Abstract
Lead-free (1-x) [0.934BNT-0.07KNN]-x SrTiO3/BNT-KNN-ST ceramics with x = 0, 0.04, 0.08, 0.12 and 0.16 were synthesized in single perovskite phase by conventional solid state reaction route. Effect of SrTiO3 modification on phase, microstructure, dielectric, electric field induced polarization, electric field induced strain and energy-storage properties were investigated and discussed in detail. Dielectric study confirmed relaxor nature with a drastic decrease of Tc with the increase of SrTiO3 content in BNT-KNN-ST system. Saturation polarization, remnant polarization, coercive field (Ec) and maximum induced strain decreased with the increase of SrTiO3 content in BNT-KNN-ST system. High recoverable energy storage density of ~0.59 J/cm3 with energy storage efficiency of ~64% were obtained in x = 0.16 ceramic samples, which suggested its usefulness for energy-storage capacitor applications.
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