Achieving excellent energy storage properties and temperature stability in BNT-BT-BS ceramics under low electric field
Applied Surface Science, ISSN: 0169-4332, Vol: 697, Page: 163011
2025
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Article Description
Bi 0.5 Na 0.5 TiO 3 -BaTiO 3 (BNT-BT) relaxor ferroelectric system has been highly regarded for its superior performance. BiScO 3 (BS) component was added into BNT-BT to construct medium entropy (1.53R < 1.61R) ternary ferroelectric ceramics for the excellent energy storage performance. The effect of BS on the energy storage performance for BNT-BT ceramics were investigated systematically. Indeed, the introduction of BS causes the reduction of ferroelectric long-range order and delayed polarization saturation, which results from a higher maximum polarization ( Pmax ) and reduced remanent polarization ( Pr ) after the increase of entropy value. Meanwhile, twice firing porcelain method was employed to refine the grains and improve the breakdown electric field strength ( Eb ). Currently, Eb of the 0.60BNT-0.21BT-0.19BS (BNT-BT-0.19BS) ceramic are improved to 200 kV/cm, the recoverable energy density Wre c is 4.22 J/cm 3, and the efficiency η is 86.83 %. It also maintains excellent temperature stability ( ΔWrec %≤2.2 % within the temperature range of 25 ∼ 150 °C) and fatigue resistance ( ΔWrec ≤ 0.03 J/cm 3 after 10 6 cycles). Especially, BNT-BT-0.19BS ceramic has good charging-discharging characteristics, with a t0.9 of 84 ns at room temperature. Appropriate increase of ΔSconfig in ferroelectrics is beneficial for improving energy storage characteristics, this provides guidance for designing high-performance lead-free dielectric energy storage materials.
Bibliographic Details
Elsevier BV
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