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We consider the implications of the bond valence model (BVM) description ofcharge distribution in reduced ceria phases(CeO$_{2-x}$)\cite{Shoko2009,Shoko2009b} to the models used to describeelectronic and ionic conductivity in these phases. We conclude that the BVM isconsistent with both the small polaron model (SPM) and the atomistic modelswhich describe the electronic and ionic conductivities respectively. Forintermediate phases, i.e., $x \sim 0.3$, we suggest the possibility of lowtemperature metallic conductivity. This has not yet been experimentallyobserved. We contrast the BVM results and the conventional description ofcharge distribution in reduced ceria phases.

A Consistent Picture of Charge Distribution in Reduced Ceria Phases