Investigation of the dielectric properties of MnO-additive Pb(Fe2/3W1/3)–PbTiO3 relaxors prepared by two different methods

Abstract In this paper, 0.75Pb(Fe 2/3 W 1/3 )O 3 –0.25PbTiO 3 –0.15 wt% MnO (0.75PFW–0.25PT–0.15 wt% MnO) ceramics are synthesized by two different methods, the conventional direct oxide synthesized (DS) method and two-step indirect synthesized (IS) method. The low-field dielectric responses are investigated by using the empirical law, the Curie–Weiss law, the modified-Landau theory and the spin-glass model. Due to the IS method, the lattice structure and the grain structure of the samples are changed. Furthermore, the dielectric properties are evidently modified. It is suggested that the ordering degree of B-site cations is enhanced by using the IS synthesized method.