© 2016 Trans Tech Publications, Switzerland. This study was conducted to find out the effect of particle sizes of BaTiO 3 (BT) seed on the microstructure and electrical properties of (Ba 0.85 Ca 0.15 )(Zr 0.1 Ti 0.9 )O 3 (BCZT) ceramics. The BT seeds were prepared by the molten salt method. The XRD patterns indicated that the BT seed powder showed a single pure perovskite phase when using a low temperature of ∼750°C. The particle sizes of BT seeds increased from ∼372 to ∼426 nm with increasing heating temperatures from 750 to 850°C. After that, the different BT seeds were mixed with BaCO 3 , CaCo 3 , ZrO 2 and TiO 3 from the solid state reaction method. The mixed powder was calcined and sintered at 1200 °C for 2 h and 1450 °C for 4 h, respectively. The microstructure, phase formation and electrical properties were investigated. All ceramic samples showed a pure perovskite phase. The density and average grain size values of ceramics were in the range of 5.36-5.47 g/cm3 and 9.83-11.86 μm, respectively. The highest values of dielectric constant (ϵ r ), piezoelectric constant (d 33 ) were 3393 and 452 pC/N, respectively which was obtained for the sample of BT-seed size 372 nm doped.