LAUSR

The investigation of the microstructure and electrical properties of lead-free (1 − x)(0.92BaTiO3–0.08K0.5Bi0.5TiO3)–xKNbO3 ceramics where x = 0, 0.005, 0.01, 0.02, 0.04, 0.06, 0.08 and 0.10 was carried out. (1 − x)BTKBT–xKN ceramics were prepared by conventional solid state reaction method. The XRD patterns revealed change in crystal symmetries from tetragonal to pseudocubic structure with increasing KN contents. In addition, dielectric constant and dielectric loss versus frequency were characterized in the frequency range from 1 kHz to 1 MHz. It is found that the dielectric constant and the dielectric loss changed with the increase of KN contents regularly. The Curie temperature of (1 − x)BTKBT–xKN composite is dependent on the KN content, which confirms the XRD results. Energy storage density and energy storage efficiency were calculated from polarization versus electric field hysteresis loops. Value of energy storage efficiency increased with the increase of KNbO3 content. A relatively large energy storage density of 0.89 J/cm3 was obtained in the x = 0.08 samples.