Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5425854 | Surface Science | 2007 | 7 Pages |
Abstract
The formation and stability of Cu, Ag and Au-induced c(2Â ÃÂ 2) alloys at the Mo(1Â 0Â 0) and W(1Â 0Â 0) surfaces have been investigated with low-energy electron microscopy and diffraction. The ordered alloys transform to disordered overlayer structures at elevated temperature. Comparison of the transformation temperatures with energetics obtained from first principles calculations reveals the vibrational entropic contribution to the system free energy that defines alloy thermal stability. Effective Debye temperatures for metal adatoms are determined that exhibit the expected mass and bond strength dependence.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
K.L. Man, Y.J. Feng, C.T. Chan, M.S. Altman,