Abstract
(1-x)(Bi0.51Na0.47)0.94Ba0.06TiO3-xSm1/3TaO3 ceramics (abbreviated as BNTBT-xST) were fabricated by a conventional sintering technique, and their energy storage, dielectric and ferroelectric properties were investigated. With the doping of Sm3+ and Ta5+, the ceramics maintain the phase structure in which tetragonal (T) and rhombohedral (R) phases coexist. Moreover, after the introduction of ST, the grain size is reduced and the ferroelectric long-range order is broken, which contribute to the improvement in energy storage properties. Especially, the BNTBT-0.05ST ceramic achieves the excellent charging energy density (Wcha) of 1.90 J cm-3, discharging energy density (Wdis) of 1.59 J cm-3 and discharging efficiency (ƞ) of 84.2% under a low applied electric field (E) of 125 kV cm-1. More importantly, the ceramic also possesses superior durability of frequency (10 Hz–80 Hz) and temperature (25 °C–175 °C).
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