Ionic Nanowires at 600 °C: Using Nanoarchitecture to Optimize Electrical Transport in Nanocrystalline Gadolinium-Doped Ceria


  • Financial support for this work was provided by the U.S. Office of Naval Research and the Université Paul Sabatier. This research was conducted during a sabbatical visit by Ch.L-R. at the Naval Research Laboratory. The authors wish to thank Dr. Christopher N. Chervin, a U.S. National Research Council–NRL Postdoctoral Associate (2006–2008) for critical and helpful discussions. Supporting Information is available online from Wiley InterScience or from the authors.


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The impact of nanoarchitecture on the electrical properties of sol–gel-derived Ce0.9Gd0.1O2 (CGO) is evaluated in O2 from 350 to 600 °C. The high degree of interconnectivity established between the < 10 nm crystallites in CGO aerogels (see figure) yields an electroceramic that responds as though it contains no grain boundaries and which exhibits long-range pathways for ionic diffusion (ca. 0.5 mm).