Optical study of PLZT films on Al2O3 substrate
|Maria J. Gomes , Anatoli A. Khodorov|
University of Minho (UM), Campus de Gualtar, Braga 4710057, Portugal
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).
Presentation: poster at E-MRS Fall Meeting 2005, Laser Ceramic Symposium, by Maria J. Gomes
See On-line Journal of E-MRS Fall Meeting 2005
Submitted: 2005-07-19 11:25 Revised: 2009-06-07 00:44