Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 40, Pages 36824-36830Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b10819
Keywords
barium titanate; lead-free; relaxor ferroelectrics; domain; energy-storage properties
Funding
- National Natural Science Foundation of China [51572159]
- Shaanxi Science AMP
- Technology Co-ordination AMP
- Innovation Project of China [2017TSCXL-GY-08-05]
- Science Fund for Distinguished Young Scholars of Shaanxi Province [2018JC-029]
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Barium titanate-based energy-storage dielectric ceramics have attracted great attention due to their environmental friendliness and outstanding ferroelectric properties. Here, we demonstrate that a recoverable energy density of 2.51 J cm(-3) and a giant energy efficiency of 86.89% can be simultaneously achieved in 0.92BaTiO(3)-0.08K(0.73)Bi(0.09)NbO(3) ceramics. In addition, excellent thermal stability (25-100 degrees C) and superior frequency stability (1-100 Hz) have beenobtained under 180 kV cm(-1). The first-order reversal curve method and transmission electron microscopy measurement show that the introduction of K0.73Bi0.09NbO3 makes ferroelectric domains to transform into highly dynamic polar nanoregions (PNRs), leading to the concurrently enhanced energy-storage properties by the transition from ferroelectric to relaxor ferroelectric (RFE). Furthermore, it is confirmed by piezoresponse force microscopy that the appearance of PNRs breaks the long-range order to some extent and reduces the stability of the microstructure, which explains the excellent energy-storage performance of RFE ceramics. Therefore, this work has promoted the practical application ability of BaTiO3-based energy-storage dielectric ceramics.
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