Optimization of energy storage performance in NaNbO3-Based high entropy ceramics via MnO doping

Excellent comprehensive energy storage performance is essential to ensure a favorable application prospect for high entropy dielectric capacitors. In this work, the energy storage performance of 0.8(Na0.5Li0.5NbO3)-0.2 (Sr 0.5 Bi 0.5 )(Fe 0.5 Ti 0.25 Zr 0 .25 )O 3 ceramics with high entropy was improved by incorporating various contents of MnO. The results show that with the addition of MnO, the relaxation behavior is enhanced, significantly improving energy storage performance, and a recoverable energy density of 7.93 J/cm3 and energy efficiency of 90.6 % is achieved for [0.8(Na0.5Li0.5NbO3)-0.2(Sr0.5Bi0.5)(Fe0.5Ti0.25Zr0.25)O3]-0.05MnO under a 510 kV/cm electric field. Compared with non-MnO-doped ceramics, the size of the polar nanoregions (PNRs) is significantly reduced. It also shows remarkable stability to temperature and frequency. This study validates that integrating MnO effectively enhances the energy storage performance of high-entropy ceramics.