AVS 49th International Symposium
    Surface Science Wednesday Sessions
       Session SS2-WeA

Paper SS2-WeA3
Structural Analysis of Quasicrystalline Al-Pd-Mn using Angle-Resolved Low Energy Ion Scattering

Wednesday, November 6, 2002, 2:40 pm, Room C-110

Session: Structure and Chemistry at Metal Surfaces
Presenter: C.J. Jenks, Iowa State University, Ames Laboratory
Authors: C.J. Jenks, Iowa State University, Ames Laboratory
P.A. Thiel, Iowa State University, Ames Laboratory
A.R. Ross, Iowa State University, Ames Laboratory
T.A. Lograsso, Iowa State University, Ames Laboratory
J.A. Whaley, Sandia National Laboratories
B. Bastasz, Sandia National Laboratories
Correspondent: Click to Email
We have used angle-resolved low-energy ion scattering to examine the clean surface structure and composition under ultra-high vacuum conditions of a single grain of icosahedral Al@sub 71@Pd@sub 20@Mn@sub 9@ oriented with a five-fold axis perpendicular to the surface. Our results are consistent with the surface maintaining five-fold symmetry after sputtering followed by annealing at 800 K. We find that the topmost surface layer is > 85 atomic % aluminum. A predominant neighbor atom distance of 7.6 ± 0.5 Šand a nearest neighbor distance of 3.0 ± 0.1 Šis calculated from our results. Our results are consistent with previous low energy electron diffraction intensity versus voltage (LEED-IV) calculations, recently published scanning tunneling microscopy results and a bulk model of Al-Pd-Mn quasicrystals.