AbstractThe polycrystalline ternary ferroelectric ceramic of PMN-PYN-PT (PMN = PbMg1/3Nb2/3O3, PYN = PbYbl/3Nb2/3O3, PT = PbTiO3) were synthesized by conventional solid state reaction technique. The structural, electrical and energy-storage properties of the ceramic were investigated. X-ray diffraction studies reveal that the ceramic has a coexistence of both tetragonal and rhombohedral phases. Dielectric studies of the sintered samples were studied as a function of temperature ranging from room temperature to 400 °C and in the wide frequency range of 1–50 kHz which shows good relaxor behavior. P-E hysteresis loops for the ceramic confirm good ferroelectric properties, exhibiting at (Pr ∼ 17.5 µC cm−2, Ec ∼ 36.5 and Pm ∼ 20.3) were obtained for PMN-PYN-PT. Energy storage density (W) of 0.13 Jcm−3 was achieved at 50 kV/cm1. The optimum piezoelectric coefficient and piezoelectric voltage coefficient (d33 ∼ 412 pC/N, g33 ∼1.6) measured on the poled sample for PMN-PYN-PT, respectively. From these analyses, the reported ceramic is a promising candidate for energy-storage capacitor applications.