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 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 ( VO⋅⋅ )-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-principl

SUBMITTER: Cai J 

PROVIDER: S-EPMC12041384 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature