Eu3+ as a luminescent probe for the local structure of trivalent dopant ions in barium zirconate-based proton conductors
Artikel i vetenskaplig tidskrift, 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+

Författare

P. Haro-Gonzalez

Universita degli Studi di Verona

Maths Karlsson

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Samuel Mwaniki Gaita

University of Nairobi

Christopher Knee

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

M. Bettinelli

Universita degli Studi di Verona

Solid State Ionics

0167-2738 (ISSN)

Vol. 247 94-97

Ämneskategorier

Fysik

Kemi

DOI

10.1016/j.ssi.2013.06.008