A new compositional system of relaxor ferroelectrics was investigated based on the high piezoelectricity Pb(Zn1/3Nb2/3)O-3-PbTiO3 ferroelectric perovskite family. Compositions were fabricated near an estimated morphotropic phase boundary (MPB) of the Pb(Lu1/2Nb1/2)O-3-Pb(Zn1/3Nb2/3)O-3-PbTiO3 (PLZNT) ternary system by a two-step synthetic process. Their structures have been analyzed by means of X-ray diffraction technique. On the basis of X-ray powder diffraction, the morphotropic phase boundary (MPB) region for the ternary system was obtained. The Curie temperature T-c of ternary system varied from 240 degrees C to 330 degrees C and the coercive fields E(c)s > 10 kV/cm. The values of piezoelectric coefficients d(33) vary in the range of 260-450 pC/N with different PZN contents. It is worth noting that the optimum compositions were located at MPB region but near the tetragonal phase. The new PLZNT ceramics exhibit wider range of T(c)s and E(c)s, making it a promising material for high-powder ultrasound transducers using in a large temperature range. (C) 2013 Elsevier Ltd. All rights reserved.