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Optical Properties of Lead Lanthanum Zirconate Titanate Amorphous Ferroelectric-Like Thin Films

Lead lanthanum zirconate titanate (PLZT) amorphous thin films, whose composition is 5/50/50, have been prepared by the sol–gel technique. The optical transmission property of the thin film was measured in the wavelength range of 200–820 nm. The ellipsometric spectra of the PLZT thin film on a glass substrate were measured in the wavelength range of 200–670 nm, and their optical constant (refractive index n and extinction coefficient k) spectra have been determined. The dispersion of the refractive index is interpreted in terms of a single electric oscillator at 9.64 eV. The direct band energy is found to be 3.67 eV.