Influence of Nb additive on the properties of lead titanate thin film

Thin films of Nb-doped PbTiO/sub 3/ (PNT) were formed on Pt-coated Si by chemical solution deposition. The substitution of Nb for the Ti-site has been shown by the changes in profile of the lattice vibration related to the Ti cation. We have studied the influence of Nb additive on the structure, surface morphology and properties of the PNT film. The tetragonality of the film decreases with increasing Nb content. The dielectric constants of the films displayed strong frequency dependence. Although the Nb addition leads to the decrease in the polarization for PNT film, it effectively improves the properties of leakage current.