Pb-0.99(Zr0.95Ti0.05)(0.98)Nb0.02O3 ferroelectric ceramics doped with Sm2O3 were prepared and the influence of Sm2O3 doping levels on the microstructures, the dielectric, ferroelectric, piezoelectric properties as well as fracture toughness was investigated. When the doping concentration of Sm2O3 spans from 0 to 7.5 at.%, the maximum permittivity decreases from similar to 20,000 to similar to 5000, the remnant polarization from 35 to 4 mu C/cm(2), the d(33) from 67 pC/N to 8 pC/N, while the fracture toughness of the ceramics are enhanced to 2.1 MPa m(1/2). From the viewpoint of microstructure tailoring for the energy storage density control, the doped ceramics realized an optimization between the tailored electrical properties and the high mechanical properties, which is promising to substitute porous PZT in pulsed power supply. (C) 2013 Elsevier Ltd. All rights reserved.