Dipolar glass state in BaCe0.3Ti0.7O3 perovskite solid solutions

An extensive broadband dielectric spectroscopy study of BaCe0.3Ti0.7O3 ceramics is presented. The distribution of relaxation times of the system derived from the frequency dependence of complex dielectric permittivity are similar to the ones observed in dipolar glasses. Therefore, it is demonstrated that the dipolar glass model, which is applied here for the first time for disordered perovskite oxides is able to properly describe the dielectric behavior of BaCe0.3Ti0.7O3 solid solution. The observed dipolar glass behavior in such BaTiO3-based solid solution is clearly different from the canonical Pb-based relaxors and the two types of dielectric behavior are comparatively discussed.