Oxide ion transport and phase stability in the excess oxygen scheelite phases

Conference Dates

March 10-14, 2019


Oxide ion conductors for use in electrochemical devices such as solid oxide fuel cells and electrolysers are typically viewed as requiring three-dimensional isotropic structures that will promote ion transport. The majority of materials considered as electrolytes in devices are based on either the fluorite or perovskite structure types. An essential feature of the materials is that they will accommodate a range of oxygen lattice defects, typically through cation substitution, that introduces vacancies to maintain charge neutrality, and it is the presence and mobility of these defects that produce fast oxide ion conductors. An alternative that has only recently been explored is the potential for oxygen interstitial species to provide fast ion transport pathways. Initially studies focussed on anisotropic materials such as the layered perovskites as potential electrode materials, but more recently our studies have focussed on new electrolyte families.

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