Additional complexity in the Raman spectra of U3O8

Additional complexity in the Raman spectra of U3O8

Uranium oxides are readily amenable to investigation using Raman spectroscopy, and this technique is frequently used as a chemical analysis tool. We show, in triuranium octoxide (U3O8), the presence of previously unreported Raman peaks located below 100 cm−1. By maximum intensity, the strongest peak...

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Bibliographic Details
Published in:Journal of nuclear materials Vol. 527; no. C; p. 151790
Main Authors: Miskowiec, A., Niedziela, J.L., Spano, T.L., Ambrogio, M.W., Finkeldei, S., Hunt, R., Shields, A.E.
Format: Journal Article
Language:English
Published: Amsterdam Elsevier B.V 15-12-2019
Elsevier BV
Elsevier
Subjects:
Chemical analysis
Crystal defects
Crystal lattices
Crystal structure
Organic chemistry
Oxides
Oxygen content
RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
Raman spectra
Raman spectroscopy
Spectroscopy
Spectrum analysis
U3O8
Uranium
Uranium dioxide
Uranium oxides
U3O8
Raman spectroscopy
Uranium oxides
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Summary:Uranium oxides are readily amenable to investigation using Raman spectroscopy, and this technique is frequently used as a chemical analysis tool. We show, in triuranium octoxide (U3O8), the presence of previously unreported Raman peaks located below 100 cm−1. By maximum intensity, the strongest peak in U3O8 appears at 54 cm−1 and is resolution limited, making this mode an ideal candidate for chemically identifying U3O8 using Raman spectroscopy. Detailed peak analysis indicates that the main spectral feature between 300 and 500 cm−1 is more accurately described by a septet than a triplet. Two samples of differing oxygen content show only minor differences in bulk crystal structure, but subtle changes in lattice dynamics are suggestive of defect scattering in analogy to UO2+x. [Display omitted] •U3O8 has strong, low-energy Raman-active modes.•Defect driven phonon lifetime suppression may be present in U3O8.•Detailed peak fitting analysis may suggest subtle differences in spectra correlated with oxidation.
Bibliography:USDOE
AC05-00OR22725
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2019.151790