Abstract
In this work, a novel high entropy perovskite oxide (1–x)(Na0.2Bi0.2Ba0.2Sr0.2Ca0.2)TiO3-xNaNbO3 (abbreviated as (1–x)NBBSCT-xNN, 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/cm3, together with wide temperature stable stability (CT−C25°CC25°C < 15%, –70 to 110 °C), excellent frequency stability (Wrec and η vary by only ± 2.1% and ± 5.2% within the range of 1–600 Hz) and fast discharge rate (t0.9 = 55.2 ns). This is mainly due to the enhancement of relaxation behavior and increase of Eb 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.
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