The microstructures and pyroelectric properties of multicomposition 0.9PbZrO(3).xPbTiO(3).(0.1-x)Pb(Zn1/3Nb2/3)O-3 (PZPT-PZN) ceramics were investigated. The PZ-PT-PZN ceramics with nearly theoretical density were prepared by spark plasma sintering at low temperature (800degreesC) for a very short time (10 min) from two original compositions with x = 0.025 and x = 0.050. The heat treatment was successfully used to control the diffusion between the different compositions in such ceramics. For ceramics heat-treated at 900degreesC, two pyroelectric peaks corresponding to the original compositions were observed. When the heat-treatment temperature was increased to 1200degreesC, these two pyroelectric peaks combined into one sharp pyroelectric peak, which corresponds to average composition. When the spark-plasma-sintered ceramics were heat-treated at 950degreesC, a high and stable pyroelectric coefficient (>100 nC.cm(-2).K-1) over a wide temperature range (23degrees-47degreesC) was obtained. It was found that the pyroelectric properties strongly depended on the microstructures.