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The segregation kinetics of carbon to a Mo(100) surface: deviations from a parabolic time law due to subsurface enrichment

Authors
Journal
Journal of Alloys and Compounds
0925-8388
Publisher
Elsevier
Publication Date
Volume
235
Issue
1
Identifiers
DOI: 10.1016/0925-8388(95)02083-7
Keywords
  • Diffusion Of C In Mo
  • Segregation Kinetics
  • Auger Electron Spectroscopy

Abstract

Abstract The segregation kinetics of carbon to a Mo(100) surface is investigated by Auger electron spectroscopy (AES) in the temperature range from 1018 to 1528 K. Strong deviations from a parabolic time law are observed in the primary stages of the experiments; this is more pronounced the lower the temperature. Reaction desorptions from a carburized, annealed surface with additionally adsorbed oxygen show that a multilayer enrichment occurs, markedly influencing the segregation kinetics up to temperatures of about 1400 K. The initially delayed segregation kinetics observed by the AES measurements are simulated by a simple model calculation which takes account of a multilayer enrichment which lowers the mobility of carbon within the C-enriched outermost layers. This is discussed in connection with non-parabolic segregation kinetics reported in the literature. Applying this model allows us to determine the parameters for the volume diffusion of C in Mo quite accurately, despite the deviations from a parabolic time law.

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