Properties of porous samaria-doped ceria ceramics with lithium fluoride as sacrificial pore former
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2016
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BRAZILIAN MRS MEETING, 15th
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Porous ceria: 10 mol% samaria (10SDC) ceramic solid electrolytes were prepared
by solid state reaction with 0-50 vol.% lithium fluoride (LiF). Consolidation was
done by heating to the melting point of LiF for 30 min to form a liquid phase,
followed by elimination of LiF by capillarity after heating to 1500° C for 2 h,
promoting intergranular porosity and 10SDC skeletal densification. Apparent
density was evaluated by the Archimedes method, pore distribution by scanning
electron microscopy and electrical properties by electrochemical impedance
spectroscopy in the 5 Hz - 13 MHz frequency range and temperatures from 300 to
550° C. The main results show that porous ceramics with high skeletal density are
obtained with sacrificial LiF. Moreover, the total electrical resistivity is directly
related to the pore volume fraction. High temperature vacuum impregnation of
lithium-potassium carbonate eutectic compositions onto the porous 10 SDC was
carried out to consolidate composite SDC-molten carbonate ceramic membranes
with tunable transport properties, for selective carbon dioxide separation. The
enhancement of the total electrical conductivity was evaluated by electrochemical
impedance spectroscopy. Percolation of the molten carbonate through the
permeable porous membrane was ascertained by EDX analysis on both parallel
surfaces of the membranes.
Como referenciar
PORFIRIO, TATIANE C.; MUCCILLO, ELIANA N. dos S.; FRANÇA, YONE V.; MARQUES, FERNANDO M.B.; MUCCILLO, REGINALDO. Properties of porous samaria-doped ceria ceramics with lithium fluoride as sacrificial pore former. In: BRAZILIAN MRS MEETING, 15th, September 25-29, 2016, Campinas, SP. Abstract... São Carlos, SP: Aptor Software, 2016. p. 666-666. Disponível em: http://repositorio.ipen.br/handle/123456789/28073. Acesso em: 30 Dec 2025.
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