Auger electron spectroscopy of the kinetics of evaporation of palladium beaded films from sapphire substrate

A. Imre, E. Gontier-Moya, D. L. Beke, B. Ealet

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Abstract

Kinetics of morphological changes of beaded Pd film on the (1012) surface of sapphire were investigated by Auger electron spectroscopy in the temperature range of 1053-1083 K. It was found that the decrease of the effective thickness during heat treatments under 10-8 mbar was caused by evaporation from the surface of the substrate. Using the model developed by Kaganovskii and Beke we have established that the process is controlled by surface diffusion. It was shown that the evaporation rate of palladium adatoms from an alumina surface is given by Io = 1.45 x 1036 exp{-(393±46 kJ/mol)/RT}m-2s-1, and, on the basis of an estimation of the surface diffusion length, the effective surface diffusion coefficient D′s was evaluated: D′s = 1.2 x 104 exp{-(393±46 kJ/mol)/RT}m2s-1 .

Original languageEnglish
Pages (from-to)469-473
Number of pages5
JournalApplied Physics A: Materials Science and Processing
Volume67
Issue number4
DOIs
Publication statusPublished - jan. 1 1998

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ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

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