Effect of excess lead addition on processing of sol-gel derived lanthanum-modified lead zirconate titanate thin film

Sol-gel-derived lanthanum-modified lead zirconate titanate (PLZT) thin film s with a La/Zr/Ti ratio of 10/65/35 and a lead lanthanum titanate (PLT) thi n seeding layer were successfully deposited on an indium tin oxide (ITO)-co ated soda lime glass substrate at 500 degrees C. Effects of excess lead add ition of different concentrations in the precursor solution on the electric al properties of the resultant PLZT thin films were investigated. As a resu lt, the relative permittivity increased and the dissipation factor decrease d with the increase of excess lead concentration. Excess lead of 30 mol% wa s indispensable for obtaining PLZT thin film with good ferroelectricity. In addition, the resultant films showed more than 60% transmittance in the vi sible region.