Stoichiometry and valence measurements of niobium oxides using electron energy-loss spectroscopy

M. J. Olszta, J. Wang, E. C. Dickey

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Qualitative and quantitative electron energy-loss spectroscopy analyses have been performed on niobium and stable niobium oxides (NbO, NbO2 and Nb2O5). At integration windows (Δ) greater than 75 eV, k-factor analysis can be used to distinguish between the stoichiometry of the three oxides within 5.7% error. As seen in other metal oxides, with increasing oxidation state the metal ionization edges shift to higher energies relative to the O-K edge. Normalized M2,3 white-line intensities show a strong correlation with 4d occupancy for each compound. The data are in correspondence with that observed in the literature for 4d transition metals using normalized L2,3 white lines. Lastly, a distinctive energy-loss near-edge, structure of the O-K edge was observed for each oxide, which could be used as a fingerprint for analysis of unknowns.

Original languageEnglish (US)
Pages (from-to)233-241
Number of pages9
JournalJournal of Microscopy
Volume224
Issue number3
DOIs
StatePublished - Dec 1 2006

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Electron Energy-Loss Spectroscopy
Niobium
Oxides
Metals
Dermatoglyphics
Statistical Factor Analysis

All Science Journal Classification (ASJC) codes

  • Pathology and Forensic Medicine
  • Histology

Cite this

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abstract = "Qualitative and quantitative electron energy-loss spectroscopy analyses have been performed on niobium and stable niobium oxides (NbO, NbO2 and Nb2O5). At integration windows (Δ) greater than 75 eV, k-factor analysis can be used to distinguish between the stoichiometry of the three oxides within 5.7{\%} error. As seen in other metal oxides, with increasing oxidation state the metal ionization edges shift to higher energies relative to the O-K edge. Normalized M2,3 white-line intensities show a strong correlation with 4d occupancy for each compound. The data are in correspondence with that observed in the literature for 4d transition metals using normalized L2,3 white lines. Lastly, a distinctive energy-loss near-edge, structure of the O-K edge was observed for each oxide, which could be used as a fingerprint for analysis of unknowns.",
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Stoichiometry and valence measurements of niobium oxides using electron energy-loss spectroscopy. / Olszta, M. J.; Wang, J.; Dickey, E. C.

In: Journal of Microscopy, Vol. 224, No. 3, 01.12.2006, p. 233-241.

Research output: Contribution to journalArticle

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