Title: Structure and stability of oxygen vacancies on sub-surface, terraces, and low-coordinated surface sites of MgO: an ab initio study
Authors: Pacchioni, G ×
Pescarmona, Paolo #
Issue Date: 1998
Publisher: Elsevier science bv
Series Title: Surface science vol:412-13 pages:657-671
Abstract: We have performed ab initio Hartree-Fock cluster model calculations on the electronic structure and properties of neutral and charged oxygen vacancies, the F color centers, at various sites of the MgO(001) surface. Sub-surface, surface, step, and corner sites have been considered. For each site we have determined the optimal structure, the relative stability of neutral versus charged vacancies, the formation energy, and, for the paramagnetic F+ centers, the spin distribution as given by the isotropic hyperfine coupling constants of the unpaired electron with the surrounding Mg2+ nuclear spin. The barrier for diffusion of oxygen ions in the presence of F2+ centers has been estimated for the migration from the sub-surface to the surface, from a terrace site to another terrace site, and from a step to a terrace site. (C) 1998 Elsevier Science B.V. All rights reserved.
ISSN: 0039-6028
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Centre for Surface Chemistry and Catalysis
× corresponding author
# (joint) last author

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