Nature of conductivity in SrSiO3-based fast ion conductors

In this paper we report the preparation and characterization of Sr1-xNaxSiO3-0.5x samples, recently proposed as oxide ion conductors. We show that Na-doping unlikely takes place in the silicate phase, and that a secondary glassy phase is at the origin of the transport properties, thereby suggesting that the conductivity is due only to a limited extent to oxide ion migration in the crystalline system.