Influence of calcium addition on the electrical conductivity of samarium doped ceria
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2018
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INTERNATIONAL CONFERENCE & EXPOSITION ON ADVANCED CERAMICS AND COMPOSITES, 42nd
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Resumo
Ceria-based ceramics have been proposed to be used as solid electrolyte
in solid oxide fuel cells operating at intermediate (500-750°C)
temperatures, due to their high ionic conductivity. Samarium ion
is recognized as one of the most reliable dopants for cerium oxide
because of its lower association energy with oxygen vacancies. One
challenge posed to ceria-based solid electrolytes is how to improve
sinterability, avoiding high temperatures to attain good densification.
Thermal treatments at high temperatures may reduce Ce4+ to
Ce3+, favoring electron transport and generation of micropores in
the sintered electrolyte. Introduction of a second additive is a usual
approach to overcome these constraints. In this work calcium ion
was chosen as the second additive. Sm0.2-xCaxCe0.8O1.9-x/2 compositions,
with x = 0, 0.025, 0.05, 0.1, 0.15 and 0.2, were prepared by
solid-state reaction, and the influence of the additive content on
densification and ionic conductivity was investigated. All compositions
were found to have cubic fluorite-type structure. The optimal
composition was Sm0.175Ca0.025Ce0.8O1.888, which showed a relative
density of 97%, single phase and higher ionic conductivity than the
Sm0.2Ce0.8O1.9 parent electrolyte.
Como referenciar
REIS, S.L.; MUCCILLO, E.N. Influence of calcium addition on the electrical conductivity of samarium doped ceria. In: INTERNATIONAL CONFERENCE & EXPOSITION ON ADVANCED CERAMICS AND COMPOSITES, 42nd, January 21-26, 2018, Daytona Beach, Florida, USA. Abstract... Westerville, OH, USA: The American Ceramic Society, 2018. p. 97-97. Disponível em: http://repositorio.ipen.br/handle/123456789/30208. Acesso em: 20 Apr 2024.
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.