Abstract
AbstractDielectric ceramics with a high recoverable energy density (Wrec) and high efficiency are desirable for the development of pulsed power capacitors under low electric fields. In this study, through the introduction of SrSc0.5Nb0.5O3 into (Bi0.5Na0.5Ti0.95Al0.025Nb0.025O3) [(1‐x)BNTA‐xSSN], a considerable recoverable energy storage density (Wrec) of approximately 2.7 J/cm3 and energy storage efficiency (η) of approximately 76 % at 210 kV/cm are achieved at x = .1; additionally, η is further improved to 85 % at x = .2. Moreover, η and Wrec of .9BNTA‐.1SSN exhibit outstanding stability (thermal and frequency stability) at 150 kV/cm, which is superior to that of other lead‐free ceramics. The excellent energy storage performance is attributed to the increased relaxation degree and the formation of ferroelectric nanodomains, whereas the enhanced Eb is ascribed to the increased electrical resistivity and decreased grain size upon modification. These results indicate the potential of (1‐x)BNTA‐xSSN as an ideal candidate for energy‐storage applications.
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