High strain and high energy density of lead-free (Bi0.50Na0.40K0.10)0.94Ba0.06Ti(1−x)(Al0.50Ta0.50)xO3 perovskite ceramics

Abstract

Lead-free perovskite materials for capacitors have been recognized worldwide attention in recent times with high storage energy density and efficiency. A series of (Bi0.50Na0.40K0.10)0.94Ba0.06Ti(1−x)(Al0.50Ta0.50)xO3 ceramics are synthesized using traditional mixed oxide route. All ceramics are in single-phase perovskite-like structure. At room temperature, high storage energy density, Wr ~ 1.67 J/cm3, and conversion efficiency, η ~ 81.46%, are perceived for x = 0.06 composition at 115 kV/cm. Temperature-dependent study obtains Wr ~ 1.21 J/cm3 and η ~ 84.96% at 80 °C with 80 kV/cm field. In addition, composition x = 0.06 is fatigue-free from 1 to 105 cycles measured at 80 kV/cm field. Furthermore, ceramic x = 0.04 is obtained a high bipolar strain ~ 0.31% at 80 kV/cm compared to other compositions. Hence, the compositions x = 0.06 for high energy density and x = 0.04 for strain might be useable in many electronic components.