In the recent years, solid ionic and mixed ionic-electronic conductors (MIECs) have attracted much attention due to their applicability in solid oxide fuel cells (SOFCs) as electrolyte and electrode materials, respectively. Recently, La₂Mo₂O₉ has been presented as a promising electrolyte material for SOFCs, and recent results from our group confirmed that such compound fulfill some of the requirements for SOFCs applications such as a high ion conduction and a wide oxygen partial pressure range of pure ionic conduction. Nevertheless, the mechanism of oxygen conduction in La₂Mo₂O₉ is still not understood, in particular some questions remain about the strong decrease of conductivity from the cubic high-temperature (HT) phase to the monoclinic low-temperature (LT) phase. In the present work, we report a detailed structural and compositional characterization of the La₂Mo₂O₉ LT phase. The nanocompositional and nanostructural features of the LT-La₂Mo₂O₉ superstructure are put into evidence by means of HRTEM, HREELS, HREFTEM and HAADF.

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