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Title: Oxygen K-Edge X-ray Absorption Spectra of ThO2 and CeO2: Experiment, Interpretation, and Structural Effects

Abstract

Experimental oxygen K-edge spectra of ThO2 and CeO2 are presented and interpreted based on density functional theory (DFT). The contribution of d and f orbitals to the O K-edge spectrum is identified as well-distinguished peaks, the presence of which evidences the strong hybridization of Th and Ce metal centers with O orbitals. The sensitivity of the O K-edge to both f- and d-states in the absence of a core–hole on the metal ion results in an insightful overview of the electronic structure involved in the chemical bond. In particular, the large bandwidth of the Th 5f band as compared to the Ce 4f band is observed as a set of wider and more substantial set of peaks in the O K-edge, confirming the stronger hybridization of the former with O orbitals. The peak ascribed to the 5f band of ThO2 is found at higher energy than the 6d band, as predicted from DFT calculations on actinide dioxides. Here, to highlight the sensitivity and the potential use of the O K-edge for the characterization of ThO2-based systems, the sensitivity of the spectrum to structural changes such as lattice expansion and size reduction are calculated and discussed.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [5]; ORCiD logo [1]
  1. European Synchrotron Radiation Facility (ESRF), Grenoble (France); Helmholtz-Zentrum Dresden-Rossendorf (Germany)
  2. Univ. Montpellier (France)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Uppsala Univ. (Sweden)
  5. European Synchrotron Radiation Facility (ESRF), Grenoble (France)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; European Research Council (ERC); Swedish Research Council (SRC)
OSTI Identifier:
1969344
Grant/Contract Number:  
AC02-05CH11231; 759696; 2017-06465
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry. C
Additional Journal Information:
Journal Volume: 127; Journal Issue: 6; Journal ID: ISSN 1932-7447
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; absorption; actinides; energy; nanoparticles; x-ray absorption near edge spectroscopy

Citation Formats

Amidani, Lucia, Dumas, Thomas, Shuh, David K., Butorin, Sergei M., Sahle, Christoph J., Longo, Alessandro, and Kvashnina, Kristina O. Oxygen K-Edge X-ray Absorption Spectra of ThO2 and CeO2: Experiment, Interpretation, and Structural Effects. United States: N. p., 2023. Web. doi:10.1021/acs.jpcc.2c07771.
Amidani, Lucia, Dumas, Thomas, Shuh, David K., Butorin, Sergei M., Sahle, Christoph J., Longo, Alessandro, & Kvashnina, Kristina O. Oxygen K-Edge X-ray Absorption Spectra of ThO2 and CeO2: Experiment, Interpretation, and Structural Effects. United States. https://doi.org/10.1021/acs.jpcc.2c07771
Amidani, Lucia, Dumas, Thomas, Shuh, David K., Butorin, Sergei M., Sahle, Christoph J., Longo, Alessandro, and Kvashnina, Kristina O. Wed . "Oxygen K-Edge X-ray Absorption Spectra of ThO2 and CeO2: Experiment, Interpretation, and Structural Effects". United States. https://doi.org/10.1021/acs.jpcc.2c07771. https://www.osti.gov/servlets/purl/1969344.
@article{osti_1969344,
title = {Oxygen K-Edge X-ray Absorption Spectra of ThO2 and CeO2: Experiment, Interpretation, and Structural Effects},
author = {Amidani, Lucia and Dumas, Thomas and Shuh, David K. and Butorin, Sergei M. and Sahle, Christoph J. and Longo, Alessandro and Kvashnina, Kristina O.},
abstractNote = {Experimental oxygen K-edge spectra of ThO2 and CeO2 are presented and interpreted based on density functional theory (DFT). The contribution of d and f orbitals to the O K-edge spectrum is identified as well-distinguished peaks, the presence of which evidences the strong hybridization of Th and Ce metal centers with O orbitals. The sensitivity of the O K-edge to both f- and d-states in the absence of a core–hole on the metal ion results in an insightful overview of the electronic structure involved in the chemical bond. In particular, the large bandwidth of the Th 5f band as compared to the Ce 4f band is observed as a set of wider and more substantial set of peaks in the O K-edge, confirming the stronger hybridization of the former with O orbitals. The peak ascribed to the 5f band of ThO2 is found at higher energy than the 6d band, as predicted from DFT calculations on actinide dioxides. Here, to highlight the sensitivity and the potential use of the O K-edge for the characterization of ThO2-based systems, the sensitivity of the spectrum to structural changes such as lattice expansion and size reduction are calculated and discussed.},
doi = {10.1021/acs.jpcc.2c07771},
journal = {Journal of Physical Chemistry. C},
number = 6,
volume = 127,
place = {United States},
year = {Wed Feb 08 00:00:00 EST 2023},
month = {Wed Feb 08 00:00:00 EST 2023}
}

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