The Atomic Structure of the UO2 (111) Surface and the Effects of Additional Surface Oxygen Studied by Elevated Temperature STM-Reference-Cited by-同舟云学术

The Atomic Structure of the UO2 (111) Surface and the Effects of Additional Surface Oxygen Studied by Elevated Temperature STM

Published:1998-02 Issue:01 Volume:05 Page:315-320
ISSN:0218-625X
Container-title:Surface Review and Letters
language:en
Short-container-title:Surf. Rev. Lett.

Author:

Muggelberg C.¹,Castell M. R.¹,Briggs G. A. D.¹,Goddard D. T.²

Affiliation:

1. Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK

2. Company Research Laboratory, British Nuclear Fuels plc., Springfields Works, Salwick, Preston, Lancashire PR4 OXJ, UK

Abstract

The structure of the UO 2+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 stoichiometric UO 2 (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 [Formula: see text] superstructure. The other terrace type observed on top of the UO 2+x (111) surface is thought to be a phase of a higher uranium oxide which has grown epitaxially.

Publisher

World Scientific Pub Co Pte Lt

Subject

Materials Chemistry,Surfaces, Coatings and Films,Surfaces and Interfaces,Condensed Matter Physics

Link

https://www.worldscientific.com/doi/pdf/10.1142/S0218625X9800058X

Reference16 articles.

1. Systematic Analysis of Core Photoemission Spectra for Actinide Di-Oxides and Rare-Earth Sesqui-Oxides

2. X-ray photoelectron studies of thorium, uranium, and their dioxides

3. Electronic structure and Coulomb correlation energy in UO2 single crystal

4. XPS evidence for 5f bonding participation in UO2

5. Electrical Conductivity of Uranium Dioxide

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