DIFFUSION OF PD-ADATOMS AND STABILITY OF PD-OVERLAYERS ON THE (011) SURFACE OF PT

Field-ion microscopy has been used to examine the migration of individual Pd atoms and the stability of Pd overlayers on the (011) surface of Pt. Pd atoms are found to migrate within the [011BAR] surface channels in the temperature range 207-235 K with an activation energy of 0.58+/-0.05 eV. Cross-channel displacements are not observed. Clusters of Pd atoms on Pt (011) form stable (1 X 1) structures at temperatures below 300 K and do not reconstruct to the "missing-row" structure. Pd adatoms deposited on top of (1 X 1) Pd overlayers are found to diffuse in channel at a temperature of 167 K.