The formation of a surface alloy for Ag/Ir(111) ultrathin films

W. H. Chen, S. C. Wang, Y. W. Tseng, D. C. Tsai, J. S. Tsay

研究成果: 雜誌貢獻文章同行評審

6 引文 斯高帕斯(Scopus)

摘要

At temperatures below the occurrence of thermal desorption of Ag atoms, the compositional and structural changes of Ag/Ir(111) films are investigated. From depth profiling measurements, we demonstrate that a small amount of silver atoms intermixes with iridium atoms in the interfacial layer to form a surface alloy. The three-dimensional rearrangement of iridium atoms by the ascending motion and dissociation at the steps provides an opportunity for silver adatoms incorporating into the Ir(111) surface. As the sample temperature increases for Ag/Ir(111), the logarithm of the intensity of the diffraction spot descends with an upswing around 450 K as revealed using low-energy electron diffraction technique. This shows an enhanced structural ordering by thermally annealing for Ag/Ir(111) films. The morphological change of the Ag/Ir(111) system coincides with the increasing mobility in a three-dimensional configuration of iridium atoms.

原文英語
頁(從 - 到)2045-2049
頁數5
期刊Surface Science
605
發行號23-24
DOIs
出版狀態已發佈 - 2011 十二月 1

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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