It was recalled that direct-current conductivity in ionic conductors was proportional to the hopping rate of the charge carriers. Such hopping could result in a dielectric loss peak and the direct-current conductivity was also proportional to the loss peak-frequency. Here, the alternating-current conductivity of 12mol%Y2O3-doped zirconia was measured, and the relationship between the hopping frequencies, that were characteristic of the alternating-current conductivities, and the dielectric-loss peak-frequencies was examined. The peak frequencies in the complex impedance plane were also measured, and were compared with the hopping frequencies. It was demonstrated that 2 sample constants could be used to connect the 3 frequencies. It was suggested that the 3 frequencies were the consequence of a common phenomenon, and that all of them resulted from hopping of the charge carriers.

The Characteristic Frequencies for Ionic Conduction in 12mol%Y2O3 Doped ZrO2. J.Luo, E.F.Hairetdinov, D.P.Almond, R.Steve: Solid State Ionics, 1999, 122[1-4], 205-10