Preparation of dense La0.9Sr0.1Ga0.8Mg0.2O3-δ with high ionic conductivity by solid-state synthesis
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2018
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The results of a systematic investigation on the effects of processing steps, via solid-state reactions, on structural phase
characteristics and ionic conductivity of La0.9Sr0.1Ga0.8Mg0.2O3-δ solid electrolyte are reported. The main purpose of this work is
to establish an optimized route for obtaining good densification and high ionic conductivity of this solid electrolyte. Processing
routes with three successive calcinations at 1250 °C followed by attrition milling (R1), and with two sequences of calcination at
1350 °C with intermediary attrition milling (R2) give rise to near full density at 1450 °C sintering temperature. The rate of grain
growth is fast when the relative density reaches 95%. Elemental mapping reveals uniform distribution of the constituents in the
matrix along with La4Ga2O9, LaSrGa3O7 and sub-micrometer MgO grains at grain boundaries. The ionic conductivity of grains
remains unchanged with the processing route and sintering profile. The blocking effect of charge carriers at grain boundaries
decreases with increasing the dwell temperature.
Como referenciar
REIS, S.L.; MUCCILLO, E.N.S. Preparation of dense La0.9Sr0.1Ga0.8Mg0.2O3-δ with high ionic conductivity by solid-state synthesis. Ionics, v. 24, n. 6, p. 1693-1700, 2018. DOI: 10.1007/s11581-017-2344-y. Disponível em: http://repositorio.ipen.br/handle/123456789/28524. Acesso em: 06 Jun 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.