Abstract
Na0.5Bi0.5TiO3-based ceramics are considered to be a prospective material for energy storage applications due to their unique phase transition and crystal structure. However, the large remanent polarization (Pr) and coercive field (Ec) limit their application in energy storage devices. In this work, the composition-dependent structure, dielectric properties and energy storage properties of Bi(Mg2/3Nb1/3)O3 (BMN) modified Na0.5Bi0.5TiO3-NaNbO3 (NBTNN) ceramics were systematically investigated. The introduction of BMN promotes the formation of local random field, which effectively suppresses the hysteresis loss along with Pr, and form “slender” P-E hysteresis loops. The maximum recoverable energy density of 5.26 J/cm3 is obtained in the optimum composition 0.8NBTNN-0.2BMN, which is about three times more than that of the undoped one, while yielding a high energy efficiency of 78%. In addition, the introduction of BMN into NBTNN ceramic results in excellent temperature stability and significant enhancement in band gap of the material. The improved energy storage performance of BMN modified NBTNN ceramic indicates their potential applicability in dielectric capacitors.
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