AES/XPS studies of oxidized R2Fe4B alloys

M. A. Langell, Y. G. Ren, D. J. Sellmyer

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Auger and X-ray photoelectron spectroscopies have been used to study the compositional and chemical nature of air-exposed R2Fe14B (R = Y, Nd and Gd) magnet alloys. Rare earth segregation correlates with the extent of surface oxidation and moderately oxidized surfaces show either stoichiometric rare earth concentrations or slight enrichment over near-surface values while heavily oxidized surfaces show rare earth depletion. The depleted surfaces contain significant amounts of iron oxides and it is proposed that, after initial oxidation of the near-surface rare-earth component, iron segregates to the surface driven by the formation of iron oxides. Boron segregation is also observed, although migration results in alloy-like surface boron species. However, once at the surface, boron oxidation is possible and boron oxides are identified by their characteristic 171 eV AES signal. Preferential sputtering of the boron component prevents meaningful depth analysis of this component of the rare-earth alloys.

Original languageEnglish (US)
Pages (from-to)213-222
Number of pages10
JournalJournal of Magnetism and Magnetic Materials
Volume82
Issue number2-3
DOIs
StatePublished - Dec 1989

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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