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

Sr0.8Na0.4Nb2O6 with a tungsten bronze structure is introduced into perovskite-structured 0.94(Bi0.5Na0.5)TiO3-0.06BaTiO(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 Sr0.8Na0.4Nb2O6 dopant. When x is 0.03, the temperature ranges covering |epsilon'-epsilon'(150 degrees C)|/epsilon'(150 degrees C) <= 15% and tan delta <= 0.02 are 43 degrees C-404 degrees C and 90 degrees C-422 degrees C, respectively. More importantly, epsilon ' can be retained as high as 3304 at 150 degrees 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 degrees 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.