Abstract
Charge transport in oxide crystals is strongly influenced by the existence of defects, especially oxygen vacancies, which are naturally present in these materials. In this chapter we discuss the importance of structural disorder in determining long range oxide ion conductivity. In particular, we analyze ion dynamics in some oxide crystals with pyrochlore and fluorite structures that are currently used as electrolytes in devices for energy generation. We will describe charge transport across grain boundaries in polycrystalline materials and the importance of space charge effects when the grain size is reduced to the nanometer range. Finally, we discuss how the accumulation of oxygen vacancies at the interfaces in thin film heterostructures can deeply modify performance and functionalities of electrochemical and oxide electronics devices.
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