The crystalline properties of the (1x)BNT–xBKT ceramics were analyzed by X-ray diffraction (XRD, Bruker-AXS; New D8- Advance). The microstructure of the (1x)BNT–xBKT ceramics was observed by field emission scanning electron microscopy (FESEM, Carl Zeiss; SIGMA). The piezoelectric charge constant (d33) was measured by Berlin-court quasi-static meter and capacitance versus frequency (C–f) was obtained employing an impedance analyzer (Agilent; 4294 A) to obtain the dielectric constant (εr) and the electromechanical coupling factor (kp).