@article{He2025, 
author = {Shuang He and Kunjie Lou and Bing Han and Shaobo Guo and Fei Cao and Chunhua Yao and Yizheng Bao and Genshui Wang},
title = {Superior energy storage density and efficiency in antiferroelectric-like BNT-based ceramics via single-element phase engineering},
year = {2025},
journal = {Journal of Advanced Ceramics},
volume = {14},
number = {4},
pages = {9221056},
keywords = {Bi0.5Na0.5TiO3 (BNT)-based ceramics, single rare earth ion doping, energy storage performance, antiferroelectric-like relaxor behavior},
url = {https://www.sciopen.com/article/10.26599/JAC.2025.9221056},
doi = {10.26599/JAC.2025.9221056},
abstract = {Bi0.5Na0.5TiO3 (BNT) has received much attention because of its excellent dielectric properties for pulsed power systems. Most of the work has focused on inducing the relaxation behavior of BNT-based materials by doping with multiple elements, but the preparation method is complicated because a high maximum polarization (Pmax) is sacrificed, which affects the energy storage properties. In this work, we induced antiferroelectric-like relaxor behavior by replacing Bi3+ with the single rare-earth ion Pr3+ to obtain highly active polar nanoregions (PNRs) that increase the energy storage efficiency (ƞ). In addition, the 6s2 lone pair of electrons of Pr3+ can produce large ionic displacements similar to those of Bi3+. This could maintain the contribution of the A-site polarization to possess large Pmax. Moreover, the high energy gap (Eg) and reliability increase the breakdown electric field (Eb). Consequently, the ultrahigh recoverable energy storage density (Wrec) of 11.01 J/cm3 at 552 kV/cm and η of 86.7% are achieved with (Bi0.5−xPrxNa0.5)TiO3 component (BPNT-18), which is superior to many other multielement components. It also has fast charging and discharging speeds (t0.9 ≈ 37 ns) and high power densities (PD ≈ 312 MW/cm3). This research proposes a simple and effective approach in which a single element is used to obtain excellent energy storage performance in lead-free dielectric ceramics.}
}