Abstract
In this study, potassium bismuth titanate–barium titanate (KBT–BT)-based lead-free piezoelectric perovskite ceramic material is synthesized via conventional solid state reaction method. The structural, morphological, ferroelectric, piezoelectric and dielectric properties are analyzed using suitable characterizations and their potential for energy storage application is validated. Rietveld refinement on powder X-ray diffraction patterns revealed that the sintered KBT–BT ceramics belong to tetragonal system with P4mm space group at room temperature. The morphology of the sample was observed to be inhomogeneous with abnormal grain growth. The KBT–BT ceramics showed excellent dielectric and ferroelectric properties (ɛr = 2916; Pr = 17.40 µC/cm2, Ec = 39.97 kV/cm). Particularly polarization hysteresis (P–E) loops recorded at ambient temperature resulted in a high recoverable energy storage density (Wrec ~ 0.61 J cm3) and exhibited extremely high efficiency (η ~ 39.3%) at 1 Hz. Large accompanying normalized strains of ~ 46% corresponding to a strain d33 of 83 pm/V were observed.
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