Dielectric and pyroelectric studies of lead calcium titanate thin films

Thin ferroelectric films of calcium modified lead titanate (Pb_1-xCa_xTiO₃) have been prepared by sol gel spin coating process on ITO coated corning glass 7059 substrates. The values of x in our study are 0.20, 0.24 and 0.28. Characterization of these films by X-ray diffraction shows that the films exhibit tetragonal phase with perovskite structure. Dielectric, pyroelectric and ferroelectric studies carried out on these films have been reported and discussed. Dielectric constant of these films at room temperature varies from 78 to 90 while pyroelectric coefficient varies from 33 to 46 nC/cm²K. High pyroelectric figure of merit of PCT films have potential applications as pyroelectric sensor materials.