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Related Experiment Videos

Electron beam induced changes in transition metal oxides.

D S Su1

  • 1Department of Inorganic Chemistry, Fritz Haber Institute of MPG, Faradayweg 4-6, 14195 Berlin, Germany. dangsheng@fhi-berlin.mpg.de

Analytical and Bioanalytical Chemistry
|October 25, 2002
PubMed
Summary

Electron beams alter vanadium pentoxide (V2O5) and molybdenum trioxide (MoO3) but not titanium dioxide (TiO2). V2O5 reduces to V2+, and MoO3 to a lower oxidation state, with structural changes observed.

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Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Electron Microscopy

Background:

  • Transition metal oxides are crucial in various technological applications.
  • Understanding their stability under electron beam irradiation is essential for electron microscopy techniques.
  • Electron beam-induced degradation can alter material properties and analytical results.

Purpose of the Study:

  • To investigate the effects of electron beam irradiation on V2O5, MoO3, and TiO2 (anatase).
  • To characterize the resulting chemical and structural changes using advanced analytical methods.
  • To correlate observed changes with fundamental properties like bonding energy and lattice structure.

Main Methods:

  • Transmission electron microscopy (TEM) combined with electron energy-loss spectroscopy (EELS).

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  • Electron diffraction for structural analysis.
  • Analysis of L-edge chemical shifts for oxidation state determination.

    • Main Results:

    • Vanadium pentoxide (V2O5) showed significant reduction from V(5+) to V(2+) and a structural transformation from orthorhombic to cubic VO.
    • Molybdenum trioxide (MoO3) was reduced to a phase with an oxidation state lower than MoO2.
    • Titanium dioxide (TiO2) in its anatase form exhibited no significant structural or electronic changes under electron beam exposure.

    Conclusions:

    • The susceptibility of transition metal oxides to electron beam damage varies significantly.
    • Bonding energy and lattice structure are key factors influencing the stability of these oxides.
    • V2O5 and MoO3 are prone to reduction and structural modification, while TiO2 (anatase) demonstrates higher stability.