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Nanostructural HRTEM, HREELS and HAADF characterization of the La2Mo2O9 ion conductor


1. Electronics Department, University of Barcelona, C\ Martí i Franqu?s, Barcelona 08028, Spain
2. University of California, Davis, Department of Chemical Engineering and Materials Science (UC, Davis), Davis, CA, United States
3. Lawrence Berkeley National Laboratory, National Center for Electron Microscopy (LBNL), Berkeley, CA, United States
4. Serveis Cientificotècnics, University of Barcelona (SCT-UB), Lluis Sole i Sabaris, 1-3, Barcelona 08028, Spain


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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Presentation: oral at E-MRS Fall Meeting 2004, Symposium A, by Jordi Arbiol
See On-line Journal of E-MRS Fall Meeting 2004

Submitted: 2004-05-10 12:13
Revised:   2009-06-08 12:55