The elastic, piezoelectric, and dielectric properties of tetragonal 0.65Pb(Mg1/3Nb2/3)O-3-0.35PbTiO(3) (PMN-35%PT) single crystals were determined. The piezoelectric constant d(33) is similar to 1250 pC/N; the electromechanical coefficients k(15), k(31), k(33), and k(t) are 0.70, 0.48, 0.91, and 0.61, respectively. The dielectric properties were measured as a function of temperature for (001)-oriented crystals. Compared with the crystals with compositions in the morphotropic phase boundary, PMN-35%PT crystals have much more stable phase structure from room temperature to Curie temperature, which makes them promising materials for high power applications in fabricating transducers, actuators, and generators. (c) 2006 American Institute of Physics.