Sapphire (0001) surface, clean and with d-metal overlayers

Authors
Verdozzi, C Jennison, DR Schultz, PA Sears, MP
Citation
C. Verdozzi et al., Sapphire (0001) surface, clean and with d-metal overlayers, PHYS REV L, 82(4), 1999, pp. 799-802
Citations number
38
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
82
Issue
4
Year of publication
1999
Pages
799 - 802
Database
ISI
SICI code
0031-9007(19990125)82:4<799:S(SCAW>2.0.ZU;2-6
Abstract
We present local density-functional results for structural and electronic p roperties of Al2O3(0001), clean and with Pt and Ag adsorption. Significant surface relaxations penetrate to the third oxygen layer, 5.2 Angstrom below the surface. The dominant mechanism of metal adhesion is polarization and is relatively weak (similar or equal to 0.4 and 0.6 eV/atom for Ag and Pt, respectively); however, isolated metal atoms bind up to 5X as strongly with an ionic bond induced by the surface Madelung potential.