Enhanced energy storage in tungsten bronze-based ferroelectrics and MLCCs via a multi-coating engineering.
basic_science · Level V
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- Record sourced from PubMed, PMID 42477357.
- Also identified by DOI 10.1038/s41467-026-75708-z.
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Abstract
High-power pulsed systems demand dielectric capacitors with high energy density and efficiency. Although perovskite ceramics dominate this field, simultaneously achieving high performance and fatigue endurance remains a significant challenge. Our study addresses this aim by incorporating a Ba<sub>1-x</sub>Sr<sub>x</sub>TiO<sub>3</sub> second phase into tungsten bronze-type Ba<sub>1-x</sub>Sr<sub>x</sub>Nb<sub>2-y</sub>Ta<sub>y</sub>O<sub>6</sub> matrix, followed by chemical coating with a SiO₂ layer. The prepared ceramics achieve an energy density of 21.1 J/cm³ with an efficiency of 84.5%. Furthermore, by combining a rational multilayer ceramic capacitor design with the thickness effect, an energy density of 23.2 ± 1.2 J/cm³ and an improved efficiency of 92.8 ± 0.4% are attained, representing a record energy density for tungsten bronze-based ceramics and capacitors. The dual-core-shell structure and compositional gradients induce lattice mismatch, boosting polarization and breakdown strength. The fabricated devices also demonstrate remarkable stability under varying frequency, temperature, and fatigue cycling conditions.