Colossal permittivity in high-entropy CaTiO3 ceramics by chemical bonding engineering
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 paramete...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2025-04-01
|
| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-025-59226-y |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | 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 (<± 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. |
|---|---|
| ISSN: | 2041-1723 |