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Effects of sintering method on the structural,dielectric and energy storage properties of AgNbO3 lead-free antiferroelectric ceramics |
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| Authors: | Li Tianyu Cao Wenjun Chen Pengfei Wang Jinsong Wang Chunchang |
| Affiliation: | 1.Laboratory of Dielectric Functional Materials, School of Physics & Materials Science, Anhui University, Hefei, 230601, China ;2.State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing, 100084, China ; |
| Abstract: | In this work, we systematically investigated the effects of single-step and two-step sintering methods on the structural, dielectric and energy storage properties of pure AgNbO3 lead-free antiferroelectric ceramics. Compared with the single-step sintered ceramic, the ceramic prepared by two-step sintering method has smaller grain size, dense and homogeneous microstructure. In addition, the results of dielectric temperature spectra reveal that the two-step sintering method hardly changes the phase transition temperature of AgNbO3 ceramics but greatly decreases the dielectric loss value. Most importantly, the ceramic prepared by the two-step sintering method displays high breakdown electric field strength (22 kV/mm), larger recoverable energy storage density-Wrec (2.59 J/cm3) and higher energy storage efficiency-η (45%) as well as excellent temperature stability than those of the ceramic by single-step sintering method. Furthermore, it also exhibited high power density (PD?=?25.7 MW/cm3) and extremely fast charge–discharge speed (25 ns). Our results provide a simple and novel way to design high-performance AgNbO3-based energy storage lead-free ceramics. Graphical abstract |
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