Logro de un rendimiento superior de almacenamiento de energía en cerámicas PLZST a través de una estrategia de...

Dielectric capacitors featuring high energy density and excellent temperature stability are vital to the miniaturization and reliability of high-power electronic systems. Antiferroelectrics (AFEs) exhibit high polarization through field-induced phase transition. However, their antiferroelectric-ferroelectric phase transition electric field (E_AFE-FE) usually exceeds the dielectric breakdown strength, severely restricting their practical energy storage capability. To address this issue, we propose an antiferroelectric/relaxor ferroelectric composite strategy that effectively reduces the E_AFE-FE by tuning the phase transition energy barrier, thereby facilitating field-induced polarization switching. The Pb_0.94La_0.04(Zr_0.84Sn_0.15Ti_0.01)O₃/2 wt % 0.8Ba(Zr_0.1Ti_0.9)O₃-0.2 Bi(Zn_2/3Ta_1/3)O₃ (PLZST/2BZT) composite ceramics exhibit a high recoverable energy storage density (W_rec) of 9.3 J cm^-3 and an energy storage efficiency (η) of 85% when subjected to a breakdown electric field of 325 kV cm^-1. This remarkable performance is owing to the reduced phase transition energy barrier and the enhanced interfacial polarization, which collectively strengthen polarization response. Notably, the PLZST/2BZT ceramics also exhibit exceptional temperature stability, maintaining W_rec above 6.5 J cm^-3 and η invariably surpassing 81% over a broad temperature range of -20 to 140 °C under a 320 kV cm^-1 electric field. These results highlight the effectiveness of the AFE/relaxor ferroelectric composite strategy for achieving high-performance dielectric ceramics, providing valuable insights into the design of high-performance capacitors for advanced dielectric materials and high-power electronic devices.