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

Jinghan Cai, Shun Lan, Bin Wei, Junlei Qi, Ce-Wen Nan and Yuan-Hua Lin ()
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Jinghan Cai: Tsinghua University
Shun Lan: Tsinghua University
Bin Wei: Tsinghua University
Junlei Qi: Tsinghua University
Ce-Wen Nan: Tsinghua University
Yuan-Hua Lin: Tsinghua University

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: Abstract 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 ( $${{{\rm{V}}}}_{{{\rm{O}}}}^{\cdot \cdot }$$ V O ⋅ ⋅ )-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 (

Date: 2025
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DOI: 10.1038/s41467-025-59226-y

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