Auger studies of the effect of temperature and oxygen exposure on the surface composition of Ni-1%Th alloy

C. Berry*, D. Majumdar, Y. W. Chung

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Auger electron spectroscopy studies of a clean Ni-1at%Th alloy surface were made in the temperature range of 700-900°C. Results show the segregation of thorium to the surface of the alloy with a heat of segregation of -18.8 ± 4.4 kJ/mole. Calculations based on the existing unified theory of segregation in binary alloys yield a much larger value for the heat of segregation. Possible reasons for this discrepancy are discussed. Oxygen exposure at 250°C resulted in the accelerated segregation of thorium to the alloy surface at exposures less than 20 L, with the thorium surface concentration increasing at a much slower rate beyond 20 L. This segregation may play an important role in the methanation activity of thorium-nickel alloys.

Original languageEnglish (US)
Pages (from-to)293-302
Number of pages10
JournalSurface Science
Volume94
Issue number2-3
DOIs
StatePublished - Apr 2 1980

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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