Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 12, Issue 26, Pages 7251-7257Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b923690b
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The Schottky defects at both the. at MgO(001) surface and the monatomic-step edge have been investigated by equilibrium molecular dynamics simulations. The formation enthalpy as a function of the distance between the Mg and O vacancies that form a Schottky defect have been calculated and discussed. We conclude that a step edge is a stable location for a vacancy. The migration mechanism has been elucidated and an intermediate state has been identified. The associated activation enthalpies have been determined in the 700-1100 K temperature range. Both magnesium and oxygen vacancies at the surface are very mobile and can play a role during the crystal growth.
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