High‐temperature dielectric and energy storage properties of Bi0.5Na0.5TiO3‐based ceramics modified by Sr0.8Na0.4Nb2O6

Abstract Sr 0.8 Na 0.4 Nb 2 O 6 with a tungsten bronze structure is introduced into perovskite‐structured 0.94(Bi 0.5 Na 0.5 )TiO 3 ‐0.06BaTiO 3 composition (abbreviated as BNT‐BT‐xSNN, x = 0‐0.04). The temperature stability of dielectric properties and energy storage performance is found to be effectively enhanced by Sr 0.8 Na 0.4 Nb 2 O 6 dopant. When x is 0.03, the temperature ranges covering | ε' ‐ ε' 150°C |/ ε' 150°C ≤15% and tanδ ≤ 0.02 are 43°C‐404°C and 90°C‐422°C, respectively. More importantly, ε′ can be retained as high as 3304 at 150°C. Besides, the variances of energy storage density and its efficiency are 6.4% and 5.3%, respectively, in the temperature range from room temperature (RT) to 180°C. Therefore, this work provides a new method of compositional modification in BNT‐based materials to improve their temperature stability of dielectric and energy storage properties.