Microstructure and electrical conductivity of sol-gel synthesized and spark plasma sintered doped-lanthanum gallate
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2023
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MATERIALS SCIENCE AND TECHNOLOGY
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Perovskite ceramics consisting of lanthanum gallate with partial substitutions for strontium and magnesium are candidates as solid electrolyte for application in solid oxide fuel cells operating at intermediate temperatures (~550 to ~750ºC). The main concern related to the application of this perovskite solid electrolyte is impurity phases, usually detected even in chemically synthesized powders. The La0.9Sr0.1Ga0.8Mg0.2O3-d (LSGM) composition display relatively low contents of impurity phases. In this work, the LSGM composition was synthesized by the sol-gel method and consolidated by spark plasma sintering to optimize the microstructure and electrical properties of this solid electrolyte. Chemically synthesized powders were consolidated in the 1100 to 1250ºC for 5 min. Sintered specimens with relative densities higher than 98% were obtained. Rietveld analysis of X-ray diffraction data revealed no detectable impurity phases. The microstructure evolution exhibited submicron sized grains with mixed fracture mode. High values of the electrical conductivity were obtained for all specimens.
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MUCCILLO, E.N.S.; REIS, S.L.; GONIN, C.F.N.; BERTON, M.A.C.; MUCCILLO, R. Microstructure and electrical conductivity of sol-gel synthesized and spark plasma sintered doped-lanthanum gallate. In: MATERIALS SCIENCE AND TECHNOLOGY, October 1-4, 2023, Columbus, Ohio, USA. Abstract... Disponível em: https://repositorio.ipen.br/handle/123456789/47968. Acesso em: 09 May 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.