In the composition range near the morphotropic phase boundary La-modified lead zirconate titanate (PLZT) ferroelectrics show the enhanced ferroelectric, electro-mechanic and electro-optic properties that make the material to be very interest for application in electronic and electro-optic devices. In this work, we prepared PLZT films of composition 9/65/35 on Al₂O₃ substrate with sol-gel method and studied their optical and structure properties. The dielectric function was calculated by fitting the transmittance and reflectance spectra of the films measured in the wave-length region 220-2600 nm. The optical study revealed appearing of anomalous behaviour of dielectric function below the absorption edge when the perovskite ferroelectric phase was achieved during crystallization. The shift of absorption edge as well as evolution of band tailing with film thickness were studied. The correlation between optical and structure properties of the films was carried out and discussed.

This work was supported by FCT (grant SFRH/BPD/11675/2002).

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