Phase transition in sol-gel-derived barium titanate thin films

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Abstract
The phase transition in sol-gel-derived barium titanate thin films has been investigated. The room temperature dielectric constant ) and loss tangent of the films were found to be 400 and 0.01 respectively. The dielectric constant has a broad peak of lower magnitude at . The polarization-field relationship ( P- E) had a saturated hysteresis curve at room temperature. The spontaneous polarization , remanent polarization and coercive field of the film determined from the P- E hysteresis were found to be , and respectively. The capacitance-voltage ( C- V) and conductance-voltage (G-V) characteristics of the film also exhibit hysteresis. The coercive field determined from the C- V characteristic is slightly lower than that determined from the P- E hysteresis loop. The capacitance and conductance decreased with the dc bias even at temperatures well above the transition temperature.