Dielectric properties of ionic conductors : Yttria stabilized zirconia and forsterite

— Two ionic conductors : yttria stabilized zirconia and nonstoichiometric forsterite were studied by an impedance complex method. For both materials, this technique allows us to separate, on each side of a caracteristic frequency wc, two domains corresponding to different relaxation mechanisms. The frequency a>c has been identified as the jump frequency of the charge carriers. The frequency dependence of the dielectric permittivity, below and above coc, has been discussed on the basis of a new model recently introduced by Jonscher.