Self-diffusion on Pd(111)
The barrier and prefactor for self-diffusion of Pd on Pd(111) are derived from scanning tunnelling investigations of the homoepitaxial growth of Pd/Pd(111). The barrier for diffusion is found to be 350 meV. This is the highest value observed so far for self-diffusion on a fcc(111) metal surface. Such exceptional behaviour has recently been predicted, as Pd(111) - unlike other fcc(111) transition metals - does not support an occupied free-electron like surface state. An exceptionally high prefactor of 6 X 10(x16)s-1 is observed, indicating a large entropic contribution to diffusion in accordance with the Meyer-Neldel compensation law.
Bibliographic Reference: Article: Surface Science 454-456 (2000) pp. 558-561
Availability: Surface Science (Journal)
Record Number: 200012728 / Last updated on: 2000-09-08
Original language: en
Available languages: en