Eu3+ as a luminescent probe for the local structure of trivalent dopant ions in barium zirconate-based proton conductors
Journal article, 2013
The luminescence spectra and decay kinetics of dry and hydrated samples of BaZr0.9Y0.099Eu0.001O2.95 have been measured at room temperature. The spectra of the dry sample evidence two D-5(0) -> F-7(0) bands clearly indicating that Eu3+ (replacing Y3+ in the Zr4+ position of the average cubic perovskite structure) occupies two different local structures, whilst only one Eu3+ site is observed for the hydrated material. From the spectral data, it is possible to identify the nature of these two sites and to propose point group symmetries for the average local geometry around Eu3+. The decay time of the D-5(0) level becomes shorter upon hydration, due to the interaction with high-frequency O-H stretching vibrations, indicating an attractive interaction between protons and dopant atoms. (C) 2013 Elsevier B.V. All rights reserved.
emission-spectrum
europium(iii)
structure
Proton-defect association
Hydration
spectroscopy
Luminescence
eu-3+
BaZrO3
Local
crystals
Proton conducting oxides
Eu3+
Author
P. Haro-Gonzalez
Verona University
Maths Karlsson
Chalmers, Applied Physics, Condensed Matter Physics
Samuel Mwaniki Gaita
University of Nairobi
Christopher Knee
Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry
M. Bettinelli
Verona University
Solid State Ionics
0167-2738 (ISSN)
Vol. 247 94-97Subject Categories
Physical Sciences
Chemical Sciences
DOI
10.1016/j.ssi.2013.06.008