Doped ceria transport properties

Litzelman, S.J., De Souza, R.A., Butz, B Tuller, H.L., Martin, M and Gerthsen, D. (2008) Heterogeneously doped nanocrystaUine ceria films by grain boundary diffusion Impact on transport properties. J. Electroceram.,... 

Many of the properties of ceria are intimately related to the tolerance of the fluorite structure towards high concentrations of oxide ion vacancies. In order to select the most appropriate doped ceria composition for a specific application, it is necessary to know the defect chemistry and thermochemistry of doped ceria and its relation to the thermomechanical, crystallographic, and transport properties. A brief description of the defect chemistry of ceria is provided in Section 12.2 of this chapter, followed by a short presentation of its thermal, crystallographic, and chemical properties and their dependence on doping and reduction. Thermodynamic data on X (in CeOg- ) as a function of oxygen partial pressure pOg and temperature, as well as the effect of substituents and particle size, will be a central topic of this chapter and will be discussed in Section 12.3. 

Due to its adjustable transport properties, suitably doped ceria may be used as an electrolyte (which must be an electronic insulator and a good ion conductor), as discussed in depth in Section 12.5, or as a dense oxygen separation membrane (which needs to be a MIEC). A dense oxygen separation membrane must conduct both... 

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