Department of Chemistry at Kyushu University for their help and constructive discussion. R.C. Ewing acknowledges support from the Energy Frontier Research Center, Materials Science of Actinides, funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award Number DE-SC0001089.
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Utsunomiya, S., Kogawa, M., Kamiishi, E., Ewing, R.C. (2011). Scanning Transmission Electron Microscopy and Related Techniques for Research on Actinide and Radionuclide Nanomaterials. In: Kalmykov, S., Denecke, M. (eds) Actinide Nanoparticle Research. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-11432-8_2
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