FUJIMOTO, T.G.MUCCILLO, E.N.S.CARVALHO, L.A.2019-02-252019-02-25FUJIMOTO, T.G.; MUCCILLO, E.N.S.; CARVALHO, L.A. Ionic conductivity of Sr- and Mg-doped lanthanum gallate with La1.55Sr0.55Ga3O7+delta addition. In: INTERNATIONAL CONGRESS ON CERAMICS, 7th; CONGRESSO BRASILEIRO DE CERÂMICA, 62., June 17-21, 2018, Foz do Iguaçu, PR. <b>Abstract...</b> p. 537-537. Disponível em: http://repositorio.ipen.br/handle/123456789/29694.http://repositorio.ipen.br/handle/123456789/29694Sr- and Mg-doped lanthanum gallates are solid electrolytes with ionic conductivity higher than that of the traditional yttria-stabilized zirconia. Moreover, doped lanthanum gallates exhibit wide electrolytic domain and good chemical stability. The combination of their properties turns this compound a promising candidate for application in solid oxide fuel cells operating at intermediate temperatures (550-750°C). In this work, small amounts of La1.55Sr0.55Ga3O7+δ was added to doped lanthanum gallate and the effects of the additive on electrical properties of the base material were investigated by the impedance spectroscopy technique. The X-ray diffraction patterns of sintered specimens show the characteristic reflections of the perovskite-type phase, along with low-intensity diffraction peaks of the commonly detected impurity phases. The impedance spectroscopy diagrams reveal the high-frequency arc due to the bulk resistivity besides a strong overlap of the grain boundary arc with that of the electrode. The grain resistivity decreases for increasing amounts of La1.55Sr0.55Ga3O7+δ.537-537openAccessdoped materialsstrontiummagnesiumperovskitegallium oxideslanthanum oxidesionic conductivitygrain boundariesResumo de eventos científicosaguardandohttps://orcid.org/0000-0001-9219-388X