The motion of mobile alkali ions in single crystals of 1-dimensional superionic-conducting compounds, AxGa8Ga8+xTi16-xO56, was studied by performing alternating-current complex conductivity measurements at 20Hz to 98GHz. The data were analyzed by using the moving-box model. The complex conductivity obeyed a power-law function of frequency. The conductivity was thermally activated, and the activation energy was equal to 1.22eV for Ga16Ti16KO56. The conduction mechanism was explained in terms of the motion of the extra O ions in the conduction path (1-dimensional tunnel), and the push-pull motion of Ga3+ ions between tetrahedral sites in the tunnel framework and interstitial sites in the conduction path.

Ion Conduction in One-Dimensional Ionic Conductor. S.Yoshikado, H.Funatomi, M.Watanabe, Y.Onoda, Y.Fujiki: Solid State Ionics, 1999, 121[1-4], 127-32