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Ceramic and electrical properties and crystal structures of the system Pb(Mgl/3Nb2/3- PbTiO3-PbZrO3 are described. The system is composed of three crystal phases at room temperature: pseudocubic, tetragonal, and rhombohedral. A high dielectric constant and radial coupling coefficient and low resonant resistance were obtained for the compositions near the morphotropic transformation. The composition Pb(Mgl/3Nb2/3)0.4375Ti0.4375Zr0.125O3 had the lowest temperature coefficient of resonant frequency.