The dielectric properties and phase transition behaviors of antiferroelectric-antiferroclectric (1-x)Pb(Yb1/2Ta1/2)O-3-xPbZrO(3) [(1-x)PYT-xPZ] solid solution system (0.0 less than or equal to x less than or equal to 0.10) have been studied by X-ray diffraction, permittivity and E-P hysteresis measurement. With increasing the PbZrO3 amount, the initially split Bragg peaks (400) and (440) begin to merge into single lines. The temperature of the secondary phase transition of (1-x)PYT-xPZ whose character is relaxor-like decreases rapidly rather than that of the first order transition whose character is frequency independent with increasing the PbZrO3 addition. From the E-P hysteresis loop measurement, the remanent polarizations and the coercive field of the system go to zero as the temperature and Zr4+ concentration increase. (C) 2003 Elsevier Ltd. All rights reserved.