Abstract
(1-x)Bi0·5(Na0·8K0.2)0.5TiO3/xNaNbO3 (x = 0–0.1) ceramics are prepared through solid-state reaction. The incorporation of NaNbO3 leads to slight crystal distortion with nanoscale particle size, improving the relaxor phenomenon by destruction of the original ferroelectric long-range order, which finally contributes to the enhanced energy storage density and efficiency. Particularly, the outstanding energy storage properties are observed at x = 0.075 with well thermal, frequency and cycle stability. Moreover, the highest energy storage density and efficiency are obtained at ∼160 °C with x = 0.075. Further, the well charge-discharge performance is also achieved. These results indicate that designing Bi0·5(Na0·8K0.2)0.5TiO3-based relaxor ferroelectrics through NaNbO3 is an effective method to realize excellent energy storage performance in dielectric capacitors.
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