Ceramic materials within particular ranges of the ternary system Pb(Li.sub.1/4 Nb.sub.3/4)O.sub.3 -PbTiO.sub.3 -PbZrO.sub.3 in solid solution form exhibit high dielectric constant along with high planar coupling coefficient, and are useful in electromechanical transducers. The ceramic materials are those within the area A, B, C, D, E and F and the area G, H, I, J and K of FIG. 2.
