X-ray photoelectron spectroscopic studies on initial oxidation of iron and manganese mono-silicides

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

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Initial oxidation of iron and manganese mono-silicides (FeSi and MnSi) surfaces was studied by X-ray photoelectron spectroscopy (XPS). Clean surfaces of these silicides 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. For the clean FeSi surface, positive chemical shifts of the Fe 2p 3/2 and Si 2p peaks from elemental Fe and Si were 0.5 eV and 0.1 eV, respectively. For the clean MnSi surface, a negative chemical shift of the Si 2p peak from elemental Si was 0.1 eV. Iron on the FeSi surface was oxidized at an oxygen pressure of 1.3 Pa, whereas the silicon was oxidized under the pressure of 1.3 × 10 -6 Pa, indicating that oxidation of silicon occurred prior to that of iron. Manganese and silicon on the MnSi were simultaneously oxidized in the range from 1.3 × 10 -6 Pa to 1.3 × 10 -3 Pa; however, over the pressure of 1.3 Pa, the oxidation of manganese occurs prior to that of silicon. These oxidation behaviors at low oxygen pressures were similar to those of the FeSi and MnSi fractured in air.

Original languageEnglish
Pages (from-to)3288-3294
Number of pages7
JournalApplied Surface Science
Volume254
Issue number11
DOIs
Publication statusPublished - 2008 Mar 30

Keywords

  • Fracturing
  • Initial oxidation
  • Iron silicide
  • Manganese silicide
  • 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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