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Diffusion kinetics in the Pd/Cu(001) surface alloy.

M L Grant1, B S Swartzentruber, N C Bartelt

  • 1Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213-3890, USA.

Physical Review Letters
|June 1, 2001
PubMed
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We tracked individual palladium (Pd) atoms on a copper (Cu) surface to understand diffusion. Palladium atoms move via a vacancy-exchange mechanism, with a measured activation energy of 0.88 eV.

Area of Science:

  • Surface Science
  • Materials Science
  • Physical Chemistry

Background:

  • Surface alloys are crucial in catalysis and electronics.
  • Understanding atom diffusion on surfaces is key to controlling material properties.

Purpose of the Study:

  • To investigate the diffusion mechanism of palladium (Pd) atoms in a Pd/Cu(001) surface alloy.
  • To determine the activation energy for Pd diffusion on this surface alloy.

Main Methods:

  • Atom-tracking scanning tunneling microscopy (STM) was employed to monitor individual Pd atom movement.
  • Temperature-dependent diffusion studies were conducted.
  • Ab initio calculations were performed for theoretical validation.

Main Results:

Related Experiment Videos

  • Palladium atoms were observed to diffuse via a vacancy-exchange mechanism.
  • The measured activation energy for incorporated Pd atom diffusion was 0.88 eV.
  • This experimental value closely matched the calculated ab initio energy of 0.94 eV.

Conclusions:

  • The vacancy-exchange mechanism governs Pd diffusion in the Pd/Cu(001) surface alloy.
  • The study provides accurate experimental and theoretical data on surface diffusion energetics.