Enhanced capacitive energy storage and dielectric temperature stability of A-site disordered high-entropy perovskite oxides

In this work, a novel high entropy perovskite oxide (1-x )(Na 0.2 Bi 0.2 Ba 0.2 Sr 0.2 Ca 0.2 )TiO 3 - x NaNbO 3 (abbreviated as (1-x )NBBSCT- x NN, x = 0, 0.05, 0.1, 0.15, and 0.2) was designed to improve temperature dielectric stability and energy storage performance by combining relaxor and antiferroelectric characteristics. The optimal composition of x = 0.2 exhibits a high energy storage density of 3.51 J/cm 3 , together with wide temperature stable stability ( C T - C 25 degrees C by only +/- 2.1% and +/- 5.2% within the range of 1-600 Hz) and fast discharge rate ( t 0.9 = 55.2 ns). This is mainly due to the enhancement of relaxation behavior and increase of E b caused by the decrease of grain size. These results offer a new strategy for designing high entropy ceramic materials of high performance in the future. (c) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.