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Article
Terrace selection during equilibration at an icosahedral quasicrystal surface
Physical Review B
  • Barış Ünal, Iowa State University
  • Thomas A. Lograsso, Iowa State University
  • A. R. Ross, Iowa State University
  • Cynthia J. Jenks, Iowa State University
  • Patricia A. Thiel, Iowa State University
Document Type
Article
Publication Date
1-1-2005
DOI
10.1103/PhysRevB.71.165411
Abstract

We investigate the equilibration of a fivefold surface of the icosahedral Al‐Pd‐Mn quasicrystal at 900–915 and 925–950 K, using scanning tunneling microscopy. After annealing at the lower temperatures, there is a high density of shallow voids on some terraces but not on others; at 925–950 K, the void-rich terraces are much rarer. The terminations that are consumed by voids exhibit a distinctive local atomic configuration, called a “ring” by previous authors. Apparently, through growth and coalescence of the voids, a different termination becomes exposed on the host terraces, which also leads to a change in step heights at the edges of the terraces. We suggest that the shallow steps associated with the voids, and the ring configuration, signal a surface that is in an intermediate stage of structural equilibration.

Comments

This article is from Physical Review B 71, no. 16 (2005): 165411, doi:10.1103/PhysRevB.71.165411.

Copyright Owner
American Physical Society
Language
en
Date Available
June 26, 2013
File Format
application/pdf
Citation Information
Barış Ünal, Thomas A. Lograsso, A. R. Ross, Cynthia J. Jenks, et al.. "Terrace selection during equilibration at an icosahedral quasicrystal surface" Physical Review B Vol. 71 Iss. 16 (2005) p. 165411
Available at: http://works.bepress.com/thomas_lograsso/11/