Grain boundary Fe-doping effects in LSGM
authors Gomes, E; Figueiredo, FM; Marques, FMB
nationality International
journal SOLID STATE IONICS
author keywords lanthanum gallate; grain boundary; mixed conductor; impedance spectroscopy
keywords ELECTRONIC CONDUCTIVITY; MIXED CONDUCTION; PERMEABILITY; OXIDES
abstract The electrical properties of La(0.95)Sr(0.05)Cia(0.90)Mg(0.10)O(3-delta) (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. (C) 2008 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0167-2738
year published 2008
volume 179
issue 21-26
beginning page 900
ending page 903
digital object identifier (doi) 10.1016/j.ssi.2008.01.057
web of science category Chemistry, Physical; Physics, Condensed Matter
subject category Chemistry; Physics
unique article identifier WOS:000259269100035
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journal analysis (jcr 2017):
journal impact factor 2.751
5 year journal impact factor 2.607
category normalized journal impact factor percentile 58.483
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