X-ray photoelectron spectroscopic studies on oxidation behavior of nickel and iron aluminides under oxygen atmosphere at low pressures

Naofumi Ohtsu, Akiko Nomura, Masaoki Oku, Toetsu Shishido, Kazuaki Wagatsuma

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Oxidation behaviors of NiAl, Ni 3 Al, and FeAl under oxygen atmosphere at low pressures were studied by X-ray photoelectron spectroscopy (XPS). Clean surfaces of these aluminides were prepared by fracturing in an ultra high vacuum, and then the fractured surfaces were oxidized by exposing to high-purity oxygen at pressures up to 1.3 Pa without exposing to air. The oxides formed on NiAl and FeAl surfaces were Al 2 O 3 , whereas the oxide on Ni 3 Al was NiAl 2 O 4 . Aluminum, nickel, and iron on clean surfaces were oxidized even at a pressure of 1.3 × 10 -6 Pa. The oxidation evolves with an increase in the pressure of oxygen, and further oxidation of aluminum occurs prior to that of nickel or iron. The oxidation behaviors under such oxygen atmosphere were similar to those of the aluminides oxidized in air, and these behaviors could be predicted from thermodynamic consideration.

Original languageEnglish
Pages (from-to)5336-5341
Number of pages6
JournalApplied Surface Science
Volume254
Issue number17
DOIs
Publication statusPublished - 2008 Jun 30

Keywords

  • Nickel and iron aluminides
  • Oxidation behavior under oxygen atmosphere
  • X-ray photoelectron spectroscopy

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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