Dielectric properties and phase transition behaviors of Sr-doped 0.8PbZr(1/2)Ti(1/2)O(3)-0.2PbNi(1/3)Nb(2/3)O(3) ceramics have been investigated. The ceramics were prepared by a normal solid-state method. For undoped sample, very high relative permittivity >30,000 (at 1 kHz) was observed at the transition temperature of 278 degrees C. With increasing Sr concentration, the degree of diffuse phase transition was enhanced and a linear reduction in the transition temperature was produced. (c) 2007 Elsevier B.V. All rights reserved.