Study of Non Stoichiometric Pure and Zr-Doped Yttria Surfaces by X-Ray Photoelectron Spectroscopy and Scanning Electron Microscopy
Surfaces of oxygen-deficient yttrium oxide, pure or Zr-doped, have been studied by means of X-ray photoelectron spectroscopy and scanning electron microscopy.
The bulk local geometric structure of these non-stoichiometric compounds was previously determined around the Y atom by an EXAFS (Extended X-ray absorption fine structure) study.
The local electronic structure around both Y and 0, at the surface, was investigated by X-ray photoelectron spectroscopy.
The partial transfer of the electronic distribution between the anion and the cation was probed using the Auger parameter.
In the pure oxygen-deficient sample, the concentration of oxygen vacancies appears to be increased at the grain boundaries.
The Auger parameter shows upon reduction an evolution of the Y-0 bond towards a more covalent one, this evolution being modulated with the presence of ZrO2.
KeywordsOxygen Vacancy Secondary Electron Image Yttrium Oxide Anionic Vacancy Auger Parameter
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