Advertisement

Atomic Resolution Study of Structural Rearrangements in Metal Clusters

  • Amanda K. Petford-Long
  • N. J. Long
  • David J. Smith
  • L. R. Wallenberg
  • J.-O. Bovin

Abstract

Dynamic events in small particles of Au, Pt, Rh and Ru have been observed inside the electron microscope. Depending on the particle size and the beam current density, the small clusters undergo structural rearrangements, with rapid changes in orientation and shape with respect to the beam direction. Various forms of surface activity have been recorded including atom hopping, twinning and atomic "clouds" above some surfaces. In a fraction of a second, a 2.5nm ruthenium crystal changed its internal structure from cubic-close-packing to hexagonal-close-packing. Twinning was comparatively common, even in particles with diameters of 2nm or less. From hot stage observations the speed of structural rearrangements was found to be temperature dependent.

Keywords

Structural Rearrangement Incident Electron Beam Beam Current Density Substrate Film Support Film 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    R. Wallenberg, J.-O. Bovin and D.J. Smith, Naturwiss., 72: 539 (1985)ADSCrossRefGoogle Scholar
  2. 2.
    J.-O. Bovin, R. Wallenberg and D.J. Smith, Nature, 317: 47 (1985).ADSCrossRefGoogle Scholar
  3. 3.
    D.J. Smith, A.K. Petford-Long, L.R. Wallenberg and J.-O. Bovin. Science, 233: 872 (1986).ADSCrossRefGoogle Scholar
  4. 4.
    S. Iijima and T. Ichihashi, Phys. Rev. Lett., 56: 616 (1986).ADSCrossRefGoogle Scholar
  5. 5.
    S. Iijima, J. Electron Microsc., 34: 249 (1986).Google Scholar
  6. 6.
    L.R. Wallenberg, J.-O. Bovin, A.K. Petford-Long and D.J. Smith, Ultramicroscopy, 1986 (in press).Google Scholar
  7. 8.
    R. Wallenberg, J.-O. Bovin and G. Schmid, Surf. Sci., 156: 256 (1985).ADSCrossRefGoogle Scholar
  8. 8.
    Ph. Buffat and J.-P. Borel, Phys. Rev. A, 13: 2287 (1976).ADSCrossRefGoogle Scholar
  9. 9.
    J. Ross and R.P. Andres, Surf. Sci., 106: 11 (1980).ADSCrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1987

Authors and Affiliations

  • Amanda K. Petford-Long
    • 1
  • N. J. Long
    • 1
  • David J. Smith
    • 2
  • L. R. Wallenberg
    • 3
  • J.-O. Bovin
    • 3
  1. 1.Center for Solid State ScienceArizona State UniversityTempeUSA
  2. 2.Inorganic Chemistry 2, Chemical CenterUniversity of LundLundSweden
  3. 3.Department of PhysicsArizona State UniversityUSA

Personalised recommendations