The Atomic Structure of theUO2(111) Surface and the Effects of Additional Surface Oxygen Studied by Elevated Temperature STM

C. Muggelberg, M. R. Castell, G. A. D. Briggs and D. T. Goddard
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C. Muggelberg: Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK
M. R. Castell: Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK
G. A. D. Briggs: Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK
D. T. Goddard: Company Research Laboratory, British Nuclear Fuels plc., Springfields Works, Salwick, Preston, Lancashire PR4 OXJ, UK

Surface Review and Letters (SRL), 1998, vol. 05, issue 01, 315-320

Abstract: The structure of theUO2+x(111) surface has been investigated by elevated temperature STM. Images of atomic terraces reveal two different types of surface termination. One of them corresponds to the stoichiometricUO2(111) surface and can be resolved atomically in empty state images above ~ 1.6 V sample bias. The observed (1 × 1) ordering is thought to be due to uranium states because its occurrence corresponds to the bottom of the empty uranium 5f band. On these terraces mobile oxygen forms a local$(\sqrt{3}\times\sqrt{3})\rm{R}30^{\circ}$superstructure. The other terrace type observed on top of theUO2+x(111) surface is thought to be a phase of a higher uranium oxide which has grown epitaxially.

Date: 1998
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DOI: 10.1142/S0218625X9800058X

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