Abstract
The compound is a new material which has an intergrowth structure of rutile and β-gallia. The structure contains one-dimensional large channels with 3.4 to 3.6Å free diameter. Potassium ions which are accommodated in the channels show one-dimensional ionic conduction. The ionic conductivity is dependent on frequency as well as temperature and, in microwave frequency range, reaches into about 5 S/cm even at ambient temperature. The value is much larger than the microwave ion conductivity of Naβ-Al2O3. In addition, this material seems to be superior in one-dimensional properties of ion transport to priderites with the hollandite-type structure.
