SHIRLEY LEITE DOS REIS
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Artigo IPEN-doc 21671 Microstructure and electrical conductivity of fast fired Sr- and Mg-doped lanthanum gallate2016 - REIS, S.L.; MUCCILLO, E.N.S.La0.9Sr0.1Ga0.8Mg0.2O3−δ solid electrolytes were consolidated by fast firing aiming to investigate the effects of the sintering method on densification, microstructure and ionic conductivity. Powder mixtures were prepared by solid state reaction at 1250 and 1350 °C for 12 h, and fast fired at 1450 and 1500 °C temperatures for 5 and 10 min. The content of impurity phases was found to be quite low with this sintering method. Relatively high density (>90% of the theoretical value) and low porosity (<1.5%) were readily obtained for powder mixtures calcined at 1250 °C. The activation energy for conduction was approximately 1 eV. Specimens fast fired at 1450 °C for 10 min with a mean grain size of 2.26 µm reached the highest value of total ionic conductivity, 22 mS cm−1, at 600 °C.Artigo IPEN-doc 17257 Solid solution formation, densification and ionic conductivity of Gd- and Sm-doped ceria2011 - REIS, S.L.; SOUZA, E.C.C.; MUCCILLO, E.N.S.