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Synchrotron Radiation Ti‐ k XANES Study of TiO 2 ─Y 2 O 3 ‐Stabilized Tetragonal Zirconia Polycrystals
Author(s) -
Zschech Ehrenfried,
Kountouros Paris N.,
Petzow Günter,
Behrens Peter,
Lessmann Alex,
Frahm Ronald
Publication year - 1993
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1993.tb03707.x
Subject(s) - xanes , ion , valence (chemistry) , tetragonal crystal system , materials science , analytical chemistry (journal) , crystallography , zirconium , extended x ray absorption fine structure , spectroscopy , inorganic chemistry , absorption spectroscopy , crystal structure , chemistry , metallurgy , physics , quantum mechanics , organic chemistry , chromatography
Valence state and site symmetry of Ti ions in TiO 2 –Y 2 O 3 –ZrO 2 powders with 2 mol% Y 2 O 3 and 5, 10, 15, and 20 mol% TiO 2 , respectively, are studied by X‐ray absorption near‐edge spectroscopy (XANES). Tetravalent Zr 4+ ions are replaced predominantly by Ti 4+ ions. Within the solubility region of Ti ions, a subsequent displacement of Ti ions from the center of symmetry is observed with increasing TiO 2 content in TiO 2 –Y 2 O 3 ‐stabilized tetragonal ZrO 2 polycrystals (Ti‐Y‐TZP) under investigation. This behavior cannot be interpreted with a random substitution of Ti 4+ ions on Zr 4+ lattice sites. On the contrary, this correlation between the TiO 2 content in Ti‐Y‐TZP and the shift of Ti ions indicates an increasing interaction between the Ti ions with growing TiO 2 content, caused by a subsequent clustering of Ti ions.