(Bi1/6Na1/6Ba1/6Sr1/6Ca1/6Pb1/6)TiO3-based high-entropy dielectric ceramics with ultrahigh recoverable energy density and high energy storage efficiency

The unique atom configuration in high-entropy dielectric ceramics gives rise to high P max , small P r . Accordingly, ultrahigh recoverable energy density of 8.8 J cm −3 and high η of 92.5%, as well as excellent thermal stability, are achieved.