Abstract
The ionic conductivity of Yb2Ti2O7 and (Yb0.91Sc0.09)2Ti2O7 is shown to correlate with the degree of antisite cation disordering in these materials. The highest ionic conductivity is exhibited by materials containing 3.53–4.5% YbTi + TiYb antistructure pairs. This degree of cation disordering can be achieved by heat treatment just below the melting point of the material, by mechanical activation with subsequent high-temperature firing, and by doping on the Yb or Ti site. The YbTi + TiYb antistructure pairs and the associated Frenkel defects in the oxygen sublattice are responsible for oxygen ionic conduction.
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