Dielectric properties and energy storage capability of antiferroelectric Pb_0.92La_0.08Zr_0.95Ti_0.05O₃ film-on-foil capacitors

Antiferroelectric (AFE) Pb_0.92La_0.08Zr_0.95Ti_0.05O₃ (PLZT) films were grown on nickel foils with lanthanum nickel oxide buffer by chemical solution deposition. We observed field-induced AFE-to-ferroelectric (FE) phase transition. The electric field for the AFE-to-FE phase transition (E_AF ≈ 270 kV/cm) and that for the reverse phase transition (E_FA ≈ 230 kV/cm) were measured at room temperature on samples with PLZT films of ≈1-µm thickness. Relative permittivity of ≈560 and dielectric loss of <0.05 were measured near zero DC bias field. Hysteresis loop analysis showed that energy densities of ≈53 and 37 J/cm³ can be stored and recovered from the film-on-foil capacitors at 25 and 150 °C, respectively. Highly accelerated life tests were conducted. The projected mean time to failure is >5000 h when the capacitors are operated at room temperature with an applied field of ≈300 kV/cm.