Study by Extended X‐ray Absorption Fine‐Structure Technique and Microscopy of the Chemical State of Yttrium in α‐Polycrystalline Alumina

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Abstract
Yttrium‐doped a‐poly crystalline alumina was studied by microscopy observations and by extended X‐ray absorption fine‐structure experiments. The latter results were compared to those obtained for a standard Y2O3 powder and to theoretical spectra for Y2O3, and Y3Al5O12 calculated on the basis of crystallographic data. Most of the yttrium in the doped alumina is precipitated as a Y3Al5O12 phase. An observed threshold displacement involves a slight valence electron delocalization for the Y3+ ion.