Phase-pure perovskite powders in the Pb(Fe2/3W1/3)O-3-Pb(Mg1/3Nb2/3)O-3 system were synthesized by a B-site precursor method and were densified into ceramic form. Lattice parameter changes were examined as a function of composition. Sinterability was studied by measuring bulk densities of the fired ceramic specimen. Composition- and frequency-dependent weak-field dielectric properties in the low frequency range are reported. Curie temperatures shifted linearly with composition change, while the maximum dielectric constants did not show a linear relationship.