Dielectric and Ferroelectric Properties of SrTiO3–Bi0.5Na0.5TiO3–BaAl0.5Nb0.5O3 Lead-Free Ceramics for High-Energy-Storage Applications

Pulsed capacitors require high-recoverable energy-storage density ( W rec ) and high energy-storage efficiency (η), which can be realized through the selection and adjustment of the composition. In this work, (1 – x )SrTiO 3 – x (0.95Bi 0.5 Na 0.5 TiO 3 –0.05BaAl 0.5 Nb 0.5 O 3 ) [(1 – x )ST– x (BNT–BAN)] ceramics were successfully prepared via the pressureless solid-state reaction method. The dielectric constant increases gradually with the introduction of BNT–BAN and obtains a maximum value of 3430 with the composition of 0.4ST–0.6(BNT–BAN) at 100 Hz, which is 10.39 times higher than that of the pure ST sample (∼330). Dispersive relaxor behaviors and ferroelectric performances can be enhanced with the introduction of BNT–BAN. The composition of 0.5ST–0.5(BNT–BAN) exhibits a high W rec of 1.89 J/cm 3 as well as a high η of 77%. Therefore, the (1 – x )ST– x (BNT–BAN) systems are candidate materials for pulsed capacitor applications.