10 mol% Pb(Fe1/2Nb1/2)O-3 (PFN) modified Pb(Mg1/3Nb2/3)O-3-PbZr0.52Ti0.48O3 (PMN-PZT) relaxor ferroelectric ceramics with compositions of (0.9 - x)PMN-0.1 PFN-xPZT (x = 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8 and 0.9) were prepared. X-ray diffraction investigations indicated that as-prepared ceramics were of pure perovskite phase and the sample with composition of x = 0.8 was close to morphotropic phase boundary (MPB) between rhombohedral and tetragonal phase. Dielectric properties of the as-prepared ceramics were measured, and the Curie temperature (T-c) increased sharply with increasing PZT content and could be higher than 300 degrees C around morphotropic phase boundary (MPB) area. At 1 kHz, the sample with composition of x = 0.1 had the largest room temperature dielectric constant epsilon(r) = 3519 and maximum dielectric constant epsilon(m) = 20,475 at T-m while the sample with composition of x = 0.3 possessed the maximum dielectric relaxor factor of gamma = 1.94. The largest d(33) = 318 pC/N could be obtained from as-prepared ceramics at x = 0.9. The maximum remnant polarization (P-r = 28.3 mu C/cm(2)) was obtained from as-prepared ceramics at x = 0.4. (C) 2011 Elsevier Ltd. All rights reserved.