Dielectric temperature stability and energy storage performance of NBT‐based ceramics by introducing high‐entropy oxide

In this study, a high‐entropy perovskite oxide Sr(Zr 0.2 Sn 0.2 Hf 0.2 Ti 0.2 Nb 0.2 )O 3 (SZSHTN) was first introduced to Na 0.5 Bi 0.5 TiO 3 (NBT) lead‐free ferroelectric ceramics to boost both the high‐temperature dielectric stability and energy storage performance. Excellent comprehensive performance was simultaneously obtained in the 0.8NBT–0.2SZSHTN ceramic with high ε ′ value (> 2000), wide ε ′‐temperature stable range (TCC < 5%, 52.4–362°C), low tan δ value in a wide range (<0.01, 90–341°C) and high energy storage performance ( W rec = 3.52 J/cm 3 , W rec and η varies ±6.08% and ±7.4% from 20 to 150°C), which endows it the promising potential to be used in high‐temperature environments.