High-Entropy-Induced Polarization Discontinuity Enabling Ultrahigh and Temperature-Stable Energy Storage in Ceramic Capacitors.
basic_science · Level V
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- Record sourced from PubMed, PMID 42396889.
- Also identified by DOI 10.1002/adma.73913.
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Abstract
The development of multilayer ceramic capacitors (MLCCs) with high-energy storage performance over a wide temperature range is critical for practical applications but remains challenging. Here, we propose a high-entropy design to disrupt the long-range ferroelectric order of tetragonal tungsten bronze (TTB) ceramics, inducing a polarization discontinuity composed of coexisting polar nanoregions and non-polar regions. This unique configuration delays polarization saturation while minimizing hysteresis loss through electrostatic interactions. Consequently, the TTB-based MLCC achieves a high recoverable energy density (W<sub>rec</sub>) of 15.8 J cm<sup>-3</sup> and an ultrahigh energy efficiency (η) of 97.5%, yielding a record-high figure of merit of 632 J cm<sup>-3</sup> for TTB-based ceramic capacitors. Furthermore, the MLCC exhibits outstanding thermal stability from 25°C to 150°C, maintaining W<sub>rec</sub> ≈ 13.04 ± 0.41 J cm<sup>-3</sup> and η ≈ 95.43 ± 2.61%. The high-entropy-induced polarization discontinuity offers valuable insights into polarization modulation and provides an effective strategy for designing next-generation high-performance dielectrics.