Determination of the Uranium Valence State in the Brannerite Structure using EELS, XPS, and EDX
Journal Article
·
· Physics and Chemistry of Minerals
In this study, the valence states of uranium in synthetic and natural brannerite samples were studied using a combination of transmission electron microscopy-electron energy loss spectroscopy (TEM-EELS), scanning electron microscopy-energy dispersive x-ray analysis (SEM-EDX) and x-ray photoelectron spectroscopy (XPS) techniques. We used a set of five (UO2, CaUO4, SrCa2UO6, UTi2O6, Y0.5U0.5Ti2O6) U standard samples, including two synthetic brannerites, to calibrate the EELS branching ratio, M5/(M4 +M5), against the number of f electrons. The EELS data were collected at liquid nitrogen temperature in order to minimize the effects of electron beam reduction of U(VI) and U(V).
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 15020573
- Report Number(s):
- PNNL-SA-42441; 2472; 830403000
- Journal Information:
- Physics and Chemistry of Minerals, Journal Name: Physics and Chemistry of Minerals Journal Issue: 2 Vol. 78
- Country of Publication:
- United States
- Language:
- English
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