Key Findings
The BNBST-0.08LMN ceramic achieves a recoverable energy density (Wrec) of 6.50 J/cm³ and a storage efficiency (η) of 86.42% at a moderate electric field of 450 kV/cm. The material demonstrates stable energy storage performance (ESP) and fast charge-discharge capabilities, with a t0.9 of approximately 45 ns.
Technical Details
The study utilizes high-entropy (HE) grain boundary engineering to fabricate (1- x)(Bi0.5Na0.5)0.7(Ba0.3Sr0.7)0.3TiO3 – x La(Mg2/3Nb1/3)O3 (BNBST-xLMN) ceramics. Key technical mechanisms include:
- Phase Competition: The incorporation of LMN increases configurational entropy, inducing phase competition. Phase-field simulations identified the x = 0.08 model as optimal for achieving low remnant polarization (Pr) and high maximum polarization (Pmax).
- Microstructural Control: Atomic-scale observations show the coexistence of short-range polar and long-range nonpolar regions, alongside randomly tilted oxygen octahedra, which reduces polarization anisotropy.
- Grain Boundary Engineering: Mg oxide compounds located within grain boundaries act as pinning centers. These centers refine grain size, improve insulation, and retard the propagation of electrical trees.
Background & Context
Dielectric capacitors are critical for pulsed-power applications due to their high power densities and fast discharge rates. While Bi0.5Na0.5TiO3 (BNT)-based ceramics offer high Pmax due to Bi3+-O2- hybridization, they typically suffer from low breakdown strength (Eb) and large hysteresis losses. Previous high-entropy designs have achieved ultrahigh ESP, but almost exclusively at extreme electric fields above 500 kV/cm, which poses reliability and safety risks for industrial equipment.
Significance & Outlook
By addressing the intrinsic tradeoff between Eb and ΔP (Pmax – Pr), this research provides a general route to enhancing ESP in BNT-based ceramics within the practically relevant moderate electric-field range of 200-500 kV/cm. This makes the material a viable candidate for industrial power systems where long-term reliability and safety are paramount.
Source: https://www.oaepublish.com/articles/microstructures.2026.235?to=comment
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