Ionic conductivity ofβ-AgI

We have measured the silver-ion conductivity in single-crystal $\beta$-AgI between 330 K and the $\beta$-to-$\alpha$ transition at 420 K by the complex impedance method. The conductivity is approximately isotropic, with pronounced curvature in the ${\log }_{10}\left(\sigma T\right)$ versus $\frac{1}{T}$ representation. We found the surface conduction perpendicular to $c$ to be significant. Detailed measurements in the vicinity of the $\beta$-to-$\alpha$ transition show no evidence for unusual pretransition silver sublattice melting.