Improving energy storage performance enabled by composition-induced dielectric behavior in PbHfO3-based ceramics under low electric fields

Abstract

Antiferroelectric ceramics with high energy storage performance at low electric fields appear to be particularly important to meet the requirements of miniaturized devices with a high level of integration. In this work, Ti-doped PbHfO₃ antiferroelectric ceramics were fabricated via a solid-state method. The PbHf_0.99Ti_0.01O₃ bulk ceramics exhibit excellent energy storage performance (W_rec = 5.49 J cm⁻³ at 200 kV cm⁻¹) and high property stability (<5% over 20 °C–120 °C and 1–100 Hz), accompanied by the stabilization of the ferroelectric state. Based on the results of XRD refinement and numerical study, we found that the enlarged displacement space of B-site cations accounts for the enhanced polarization at a low electric field. PbHf_0.09Ti_0.01O₃ ceramics exhibited giant potential in energy storage applications at low electric fields.