High Breakdown Strength, Energy Density, And Fast Discharge Times In Plzst Films Achieved By Designed Double-Blocking Structures

In this work, the Pb0.97La0.02Zr0.85Sn0.12Ti0.03O3 (PLZST) antiferroelectric composite films with aluminum oxide (Al2O3) film as a double-blocking layer have been designed and successfully prepared via the sol-gel method. The energy storage characteristics, electrical properties, charge-discharge performance, and temperature stability of the composite films were studied systematically. As a result, by engineering the Al2O3 double-blocking layer on both sides of the antiferroelectric films, the breakdown strength of the composite films increases by 126% from 66.5 to 150.4 kV/mm and the recoverable energy storage density was significantly enhanced from 10.2 to 27.7 J/cm(3). Meanwhile, the discharge period has been measured as well, which is only 104 ns, resulting in a large peak current density of 180 A/cm(2) and an extremely high peak power density as high as 90 MW/cm(3) under 100 kV/mm. Furthermore, the composite films exhibited high temperature stabilities; the peak current density and the peak power density change is less than 15% when the temperature range varies from 30 to 100 degrees C. These results demonstrate that the PLZST films with double-blocking structures are promising candidates for pulse power applications.