Silica-scavenging effects in ceria-based solid electrolytes
authors Ivanova, D; Kovalevsky, A; Kharton, VV; Marques, FMB
nationality International
journal BOLETIN DE LA SOCIEDAD ESPANOLA DE CERAMICA Y VIDRIO
author keywords ceria; scavenging effect; silica; grain boundary
keywords IONIC-CONDUCTIVITY; ALUMINA ADDITION; ZIRCONIA; CERAMICS; TRANSPORT; OXIDE; DY
abstract Composite materials based on gadolinium doped ceria (CGO) with additions of silica, with both silica and lanthanum oxide, and with lanthanum silicate, were prepared by the conventional ceramic route, to assess the silica scavenging role of lanthanum oxide additions. Structural, microstructural and electrical characterization of these samples confirmed the formation of one apatite type lanthanum silicate-based phase from reaction of silica with lanthanum oxide. The formation of this phase occurred in parallel with a significant enhancement of the grain boundary conductivity of these composite materials. Further interaction between constituents, involving diffusion of La to CGO, and Cc and Gd to the apatite phase, had no significant consequences on the electrical performance of these materials. Overall, lanthanum oxide was shown to remove the siliceous phases from the grain boundaries of CGO.
publisher SOC ESPANOLA CERAMICA VIDRIO
issn 0366-3175
year published 2008
volume 47
issue 4
beginning page 201
ending page 206
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000261971600004
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  impact metrics
journal analysis (jcr 2017):
journal impact factor 1.049
5 year journal impact factor 0.524
category normalized journal impact factor percentile 53.704
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