High electric energy and power density achieved in Pb_1−xLa_x[(Zr_0.55Sn_0.45)_0.92Ti_0.08]_1−x∕4O₃ antiferroelectric ceramics by La dopants

In order to improve the energy storage and discharge performance of ceramic dielectric capacitors, antiferroelectric materials have drawn wide attention. In this work, a comprehensive investigation on Pb_1−xLa_x[(Zr_0.55Sn_0.45)_0.92Ti_0.08]_1−x∕4O₃ (x = 0%, 2%, 4%, 6%) antiferroelectric ceramics are fabricated by a rolling process. With the addition of lanthanum(La), the average grain size and the electric-field-induced strain are suppressed. However, the energy conversion efficiency, particularly the efficiency of −60 °C, is enhanced with increasing La content. In addition, the released energy density calculated by the “quasi-static” method(W_re) and “dynamic” method(W_dis) were investigated comparatively. As the content of La increase, the discrepancy betweenW_re andW_dis gradually decreased. Specifically, the composition with 4%La doped has the best comprehensive performance, with the highest recoverable energy density of 5.61 J/cm³ and ultrahigh efficiency of 90% at 410 kV/cm. Moreover, a discharge energy density of 3.6 J/cm³ can be obtained at 222 kV/cm and 90% can be released in 0.68μs. By directly short experiment, a current density of 1599A/cm² and power density of 177 MW∕cm³ were obtained. These results indicated that PLZST 4/55/45/8 is promising for high electric energy and power density capacitors.