Relaxor behavior and dielectric properties of lead magnesium niobate-lead titanate thick films prepared by electrophoresis deposition

摘要

Lead magnesium niobate-lead titanate (0,80Pb(Mg_(1/3)Nb_(2/3))O_3-0.20PbTiO_3, PMN-PT) thick films on platinum metallic foils were successfully fabricated by electrophoretic deposition (EPD). The room temperature relative dielectric constant and the maximum relative dielectric constant were 4645 and 25,640 at 1 kHz, respectively. The relaxor nature of PMN-PT thick films was studied in terms of diffused phase transition along with frequency dispersion of temperature of dielectric maximum (T_m). Deviation from Curie-Weiss behavior and temperature evolution of the local order parameter were found in the films. The degree of relaxation obtained from the modified Curie-Weiss law strongly suggests the relaxor behavior. Vogel-Fulcher relationship was used to analyze the frequency dependence of temperature of dielectric maximum (T_m).