XPS study of ion irradiated and unirradiated CeO 2 bulk and thin film samples

Maslakov, Konstantin I. and Teterin, Yury A. and Popel, Aleksej J. and Yu. Teterin, Anton and Ivanov, Kirill E. and Kalmykov, Stepan N. and Petrov, Vladimir G. and Petrov, Peter K. and Farnan, Ian (2018) XPS study of ion irradiated and unirradiated CeO 2 bulk and thin film samples. Applied Surface Science, 448. pp. 154-162. ISSN 0169-4332 DOI https://doi.org/10.1016/j.apsusc.2018.04.077

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Abstract

This work considers the effect of fission-energy ion irradiation on the electronic structure at the surface of bulk and thin film samples of CeO2 as a simulant for UO2 nuclear fuel. For this purpose, thin films of CeO2 grown on Si substrates and bulk CeO2 samples were irradiated by Xe ions (92 MeV, 4.8 × 1015 ions/cm2) to simulate the fission damage that occurs within nuclear fuels. The irradiated and unirradiated samples were characterised by X-ray photoelectron spectroscopy. A technique of the quantitative evaluation of cerium ionic composition on the surface of the samples has been successfully applied to the obtained XPS spectra. This technique is based on the intensity of only one of the reliably identifiable high-energy peak at 916.6 eV in the Ce 3d XPS spectra. As-produced samples were found to contain mostly the Ce4+ ions with a small fraction of Ce3+ ions formed on the surface in the air or under X-rays. The core-electron XPS structure of CeO2 was associated with the complex final state with vacancies (holes) resulting from the photoemission of an inner electron. The Xe ion irradiation was found to increase the Ce3+ content in the samples of CeO2, with the thin films being more sensitive than the bulks samples.

Item Type:	Article
Uncontrolled Keywords:	2018AREP; IA74
Subjects:	03 - Mineral Sciences
Divisions:	03 - Mineral Sciences 07 - Gold Open Access
Journal or Publication Title:	Applied Surface Science
Volume:	448
Page Range:	pp. 154-162
Identification Number:	https://doi.org/10.1016/j.apsusc.2018.04.077
Depositing User:	Sarah Humbert
Date Deposited:	12 Apr 2018 17:31
Last Modified:	10 Mar 2021 23:14
URI:	http://eprints.esc.cam.ac.uk/id/eprint/4251

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