We present local density-functional results for structural and electronic properties of Al₂O₃(0001), clean and with Pt and Ag adsorption. Significant surface relaxations penetrate to the third oxygen layer, 5.2 {} below the surface. The dominant mechanism of metal adhesion is polarization and is relatively weak ( 0.4 and 0.6 eV/atom for Ag and Pt, respectively); however, isolated metal atoms bind up to 5× as strongly with an ionic bond induced by the surface Madelung potential.
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Verdozzi et al. (1999) studied this question.
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