1. Boosting energy-storage efficiency and thermal stability via defect dipoles in BaTiO3-based lead-free ceramics.
- Author
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Wang, C.Y., Liang, C., Cao, W.J., Zhao, H.Y., and Wang, C.C.
- Subjects
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THERMAL stability , *THERMAL efficiency , *LEAD-free ceramics , *RELAXOR ferroelectrics , *POWER density , *DIELECTRIC properties , *STRAY currents - Abstract
In this work, 0.3 wt% Mn-doped BaTiO 3 - x Bi(Mg 0.5 Hf 0.5)O 3 (BT- x BMH, x = 0.05–0.20) lead-free ceramics were prepared by solid-state reaction method. The structure, dielectric properties, energy-storage characteristics, and pulsed charge/discharge performance were investigated thoroughly. It was found that BMH doping leads to a phase-change from tetragonal to pseudocubic phase with enhanced relaxor behavior. Mn-doping can effectively suppress the leakage current via the associating of Mn2+ ions with oxygen vacancies. The sample of x = 0.15 displays superior dielectric thermal stability meeting the EIA-X9R standard. An optimal recoverable energy-storage density W rec = 3.1 J/cm3 at 255 kV/cm with boosted energy-storage efficiency η = 92.4% were realized in the sample. Moreover, this sample displays superior thermal and frequency stability with large power density (P D ∼ 80.3 MW/cm3) and ultra-fast transient discharge time (t 0.9 –34 ns). These characteristics suggest that the ceramic holds highly promising for high temperature capacitors and energy-storage applications. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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