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LEEM investigation of the faceting of the Pt covered W(111) surface

Authors
Journal
Surface Science
0039-6028
Publisher
Elsevier
Publication Date
Volume
432
Identifiers
DOI: 10.1016/s0039-6028(99)00543-9
Keywords
  • Faceting
  • Growth
  • Low-Energy Electron Microscopy (Leem)
  • Nucleation
  • Platinum
  • Surface Diffusion
  • Tungsten

Abstract

Abstract A low energy electron microscope has been used to investigate the faceting of W(111) as induced by Pt. The atomically rough W(111) surface, when fully covered with a monolayer film of Pt and annealed to temperatures higher than ∼750 K, experiences a significant morphological restructuring: the initially planar surface undergoes a faceting transition and forms three-sided pyramids with {211} faces. The experiments demonstrate the capability of low energy electron microscopy for imaging both the fully and the partially faceted surface. In addition, we have observed the formation of the facets in real time, when Pt is dosed onto the heated surface. We find that the transition from planar surface, to partially faceted surface, and to fully faceted surface proceeds through the nucleation and growth of spatially separated faceted regions.

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