Ostwald ripening of Pd particles on the (101̄2̄) surface of sapphire

Á Imre, E. Gontier-Moya, D. Beke, I. Szabó, G. Erdélyi

Research output: Contribution to journalArticle

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Abstract

Morphological changes of small Pd particles on the (101̄2̄) surface of α-Al2O3 single crystal were investigated by Auger electron spectroscopy in the temperature range 833-923 K. It was shown that practically there was no decrease of the effective thickness during heat treatments under 6×10-9 mbar. Supposing that the observed change in the Auger intensities is due to the surface Ostwald ripening, it was established that the process was controlled by surface diffusion. It was shown that in this case, taking into account the dissolution of small particles, the normalized Auger intensity is inversely proportional to the normalized average radius. The surface mass transport diffusion coefficients were determined and they were in the range 10-15-10-17 m2 s-1 in the investigated temperature interval. Their temperature dependence can be given as D′s = (6-5.93+486)×10-5 exp{[-(203±30) kJ mol-1]/RT} m2 s-1.

Original languageEnglish
Pages (from-to)133-139
Number of pages7
JournalSurface Science
Volume441
Issue number1
DOIs
Publication statusPublished - Oct 20 1999

Fingerprint

Ostwald ripening
Aluminum Oxide
Sapphire
sapphire
Surface diffusion
Auger electron spectroscopy
surface diffusion
Temperature
Auger spectroscopy
electron spectroscopy
dissolving
Dissolution
heat treatment
Mass transfer
diffusion coefficient
Heat treatment
Single crystals
intervals
temperature dependence
radii

ASJC Scopus subject areas

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

Cite this

Ostwald ripening of Pd particles on the (101̄2̄) surface of sapphire. / Imre, Á; Gontier-Moya, E.; Beke, D.; Szabó, I.; Erdélyi, G.

In: Surface Science, Vol. 441, No. 1, 20.10.1999, p. 133-139.

Research output: Contribution to journalArticle

Imre, Á ; Gontier-Moya, E. ; Beke, D. ; Szabó, I. ; Erdélyi, G. / Ostwald ripening of Pd particles on the (101̄2̄) surface of sapphire. In: Surface Science. 1999 ; Vol. 441, No. 1. pp. 133-139.
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