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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 |
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1-s2.0-S095522190600080X-main.pdf | 326.7 kB | Adobe PDF | View/Open |
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