Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.11960/3055
Title: Mixed conduction induced by grain boundary engineering
Authors: Gomes, Eduarda
Figueiredo, F. M.
Marques, F. M. B.
Keywords: Lanthanum gallate
Ionic conductivity
Issue Date: 2006
Citation: Gomes, E., Figueiredo, F. M., & Marques, F. M. B. (2006). Mixed conduction induced by grain boundary engineering. Journal of the European Ceramic Society, 26(14), 2991-2997. https://doi.org/10.1016/j.jeurceramsoc.2006.02.017
Abstract: Mixed oxygen-ion electronic conductors were prepared starting from the well-established solid lectrolyte La0.95Sr0.05Ga0.90Mg0.10O3−δ (LSGM). The adopted strategy involved selective grain boundary doping with iron to form a grain boundary region with high electronic conductivity. Scanning electron microscopy coupled with energy dispersive spectroscopy (SEM/EDS), impedance spectroscopy in air (around 300 ◦C) and high temperature (700–800 ◦C) ac conductivity measurements as a function of pO2 all suggest that this doping strategy was successful. In fact, on increasing the Fe-dopant level, Fe always concentrated along the grain boundary region (as confirmed by SEM/EDS), the total conductivity increased and each individual impedance arc decreased, in agreement with predictions based on the presence of a parallel pathway for electronic transport. Furthermore, the increase in total conductivity (σ) with dopant level showed a positive log σ versus log pO2 dependence, typical of hole conductivity.
URI: http://hdl.handle.net/20.500.11960/3055
ISSN: 0955-2219
Appears in Collections:ESTG - Artigos indexados à WoS/Scopus

Files in This Item:
File Description SizeFormat 
1-s2.0-S095522190600080X-main.pdf326.7 kBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.