Bulk-surface vacancy exchange on Pt(111)

Poelsema, Bene; Hannon, J. B.; Bartelt, N. C.; Kellogg, G. L.
April 2004
Applied Physics Letters;4/5/2004, Vol. 84 Issue 14, p2551
Academic Journal
We have used low-energy electron microscopy to study atomic exchange between the bulk and the (111) surface of Pt above 1100 K. We find that the area of two-dimensional surface islands increases when the temperature is raised and decreases when the temperature is lowered, suggesting that thermal bulk vacancies are created at the surface. By measuring the temperature dependence of the change in area of the islands, we determine a Pt bulk vacancy formation energy of 1.54±0.07 eV, consistent with previous measurements and calculations. © 2004 American Institute of Physics.


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