Wet chemistry produced niobium modified PZT 95/5 was synthesised and processed for use in a ferroelectric power supply. The electrical performance of ferroelectric power supply components can be characterised by the remnant polarisation for the material, which is found to follow closely with density. The effects of doping the wet chemistry derived oxide powder with additional PbO via a traditional mixed oxide route were assessed as a function of density and remnant polarisation. The results have shown a gradual improvement followed by a sharp deterioration in density and electrical properties as PbO additions increase and exceed a certain level. As a result of lead volatilisation during subsequent processing steps, the actual lead content for the optimum PbO dopant level was in the region of theoretical stoichiometry, which in part concludes the findings of this study. Further conclusions are made in reference to the effect of excessive PbO on the material’s processing characteristics.