Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1298728 | Solid State Ionics | 2008 | 4 Pages |
Abstract
The electrical properties of La0.95Sr0.05Ga0.90Mg0.10O3 â δ (LSGM) were modified by selective doping of the grain boundaries, using LaFeO3 screen-printed layers and annealing at high temperature to promote Fe diffusion into LSGM. Scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) analyses showed that iron was mainly located along the grain boundaries with the bulk grain composition almost unchanged. Impedance spectra showed a significant increase in the total conductivity for the Fe-doped samples, the effect being greater for the grain boundary contribution. The formation of a parallel pathway for electronic conduction along the grain boundaries explains these effects. Ageing of these samples at high temperature, after removal of the Fe source, showed a steady shift to the original LSGM behaviour, due to dilution of Fe throughout the samples.
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Authors
E. Gomes, F.M. Figueiredo, F.M.B. Marques,