Pure and doped polycrystalline samples were studied, at temperatures of between 50C and the melting point, using alternating-current techniques. It was found that the activation energy for conduction was equal to 1.31eV in the high-temperature region and equal to 0.41eV in the low-temperature region. In the latter case, the conductivity increased upon doping with KCl and decreased upon doping with YCl3. However, the activation energy was not significantly affected. The Sn2+ transference number was negligible, and the conduction was attributed to the influence of Cl- ions; migrating via a vacancy mechanism.

N.Kimura, Y.Niizeki: Solid State Ionics, 1981, 3-4, 385-8