Synchrotron Radiation Ti‐k XANES Study of TiO₂─Y₂O₃‐Stabilized Tetragonal Zirconia Polycrystals

authored by

Ehrenfried Zschech, Paris N. Kountouros, Günter Petzow, Peter Behrens, Alex Lessmann, Ronald Frahm

Abstract

Valence state and site symmetry of Ti ions in TiO₂–Y₂O₃–ZrO₂ powders with 2 mol% Y₂O₃ and 5, 10, 15, and 20 mol% TiO₂, respectively, are studied by X‐ray absorption near‐edge spectroscopy (XANES). Tetravalent Zr⁴⁺ 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 TiO₂ content in TiO₂–Y₂O₃‐stabilized tetragonal ZrO₂ 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 TiO₂ content in Ti‐Y‐TZP and the shift of Ti ions indicates an increasing interaction between the Ti ions with growing TiO₂ content, caused by a subsequent clustering of Ti ions.

External Organisation(s)

Max Planck Institute for Intelligent Systems
University of Konstanz
Deutsches Elektronen-Synchrotron (DESY)

Type

Article

Journal

Journal of the American Ceramic Society

Volume

76

Pages

197-201

No. of pages

5

ISSN

0002-7820

Publication date

01.1993

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Ceramics and Composites, Materials Chemistry

Electronic version(s)

https://doi.org/10.1111/j.1151-2916.1993.tb03707.x (Access: Closed)