The conduction of Na+ ions in single crystals of the 1-dimensional superionic priderite conductor, Ti6.3Na1.7Cr1.7O16, was studied by using an impedance spectroscopy method. A frequency-independent conduction process was observed in the low-frequency region. The conduction process was thermally activated, and the value of the total activation energy was about 0.288eV. The frequency-independent ion conductivity was equal to about 2 x 10-5S/cm at room temperature, and to 0.01S/cm at 200C.

Ion Conduction in Single Crystals of the Hollandite-Type One-Dimensional Superionic Conductor (Na,Cr,Ti)8O16. S.Yoshikado, Y.Michiue, Y.Onoda, M.Watanabe: Solid State Ionics, 2000, 136-137, 371-4