Electric response as a function of applied voltage of Bi3.25La0.75Ti3O12 thin films grown by pulsed-laser deposition

We have investigated the electrical properties of pulsed-laser deposited Bi3.25La0.75Ti3O12 (BLT) ferroelectric thin films. The obtained values of remanent polarization (2Pr) and coercive field (Ec) were 16μC/cm2 and 84kV/cm of BLT thin film, respectively. A strong low frequency dielectric dispersion (LFDD) has been observed above and below coercive voltage (Vc). A model was proposed to account for the observed phenomena, which fits very well to the dielectric dispersion relation: ε*=ε∼+iσ/ε0ω+(A{iω}n-1)/ε0. The occurrence of an anomaly in n, σ, A, and -bar ∼ parameters near Vc indicates a coupling between the charge carriers and ferroelectricity