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[ Last edited by lvzhu2007 on 2008-4-26 at 16:55 ]
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The metal¨Cmetal bond lengths in elemental Ag and Au are very similar (2.889 and 2.884 Å, respectively), so there is a negligible strain-induced driving force to induce segregation. The surface energy of Ag (1.25 J m−2) is less than that of Au (1.50 J m−2), which favors surface-enrichment by Ag. The cohesive energy of Au (3.81 eV atom¨C1) is greater than that of Ag (2.95 eV atom¨C1), which indicates that the metal¨Cmetal bond strengths are in the order Au¨CAu > Ag¨CAg, also favoring core-enrichment by Au. However, these theoretical considerations ignore the size-dependent complexity arising from electronic effects.

http://dx.doi.org/10.1016/j.actamat.2008.01.048
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