ChemRxiv
These are preliminary reports that have not been peer-reviewed. They should not be regarded as conclusive, guide clinical practice/health-related behavior, or be reported in news media as established information. For more information, please see our FAQs.
1/1
0/0

Noncollinear Relativistic DFT+U Calculations of Actinide Dioxide Surfaces

preprint
submitted on 03.10.2018 and posted on 03.10.2018 by James Pegg, Ashley E. Shields, Mark T. Storr, David Scanlon, Nora De Leeuw
A noncollinear relativistic PBEsol+U study of the low-index actinide dioxides (AnO2, An = U, Np, Pu) surfaces has been conducted. The surface properties of the AnO2 have been investigated and the importance of the reorientation of magnetic vectors relative to the plane of the surface is highlighted. In collinear nonrelativistic surface models, the orientation of the magnetic moments is often ignored; however, the use of noncollinear relativistic methods is key to the design of reliable computational models. The ionic relaxation of each surface is shown to be confined to the first three monolayers and we have explored the configurations of the terminal oxygen ions on the reconstructed (001) surface. The reconstructed (001) surfaces are ordered as (001)αβ < (001)α < (001)β in terms of energetics. Electrostatic potential isosurface and scanning tunneling microscopy images have also been calculated. By considering the energetics of the low-index AnO2 surfaces, an octahedral Wulff crystal morphology has been calculated.

Funding

UK Engineering & Physical Science Research Council (EPSRC) (Grant nos. EP/G036675 and EP/K016288) and the Atomic Weapons Establishment (AWE).

History

Email Address of Submitting Author

pegg.james.t@gmail.com

Institution

University College London

Country

United Kingdom

ORCID For Submitting Author

0000-0002-6743-8651

Declaration of Conflict of Interest

No Conflicts of Interest

Version Notes

Initial Version

Exports