Enhanced Energy Storage Properties of the Relaxor and Antiferroelectric Crossover Ceramic Enabled by a High Entropy Design.

In this work, we introduce a high entropy effect in designing a relaxor ferroelectric (RFE)-antiferroelectric (AFE) crossover ceramic by incorporating a high entropy relaxor-like oxide (PbBaSrCa)TiO with antiferroelectric NaNbO. The results show that the relaxor ferroelectricity of the system is enhanced with increasing NaNbO, and when the new composition reaches the highest configurational entropy, stable energy storage properties can be achieved. This is enabled by a high breakdown strength due to the small grain size and stable slim ferroelectric hysteresis loop with high efficiency due to entropy-stabilized short-range ordered polar nanoregions (PNRs). These findings showcase the potential of this strategy for exploiting new compositions of high-performance electrostatic capacitors.