Dielectric properties of Na0.7CoO2 and of the superconducting Na0.3CoO2•1.3H2O

We present dielectric properties of ceramic anhydrous Na0.7CoO2 and the superconducting Na(0.3)CoO(2)(.)13H(2)O materials. The presence of water which induces superconductivity also may increase the dielectric constant (epsilon) of the hydrated material. This is consistent with the predicted relationship between the high epsilon and the enhancement of T-c in high T-c superconductors. The anhydrous sample is porous and the transport is due to some percolation via the pores. The porosity is much higher for the hydrated material and the transport is ionic inside bulk water.