Abstract
Ce ions were implanted in Y2O3. Via x-ray absorption spectroscopy, Ce was found to occupy the Y site, and to be surrounded by oxygen atoms. However, contrary to what one would expect on the basis of this substitution, the oxidation state was not purely trivalent. Thanks to the Anderson impurity model, it was possible to interpret the x-ray absorption features near the edge. Ce is found in an intermediate charge state resulting from the interaction of the f state with the valence band of Y2O3.
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