关键词: PLT厚膜, 介电性质, 光学性质, 溶胶-凝胶法

Abstract: Pb0.92La0.08TiO3 films with thicknesses between 580 and 1830nm were deposited on ITO-coated glass substrates by using a sol-gel process under a relative low temperature of 580℃. The results obtained show that the films are crystallized well with pure perovskite polycrystalline structure. The surfaces of the films are smooth and condense. With the increase of the film thicknesses, the grain sizes and dielectric constants of the films increase. The dielectric constant-electric field curves are symmetric about zero bias axis, and show the hysteresis for all the films. In addition the coercive fields E c decreases with the film thicknesses increasing. All the films are transparent and the absorption edges shift to longer wavelength with increasing thicknesses of the films. The refractive index (n) and extinction coefficient (k) of 1830nm thick film are 2.39 and 0.009, respectively, at 633nm wavelength.

Key words: erroelectric thick films, dielectric properties, optical properties, sol-gel