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 16 μC/cm2 and 84 kV/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 ∞ + i σ / ε 0 ω + ( A { i ω } n − 1 ) / ε 0 . The occurrence of an anomaly in n, σ, A, and ɛ∞ parameters near Vc indicates a coupling between the charge carriers and ferroelectricity.