Enhancement of Energy Storage Performance in NaNbO3-Modified BNT-ST Ceramics

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Relaxor ferroelectrics based on sodium bismuth titanate (Bi0.5Na0.5TiO3, BNT) have attracted more interest recently as potential ecologically acceptable materials for pulse power technology because of their excellent full-energy storage capabilities. This paper formed (1 − x){0.97[0.98(BNT-ST)-0.02CN]-0.03AlN}-xNN ceramics through a traditional solid-state reaction process. It was noted that the incorporation of NaNbO3 enhances the property of energy storage by elevating the breakdown strength and causing the creation of an ergodic relaxation state. The effective energy storage density (Wrec) and the energy storage efficiency (η) are 1.09 J/cm3 and 85%, respectively. The breakdown field strength Eb reached 155 kV/cm at x = 40%. These ceramics have excellent temperatures and frequency stabilities from 0.5 to 50 Hz and 20 to 60 °C.