Investigation of mass transfer surface self-diffusion on palladium

I. Beszeda, E. G. Gontier-Moya, D. Beke

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Growth of voids in thin palladium layers (8-20 nm) on alumina and silica substrates has been investigated by Auger electron spectroscopy and atomic force microscopy. Using the Brandon-Bradshaw's model, based on capillarity forces, the surface self-diffusion coefficients of palladium have been evaluated in the temperature range of 583-823 K. We have found that the results are independent of the substrate, in agreement with the assumption that the growth of voids is controlled by surface self-diffusion on the metal. The mass transfer surface self-diffusion coefficients are expressed by D s(m2/s)=1.1×10 -7exp[-97±13(kJ/mol)/RT]. These new results are compared with literature data. The experimental and theoretical values for intrinsic diffusion coefficients on oriented surfaces disclose much lower activation energies than that found in the present work, and the differences are related to the formation energy of the defects responsible for surface diffusion.

Original languageEnglish
Pages (from-to)229-238
Number of pages10
JournalSurface Science
Volume547
Issue number1-2
DOIs
Publication statusPublished - Dec 10 2003

Fingerprint

Palladium
surface diffusion
mass transfer
palladium
Mass transfer
diffusion coefficient
voids
Surface diffusion
Aluminum Oxide
Capillarity
energy of formation
Substrates
Auger electron spectroscopy
Silicon Dioxide
Auger spectroscopy
electron spectroscopy
Atomic force microscopy
Alumina
aluminum oxides
Activation energy

Keywords

  • Aluminum oxide
  • Atomic force microscopy
  • Auger electron spectroscopy
  • Metallic films
  • Palladium
  • Surface diffusion
  • Surface energy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Investigation of mass transfer surface self-diffusion on palladium. / Beszeda, I.; Gontier-Moya, E. G.; Beke, D.

In: Surface Science, Vol. 547, No. 1-2, 10.12.2003, p. 229-238.

Research output: Contribution to journalArticle

Beszeda, I. ; Gontier-Moya, E. G. ; Beke, D. / Investigation of mass transfer surface self-diffusion on palladium. In: Surface Science. 2003 ; Vol. 547, No. 1-2. pp. 229-238.
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