February 3, 2005
Journal Article

Near-edge X-ray Absorption Fine Structure Study of Disordering in Gd2(Ti1-yZry)2O7 Pyrochlores

Abstract

Disorder in Gd2(Ti1-yZry)2O7 pyrochlores, for y=0.0-1.0, is investigated by Ti 2p and O 1s near-edge x-ray absorption fine structure spectroscopy. Ti4? ions are found to occupy octahedral sites in Gd2Ti2O7 with a tetragonal distortion induced by vacant oxygen sites. As Zr substitutes for Ti, the tetragonal distortion decreases, and Zr coordination increases from 6 to 8. The migration of oxygen ions from 48f or 8b sites to vacant 8a sites compensate for the increased Zr coordination, thereby reducing the number of vacant 8a sites, which further reduces the tetragonal distortion and introduces more disorder around Ti. This is evidence for simultaneous cation disorder with anion migration.

Revised: April 11, 2005 | Published: February 3, 2005

Citation

Nachimuthu P., S. Thevuthasan, E.M. Adams, W.J. Weber, B.D. Begg, B.S. Mun, and B.S. Mun, et al. 2005. Near-edge X-ray Absorption Fine Structure Study of Disordering in Gd2(Ti1-yZry)2O7 Pyrochlores. Journal of Physical Chemistry B 109, no. 4:1337-1339. PNNL-SA-43504.