Mixed conduction induced by grain boundary engineering
authors Gomes, E; Figueiredo, FM; Marques, FMB
nationality International
journal JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
author keywords lanthanum gallate; ionic conductivity
keywords OXYGEN PERMEATION PROPERTIES; ELECTRICAL-PROPERTIES; ELECTRONIC CONDUCTION; COMPOSITE MEMBRANES; LANTHANUM GALLATE; BISMUTH OXIDE; DC TECHNIQUES; PERMEABILITY; TRANSPORT; SYSTEM
abstract Mixed oxygen-ion electronic conductors were prepared starting from the well-established solid electrolyte La0.95Sr0.05Ga0.90Mg0.10O3-delta (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 degrees C) and high temperature (700-800 degrees C) ac conductivity measurements as a function of po(2) 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 (or) with dopant level showed a positive log a versus log Po-2 dependence, typical of hole conductivity. (c) 2006 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0955-2219
year published 2006
volume 26
issue 14
beginning page 2991
ending page 2997
digital object identifier (doi) 10.1016/j.jeurceramsoc.2006.02.017
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000240165200022
  ciceco authors
  impact metrics
journal analysis (jcr 2017):
journal impact factor 3.794
5 year journal impact factor 3.536
category normalized journal impact factor percentile 98.148
dimensions (citation analysis):
altmetrics (social interaction):



 


Apoio

1suponsers_list_ciceco.jpg