Influence of coprecipitation route on electrical conductivity of ceria-based ceramics
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2010
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INTERNATIONAL CONFERENCE ON ELECTROCERAMICS, 12th
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Resumo
Ceria-based ceramics (CeO2) are oxygen ion conductors and have high ionic
conductivity at temperatures around 500ºC, allowing their application as solid electrolyte in
Intermediate Temperature Solid Oxide Fuel Cells (IT-SOFC). In this work, samaria- and
gadolinia-doped ceria powders with composition Ce0.8(SmGd)0.2O1.9 were synthesized by
hydroxide, oxalate and carbonate coprecipitation routes. A concentrate of rare earths
containing 90 wt.% of CeO2 and another containing 51 wt.% of Sm2O3 and 30 wt.% of
Gd2O3, prepared from monazite processing, were used as starting materials. The main purpose
of this work is to study the effect produced by several precipitant agents on the electrical
conductivity of doped-ceria and to verify the possibility of using rare-earth concentrates to
obtain sintered ceramics with high density and suitable electrical properties. The obtained
powders were calcined at 600°C and the pressed pellets were sintered at 1500°C. The results
have shown that the powders have high values of specific surface area (>100 m2
.g
-1) and
cubic fluorite-type structure. The morphologies of particles and agglomerates, observed by
scanning electron microscopy, depend on the precipitant agent. Highly dense samples (> 95%
of the theoretical value) were obtained. The electrical conductivity behavior determined by
impedance spectroscopy depends on the employed precipitant agent. Moreover, a
considerable electronic conductivity is verified due to a combined electrical effect of several
rare-earth cations present in these concentrates.
Como referenciar
ARAKAKI, ALEXANDER R.; YOSHITO, WALTER K.; USSUI, VALTER; LAZAR, DOLORES R.R.; MUCCILLO, ELIANA N. dos S. Influence of coprecipitation route on electrical conductivity of ceria-based ceramics. In: INTERNATIONAL CONFERENCE ON ELECTROCERAMICS, 12th, June 13-16, 2010, Noruega. Abstract... Disponível em: http://repositorio.ipen.br/handle/123456789/22267. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.