Diffusion of individual Pt atoms on single-crystal surfaces of rhodium
- Sandia National Laboratories, Albuquerque, New Mexico 87112 (United States)
The diffusion of individual Pt atoms on five low-index crystal planes of Rh has been investigated by field-ion microscopy. The activation energy of surface diffusion is found to depend strongly on the crystal plane and to increase in the order of (111)[lt](311)[lt](110)[lt](331)[lt](100). It ranges from below 0.22 eV on Rh(111) to 0.92 eV on Rh(100). The diffusion mechanism on all surfaces is site-to-site hopping, with the exception of Rh(110), where convincing evidence for exchange displacements is obtained. The reflection barrier against migration off the plane edge also exhibits a strong structure sensitivity, from a large reflection on Rh(311) to essentially none on Rh(100) and Rh(331). The results are compared with previous field-ion-microscope studies of self-diffusion on Rh and Pt.
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5968026
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 48:15; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
Similar Records
The structure and reactivity of adsorbates on stepped Rh and Pt surfaces investigated by LEED, HREELS, TPD, XPS and STM
Surface self-diffusion on Pt(001) by an atomic exchange mechanism
Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACTIVATION ENERGY
CRYSTAL FACES
CRYSTALS
DIFFUSION
ELEMENTS
ENERGY
ION MICROSCOPY
METALS
MICROSCOPY
MONOCRYSTALS
PLATINUM
PLATINUM METALS
RHODIUM
SURFACE PROPERTIES
TEMPERATURE RANGE
TEMPERATURE RANGE 0065-0273 K
TRANSITION ELEMENTS