Ionic conductivity of electric field-assisted sintered gadolinia-doped ceria/alkali salts membranes
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2021
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BRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS
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Ceramic-carbonate dual-phase membranes were prepared according to the usual procedure:
by vacuum impregnation of molten sodium-lithium carbonates (NLC) into sintered porous
ceria-20 mol% gadolinia (20GDC) solid electrolyte cylindrical pellets; and also by flash
sintering samples with 75 wt.% (CeO2: 20 mol% Gd2O3) and 25 wt.% NLC. Sintering was
accomplished by applying 200 V cm-1 to the membrane positioned in a sample holder of a
dilatometer for monitoring thickness shrinkage, limiting the electrical current to 1 A.
Electrochemical impedance spectroscopy measurements were performed in the 5 Hz-13
MHz frequency range from 300ºC to 600ºC in composite ceramic membranes, covering the
solid-to-molten NLC temperature range. Analysis of the impedance diagrams allowed for the
evaluation of the oxide ion and carbon dioxide ion conductivities. The Arrhenius plots
showed the transition from oxide ion conduction (due to the solid electrolyte) to carbonate
ion conduction (due to the molten NLC). The ionic conductivity values of membranes flash
sintered at 420ºC in 2 min were higher than those of conventionally sintered membranes
and similar to reported values of membranes sintered at 690ºC for 2 h.
Como referenciar
CARVALHO, SABRINA G. de M.; MUCCILLO, ELIANA N. dos S.; MUCCILLO, REGINALDO. Ionic conductivity of electric field-assisted sintered gadolinia-doped ceria/alkali salts membranes. In: BRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS, August 30 - September 3, 2021, Online. Abstract... São Carlos, SP: Aptor Software, 2021. p. 299-299. Disponível em: http://repositorio.ipen.br/handle/123456789/32838. Acesso em: 26 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.