Abstract
Layer-by-layer epitaxial structures of gadolinia-doped ceria and zirconia have been synthesized on Al 2 O 3 (0001) using oxygen plasma-assisted molecular beam epitaxy. Increase in oxygen ion conductivity is observed with an increasing number of layers compared to bulk polycrystalline yttria-stabilized zirconia and gadolinia doped ceria electrolytes. The conductivity enhancement in these layered electrolytes is interesting, yet the exact cause for the enhancement remains unknown. For example, the space charge effects that are responsible for analogous conductivity increases in undoped layered halides are suppressed by the much shorter Debye screening length in layered oxides. Therefore, it appears that a combination of lattice strain and extended defects due to lattice mismatch between the heterogeneous structures may contribute to the enhancement of oxygen ionic conductivity in this layered oxide system.
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