Lead scandium tantalate (PST) ceramic has been shown [1, 2] to be a ferroelectric material with the perovskite Pb(BiB2)03 structure, and having a first order phase transition at 25-30°C. The material has a reversible pyroelectric effect under bias, and it has been fully assessed for thermal detector applications [3]. More recently, the properties of a solid solution of (l-x)PST - (x)PbTiO3have been reported [4, 5]; for an x value of 0.4, the Curie temperature was increased to 182°C and the maximum dielectric constant was 30×103. This paper presents results of a study into the solid solution (l-x)PST - (x)PbZrO3, (0.075x0.20), and in particular discusses the optimum ceramic process route for obtaining a dielectric exhibiting a sharp phase transition, a high maximum dielectric constant and a low dielectric loss.