|
|||||
|
|
Characterization of zirconia-thoria-urania ceramics by X-ray and electron interactions |
|
| Authors: | Gini Curran Wendy Rattray K.R Czerwinski |
| Affiliation: | a Actinide Research Group, Department of Nuclear Engineering, Massachusetts Institute of Technology, NW13-219, 77 Massachusetts Avenue, Cambridge, MA 02139, USA b Ecole Nationale Supérieure de Chimie de Paris, 11, rue Pierre et Marie Curie, 75005 Paris, France c Glenn Seaborg Institute, Lawrence Livermore National Laboratory, 7000 East Avenue, P.O. Box 808, L-231, Livermore, CA 94511 USA |
| Abstract: | X-ray and electron interactions with matter were used as probes to characterize the structure and chemistry of zirconia-thoria-urania ceramics. The ceramics were prepared by coprecipitation of Zr, Th and U salts. In this study, transmission electron microscopy (TEM) techniques such as energy dispersive X-ray (EDX) analysis and electron energy loss spectroscopy (EELS) complement X-ray diffraction, extended X-ray absorption fine structure (EXAFS) and X-ray absorption near edge spectroscopy (XANES), techniques to reveal the phase structure and chemistry. The results from XRD and EDX show that these ceramics separate into a Zr-based phase and an actinide-based phase with low mutual affinity of Th and Zr, as well as partial solubility of U in Zr. The comparison of EELS spectra collected for the ceramics with spectra collected for UO2 and U3O8 reference materials also allow us to assess U oxidation state independently in the two separate phases. |
| Keywords: | E0300 F0700 T0700 U0200 Z0200 |
| 本文献已被 ScienceDirect 等数据库收录！ | |