Nature of conductivity in SrSiO3-based fast ion conductors

In this paper we report the preparation and characterization of
Sr1xNaxSiO30.5x 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.