High strain and high energy density of lead-free (Bi_0.50Na_0.40K_0.10)_0.94Ba_0.06Ti_(1−x)(Al_0.50Ta_0.50)_xO₃ perovskite ceramics

Lead-free perovskite materials for capacitors have been recognized worldwide attention in recent times with high storage energy density and efficiency. A series of (Bi_0.50Na_0.40K_0.10)_0.94Ba_0.06Ti_(1−x)(Al_0.50Ta_0.50)_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, W_r ~ 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 W_r ~ 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.