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Dielectric Relaxation Mechanisms in Relaxor Bi-Layered Perovskites

Sr1-xBaxBi2Nb2O9 (x = 50 and 90 mol%) ferroelectric bi-layered perovskites exhibit a complex dielectric response, showing typical relaxor behavior with strong dispersion of the dielectric permittivity. The Cole-Cole model describes the relaxation processes. Two relaxation processes are analyzed considering: i) the relaxor-like ferroelectric behavior, resulting from the inhomogeneous distribution of barium due to its preference for the bismuth site in the (Bi2O2)2+ layers, and ii) the interaction between the dipoles, which form the microdomains above the relaxor ferroelectric peak, and the electrons, which are due to the ionization of the oxygen vacancies.