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Electrical conductivity and high dielectric constant are in principleself-excluding, which makes the terms insulator and dielectric usuallysynonymous. This is certainly true when the electrical carriers are electrons,but not necessarily in a material where ions are extremely mobile, electronicconduction is negligible and the charge transfer at the interface isimmaterial. Here we demonstrate in a perovskite-derived structure containingfive-coordinated Ti atoms, a colossal dielectric constant (up to $\mbox{10}^9$)together with very high ionic conduction $\mbox{10}^{-3}\mbox{S.cm}^{-1}$ atroom temperature. Coupled investigations of I-V and dielectric constantbehavior allow to demonstrate that, due to ion migration and accumulation, thismaterial behaves like a giant dipole, exhibiting colossal electricalpolarization (of the order of $\mbox{0.1\,C.cm}^{-2}$). Therefore, it may beconsidered as a "ferro-ionet" and is extremely promising in terms ofapplications.

$\mbox{Rb}_{2}\mbox{Ti}_2\mbox{O}_{5-\delta}$: A superionic conductor with colossal dielectric constant