Microstructural effects on the electrical properties of grain boundary Fe-doped LSGM
authors Gomes, E; Marques, FMB; Figueiredo, FM
nationality International
journal SOLID STATE IONICS
author keywords lanthanum gallate; grain boundary; mixed conductor; impedance spectroscopy; oxygen permeability
keywords ELECTROCHEMICAL PERMEABILITY; ELECTRONIC CONDUCTIVITY; MIXED CONDUCTION; OXIDES
abstract Mixed conductors based on grain boundary Fe-doped La0.95Sr0.05Ga0.90Mg0.10O3-delta (LSGM) ceramics were obtained by selectively doping the grain boundaries with Fe. This was achieved using LaFeO3-delta layers screen-printed onto LSGM, after annealing at high temperature in air for several hours to promote Fe diffusion into LSGM. The influence of the number of impregnation cycles, temperature of impregnation and microstructure of the host LSGM was evaluated by impedance spectroscopy and oxygen permeability. The impedance spectra consist of high and low frequency semicircles, ascribed to bulk and grain boundaries. The amplitude of both contributions decreases with increasing impregnation temperature and time, suggesting the onset of electronic conduction along grain boundaries. The effect is stronger for ceramics with larger grain size. The observed trends are fully consistent with estimates of p-type electronic conductivity obtained from oxygen permeability measurements using a simplified electrochemical cell. (c) 2008 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0167-2738
year published 2008
volume 179
issue 27-32
beginning page 1325
ending page 1328
digital object identifier (doi) 10.1016/j.ssi.2008.01.073
web of science category Chemistry, Physical; Physics, Condensed Matter
subject category Chemistry; Physics
unique article identifier WOS:000259276200012
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journal impact factor 2.751
5 year journal impact factor 2.607
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