Electrical conductivity and microstructure relationship in ternary systems based on cerium oxide
authors Horovistiz, AL; Rocha, RA; Muccillo, ENS
nationality International
journal CERAMICS INTERNATIONAL
author keywords Powders: chemical preparation; Ionic conductivity; CeO2; Fuel cells
keywords GADOLINIA-DOPED CERIA; CERAMICS; GD; DENSIFICATION; ELECTROLYTES
abstract The effects of small amounts of bismuth and sodium on the electrical conductivity of gadolinia-doped ceria are investigated. Bulk specimens of nominally pure Ce0.9Gd0.2O1.9 and Ce0.8Gd0.19M0.01O1.9 with M = Bi or Na were prepared by the cation complexation technique. Raman spectra of sintered specimens show a prominent band at approximately 464 cm(-1). assigned to the cubic fluorite-type lattice of cerium oxide. Both additives promoted changes in the microstructure of samples sintered at 1723 K. Bi-containing samples exhibit low porosity along with angular grains with mean grain size of about 1.7 mu m compared to 1.4 mu n of pure gadolinia-doped ceria. Addition of Na to gadolinia-doped ceria reduced the mean grain size (1.0 mu m) but porosity increased drastically. Electrical conductivity measurements were used to study mass transport. Analysis of impedance spectroscopy data shows that the apparent activation energy for conduction is slightly lower in samples containing the additives explaining the higher grain and grain boundary conductivities of the ternary systems. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0272-8842
year published 2013
volume 39
issue 5
beginning page 5887
ending page 5892
digital object identifier (doi) 10.1016/j.ceramint.2013.01.008
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000318577600143
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