Determination of Ce4+/Ce3+ in electron-beam-damaged CeO2 by electron energy-loss spectroscopy

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Abstract

We followed the reduction of Ce4+ in CeO2 by observing changes in the shape of the Ce M4,5 edge by parallel electron energy-loss spectroscopy with a transmission electron microscope. The energy-loss near-edge structure of the beam-damaged CeO2 exhibits Ce M4,5 and O K-edge shapes that are consistent with reduction to a Ce3+ oxide. During the damage process the spectrum of CeO2 changes as follows: (a) decreases in energies of the M5 and M4 maxima; (b) changes in shape of the near-edge structure; (c) inversion of the M5 to M4 branching ratio; and (d) increase in the M5 to M4 area ratio. We simulated M4,5 edges of damaged CeO2 with a linear combination of Ce4+ and Ce3+ spectra and observed no intermediate oxidation states.

Original languageEnglish (US)
Pages (from-to)1943-1947
Number of pages5
JournalJournal of Physics and Chemistry of Solids
Volume60
Issue number12
DOIs
StatePublished - Dec 1999

Keywords

  • A. Oxides
  • C. Electron energy loss spectroscopy (EELS)
  • D. Radiation damage

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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