Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 5, Pages 6097-6104Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b20803
Keywords
energy storage; AgNbO3; lead-free; phase transition; structural heterogeneity
Funding
- International Collaboration Project of NSFC [51761135118]
- ARC [FT140100698]
- Basic Science Center Project of NSFC [51788104]
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AgNbO3-based antiferroelectric ceramics have been actively studied for energy-storage applications, where numerous compositional modifications have been implemented to improve their energy-storage performance. In this work, Sm2O3-doped AgNbO3 ceramics were fabricated; the microstructure, dielectric property, and phase transition behavior were investigated. Because of the structure heterogeneity induced by the rare-earth dopant, a diffused antiferroelectric-to-paraelectric phase transition was observed. High-resolution transmission electron microscopy observations confirm the existence of a local pseudo-rhombohedral structure consisting of different lattice orderings, being responsible for the local nanoscale heterogeneity. Of particular significance is the fact that the Sm3+ dopant effectively decreases the dielectric loss and increases the critical antiferroelectric-ferroelectric phase transition electric field, leading to a high energy-storage density of 4.5 J/cm(3).
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