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The present trend is to investigate the co-doping approach in ceria either to improve further the electrical conductivity or sintering property. In this study, nano-structured Er and La co-doped ceria powders have been prepared by a novel solid state reaction method. In all the compositions, total dopant cation concentration has been kept at 0.20 atom fraction having general formulae Ce0.8Er0.2xLaxO1.9 (0 ≤ x ≤ 0.06). The phase structure, sintering activity, relative density, microstructure, and electrical properties were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and AC impedance spectrum analyzer, respectively. All the samples calcined at 800 oC crystallized into cubic fluorite structure with the grain size between 20-25 nm, and La content has little impact on the grain size of the powders. SEM shows that the size of the crystal particles is of relatively uniform without pores with La addition 0.02 sintered at 1250 oC. When the content of La was 0.02, sintered at 1250 oC measured at 800 oC, the conductivity reached the maximum value of 3.5×10 -2 S cm -

The Preparation and Electrical Properties of La Doped Er0.2Ce0.8O1.9 Based Solid Electrolyte