Dense (> 99%) samaria-doped cerium oxide show a conductivity dependence on grain size, as measured by AC impedance spectroscopy. With a grain size less than 20 nm, only one semicircle pertaining to bulk conductivity is observed, as indicated in the figure. The absence of the grain-boundary blocking effect has been reported before, but not in bulk materials with pure ionic conductivity. The observations are explained in terms of a space-charge model.
Nanoscale Effect on the Ionic Conductivity of Highly Doped Bulk Nanometric Cerium Oxide
RIELLO, Pietro;
2006-01-01
Abstract
Dense (> 99%) samaria-doped cerium oxide show a conductivity dependence on grain size, as measured by AC impedance spectroscopy. With a grain size less than 20 nm, only one semicircle pertaining to bulk conductivity is observed, as indicated in the figure. The absence of the grain-boundary blocking effect has been reported before, but not in bulk materials with pure ionic conductivity. The observations are explained in terms of a space-charge model.
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