Colossal permittivity in high-entropy CaTiO3 ceramics by chemical bonding engineering

作者：Jinghan Cai, Shun Lan, Bin Wei, Junlei Qi, Ce‐Wen Nan, Yuanhua Lin · 发表于：Nature Communications · 年份：2025 · DOI：10.1038/s41467-025-59226-y · 被引用次数：34 · 研究领域：Dielectric properties of ceramics、Ferroelectric and Piezoelectric Materials、Microwave Dielectric Ceramics Synthesis

Dielectrics with high permittivity, low dielectric loss, and good temperature stability are crucial for electronic components to meet the ever-increasing application demands. However, challenges remain in further optimizing dielectric properties due to the correlation between these parameters. Here, we propose a chemical bonding engineering strategy in high-entropy CaTiO3 ceramics and realize colossal permittivity with low loss and excellent stability. Our results reveal that the high-concentration oxygen vacancy ( $${{{\rm{V}}}}_{{{\rm{O}}}}^{\cdot \cdot }$$ )-related defects and the decreased activation energy of grain/grain boundary led to a colossal permittivity dielectric behavior, which should be ascribed to the weakened chemical bonding and the reduced formation energy of defects confirmed by our first-principles calculation. Consequently, in the high-entropy CaTiO3 ceramic, a permittivity of 2.37 × 105, low loss of 0.005, and good temperature stability (<± 15%) in -50–250 °C are simultaneously achieved. This finding implies that chemical bonding engineering may be a promising strategy for designing colossal permittivity materials and provides a broad opportunity for the development of other defect-dependent functional materials. A chemical bonding engineering strategy is proposed in this work to realize the improvement of dielectric performance. A colossal permittivity of 2.37 × 105 and a low loss of 0.005 are ultimately achieved in high-entropy CaTiO3-based ceramics.