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Oxidation of a depleted uranium-5 wt. % molybdenum (U-5Mo) alloy in UHV by AES and XPS

Bacon, Simon R, Brierley, Martin and Watts, John F (2019) Oxidation of a depleted uranium-5 wt. % molybdenum (U-5Mo) alloy in UHV by AES and XPS Surface and Interface Analysis.

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Oxidation of a depleted uranium-5 wt. % molybdenum (U-5Mo) alloy in UHV by AES and XPS.pdf - Accepted version Manuscript
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Abstract

Early stage oxidation of a dilute depleted uranium-molybdenum alloy was analysed in situ under UHV conditions by AES and XPS. At the equivalent of less than 300 ns at 1 atm O2, U-5Mo oxidises to form stoichiometric UO2. No molybdenum oxidation is observed. After an oxygen dose of approximately 39 L, the oxide layer approached a limiting thickness of approximately 2.4 nm. The oxidation kinetics followed a logarithmic rate law, with the best fit to the experimental data for the oxide thickness, d, being given by d = 1.26 log(0.12t + 0.56). Changes in oxygen KLL and 1s peak positions associated with transformation from chemisorbed oxygen to metal oxide were observed at similar oxygen doses of 2.3 and 2.6 L O2 by AES and XPS respectively, which opens up the possibility of using well characterised XPS chemical information to inform Auger peak shifts.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
NameEmailORCID
Bacon, Simon Rs.bacon@surrey.ac.uk
Brierley, Martin
Watts, John FJ.Watts@surrey.ac.uk
Date : 27 May 2019
Funders : Engineering and Physical Sciences Research Council (EPSRC)
DOI : /10.1002/sia.6659
Copyright Disclaimer : This is the peer reviewed version of the following article: Bacon SR, Brierley M, Baker MA, Watts JF. Oxidation of a depleted uranium‐5 wt% molybdenum (U‐5Mo) alloy in UHV by AES and XPS. Surf Interface Anal. 2019;51:849–856., which has been published in final form at https://doi.org/10.1002/sia.6659. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving
Uncontrolled Keywords : Uranium; Molybdenum; AES; XPS; Oxidation; Corrosion
Related URLs :
Depositing User : Clive Harris
Date Deposited : 17 May 2019 12:42
Last Modified : 13 Dec 2019 12:31
URI: http://epubs.surrey.ac.uk/id/eprint/851855

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