The conduction process in monocrystals of 1-dimensional cationic conductors, Ti7.2K1.6Mg0.8O16 and Ti6.4K1.6Al1.6O16, was studied by means of impedance spectroscopy (10Hz to 99GHz). The real part of the complex conductivity was approximately constant in the microwave frequency region. It was found that 2 partial thermally activated conduction processes contributed to ion conduction at microwave frequencies. One of these corresponded to ion conduction across the perturbed intrinsic barriers, with a period that was equal to the lattice constant along the c-axis.

S.Yoshikado, I.Taniguchi, M.Watanabe, Y.Onoda, Y.Fujiki: Solid State Ionics, 1995, 79, 34-9