Abstract
Abstract Ferroelectric BaTiO3 thin films were prepared by sol–gel-ethanolthermal technique (SGET) and sol–gel-hydrothermal technique (SGHT), respectively, at 200 °C. The microstructure characteristics proved that the prepared BaTiO3 thin films were both in the perovskite phase and had polycrystalline structure. The frequency dependences of nonlinear dielectric properties of the films were studied. The two films exhibited a high and very stable insulating characteristic against biasing. The films prepared by SHET tend to have a higher dielectric constant, loss, leakage current density and polarization than that of the films prepared by SGHT. The nonlinear variation of dielectric properties under external dc bias field was tentatively explained.
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