Demixing processes in AgPd superlattices

J. Dumont, R. Sporken, M. J. Verstraete, J. Ghijsen, X. Gonze

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The present scanning tunneling microscopy (STM) study describes the growth of silver-palladium heterostructures at room temperature, with ab initio simulations of ordered AgPd phases supporting the interpretation of STM images. First, the growth of Pd on an Ag(111) surface proceeds in a multilayer mode, leading to the formation of a columnar structure. Then, upon Ag deposition on this structure, Ag and Pd partially mix and form a two-dimensional AgPd alloy on top of the columns. Finally, an atomically flat Ag(111) surface is restored, and two-dimensional growth continues. An interpretation of this peculiar growth mode including interfacial alloying is proposed based on thermodynamic and kinetic arguments.

Original languageEnglish
Article number315002
JournalJournal of Physics Condensed Matter
Volume21
Issue number31
DOIs
Publication statusPublished - 2009
Externally publishedYes

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