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Mixed Electronic-Ionic Conductivity of Cobalt Doped Cerium Gadolinium Oxide

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Abstract

The effect of small amounts (<5 mol %) of cobalt oxide on the electrical properties of cerium oxide solid solutions has been evaluated. Ce0.8Gd0.2O2-x (CGO) powder with an average crystallite size of 20 nm served as a model substance for the electrolyte material with a high oxygen ion conductivity and low electronic conductivity in its densified state. Doping the CGO powder by transition metal oxides (MeO) with concentrations below 2 mol % did not change the ionic conductivity nor the electrolytic domain boundary. After long sintering times (2 h) at temperatures above 900°C, MeO and CeO2 form solid solutions. However, short sintering times or high dopant concentrations lead to an electronic conducting grain boundary phase short circuiting the ionic conductivity of the CGO grains. Choosing proper doping levels, sintering time and temperature allows one to tailor mixed conducting oxides based on CGO. These materials have potential use as electrolytes and/or anodes in solid oxide fuel cells and ion separation membranes.

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Authors
  1. C.M. Kleinlogel
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  2. L.J. Gauckler*
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Kleinlogel, C., Gauckler*, L. Mixed Electronic-Ionic Conductivity of Cobalt Doped Cerium Gadolinium Oxide. Journal of Electroceramics 5, 231–243 (2000). https://doi.org/10.1023/A:1026583629995

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