Direct observation of pure pentavalent uranium in U2 O5 thin films by high resolution photoemission spectroscopy

Scientific Reports
T GouderR Caciuffo

Abstract

Thin films of the elusive intermediate uranium oxide U2O5 have been prepared by exposing UO3 precursor multilayers to atomic hydrogen. Electron photoemission spectra measured about the uranium 4f core-level doublet contain sharp satellites separated by 7.9(1) eV from the 4f main lines, whilst satellites characteristics of the U(IV) and U(VI) oxidation states, expected respectively at 6.9(1) and 9.7(1) eV from the main 4f lines, are absent. This shows that uranium ions in the films are in a pure pentavalent oxidation state, in contrast to previous investigations of binary oxides claiming that U(V) occurs only as a metastable intermediate state coexisting with U(IV) and U(VI) species. The ratio between the 5f valence band and 4f core-level uranium photoemission intensities decreases by about 50% from UO2 to U2O5, which is consistent with the 5f 2 (UO2) and 5f 1 (U2O5) electronic configurations of the initial state. Our studies conclusively establish the stability of uranium pentoxide.

References

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Citations

Aug 16, 2018·Chemical Communications : Chem Comm·Kristina O KvashninaMarc Verwerft
Dec 6, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Florian JolyChristophe Volkringer
Dec 22, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Ghada El JamalMats Jonsson
Apr 21, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Ghada El JamalMats Jonsson
Jul 22, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Ghada El JamalMats Jonsson
Nov 6, 2021·Journal of Synchrotron Radiation·Roberto Caciuffo, Gerard H Lander

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Methods Mentioned

BETA
x-ray absorption spectroscopy
thermal treatment
X-ray
electron cyclotron resonance

Software Mentioned

Origin
CasaXPS

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