Abstract
The large maximum polarization P max and low remnant polarization P r in relaxor ferroelectrics are key features for the energy storage density (W) and energy-storage efficiency (η) in materials selection. In this study, the ergodic relaxor (ER) state with high energy storage performance associated with low P r and large P max, induced by Sr0.85Bi0.1TiO3(SBT) addition in (1 − x)Bi0.5Na0.5TiO3-xSr0.85Bi0.1TiO3 (BNT-SBTx with x = 0.25–0.45, Bi0.5Na0.5TiO3 abbreviated as BNT) ceramics has been observed. In particular, significantly increased energy storage density (W = 1.5 J/cm3) and energy-storage efficiency (η = 73%) are obtained for BNT-SBT ergodic relaxor ceramics. These results suggest a new means of designing lead-free energy-storage materials.
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