Valence state and site symmetry of Ti ions in Ti0,-Y,O,-ZrO, powders with 2 mol% Y,O, and 5, 10, 15, and 20 mol% TiO,, respectively, are studied by X-ray absorption near-edge spectroscopy (XANES). Tetravalent Z P ions are replaced predominantly by Ti4+ ions.
Within the solubility region of Ti ions, a subsequent displacement of Ti ions from the center of symmetry is observed with increasing TiO, content in Ti0,-Y,O,-stabilized tetragonal ZrO, polycrystals (Ti-Y-TZP) under investigation. This behavior cannot be interpreted with a random substitution of Ti4+ ions on Zr4+ lattice sites. On the contrary, this correlation between the TiO, content in Ti-Y-TZP and the shift of Ti ions indicates an increasing interaction between the Ti ionswith growing TiO, content, caused by a subsequent clustering of Ti ions.
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