Determination of surface diffusion parameters of Pd on sapphire from SEM measurements of morphological changes of beaded films

Á Imre, D. Beke

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5 Citations (Scopus)

Abstract

Changes of the effective thickness and shift of the boundary of Pd discontinuous films on the (1012) surface of α-Al2O3 were investigated by scanning electron microscopy between 1313-1423 K and under 1.5 × 10-6 rnbar. The morphological changes were caused by the evaporation of Pd from the surface of sapphire. From the shift of the boundary as well as from the decrease of the effective thickness, the temperature dependence of the surface diffusion length, λs, and mass transport diffusion coefficient, D′s, has been determined as: λs = (3.6+27-3.19) × 10-10 exp{ [(87 ± 25) KJ mol-1]/RT } m. D′s = (7.9+132-7.46) × 10-9 exp { [-(204 ± 33) KJ mol-1]/RT } m2 s-1. These activation energies are consistent with our previous results determined by Auger electron spectroscopy of diminution (caused by evaporation) and Ostwald ripening of a Pd discontinuous film, containing smaller Pd particles.

Original languageEnglish
Pages (from-to)357-360
Number of pages4
JournalApplied Physics A: Materials Science and Processing
Volume72
Issue number3
Publication statusPublished - Mar 2001

Fingerprint

Surface diffusion
Aluminum Oxide
surface diffusion
Sapphire
Evaporation
sapphire
evaporation
Ostwald ripening
Scanning electron microscopy
scanning electron microscopy
shift
Auger electron spectroscopy
diffusion length
Auger spectroscopy
electron spectroscopy
Mass transfer
diffusion coefficient
Activation energy
activation energy
temperature dependence

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy (miscellaneous)

Cite this

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title = "Determination of surface diffusion parameters of Pd on sapphire from SEM measurements of morphological changes of beaded films",
abstract = "Changes of the effective thickness and shift of the boundary of Pd discontinuous films on the (1012) surface of α-Al2O3 were investigated by scanning electron microscopy between 1313-1423 K and under 1.5 × 10-6 rnbar. The morphological changes were caused by the evaporation of Pd from the surface of sapphire. From the shift of the boundary as well as from the decrease of the effective thickness, the temperature dependence of the surface diffusion length, λs, and mass transport diffusion coefficient, D′s, has been determined as: λs = (3.6+27-3.19) × 10-10 exp{ [(87 ± 25) KJ mol-1]/RT } m. D′s = (7.9+132-7.46) × 10-9 exp { [-(204 ± 33) KJ mol-1]/RT } m2 s-1. These activation energies are consistent with our previous results determined by Auger electron spectroscopy of diminution (caused by evaporation) and Ostwald ripening of a Pd discontinuous film, containing smaller Pd particles.",
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T1 - Determination of surface diffusion parameters of Pd on sapphire from SEM measurements of morphological changes of beaded films

AU - Imre, Á

AU - Beke, D.

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N2 - Changes of the effective thickness and shift of the boundary of Pd discontinuous films on the (1012) surface of α-Al2O3 were investigated by scanning electron microscopy between 1313-1423 K and under 1.5 × 10-6 rnbar. The morphological changes were caused by the evaporation of Pd from the surface of sapphire. From the shift of the boundary as well as from the decrease of the effective thickness, the temperature dependence of the surface diffusion length, λs, and mass transport diffusion coefficient, D′s, has been determined as: λs = (3.6+27-3.19) × 10-10 exp{ [(87 ± 25) KJ mol-1]/RT } m. D′s = (7.9+132-7.46) × 10-9 exp { [-(204 ± 33) KJ mol-1]/RT } m2 s-1. These activation energies are consistent with our previous results determined by Auger electron spectroscopy of diminution (caused by evaporation) and Ostwald ripening of a Pd discontinuous film, containing smaller Pd particles.

AB - Changes of the effective thickness and shift of the boundary of Pd discontinuous films on the (1012) surface of α-Al2O3 were investigated by scanning electron microscopy between 1313-1423 K and under 1.5 × 10-6 rnbar. The morphological changes were caused by the evaporation of Pd from the surface of sapphire. From the shift of the boundary as well as from the decrease of the effective thickness, the temperature dependence of the surface diffusion length, λs, and mass transport diffusion coefficient, D′s, has been determined as: λs = (3.6+27-3.19) × 10-10 exp{ [(87 ± 25) KJ mol-1]/RT } m. D′s = (7.9+132-7.46) × 10-9 exp { [-(204 ± 33) KJ mol-1]/RT } m2 s-1. These activation energies are consistent with our previous results determined by Auger electron spectroscopy of diminution (caused by evaporation) and Ostwald ripening of a Pd discontinuous film, containing smaller Pd particles.

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