Significantly enhanced energy storage density in sodium bismuth titanate-based ferroelectrics under low electric fields |
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| Affiliation: | 1. Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China;2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;3. School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China;4. State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China |
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| Abstract: | Bi0.5Na0.5TiO3 (BNT)-based ferroelectrics have received more and more attention due to their environment-friendliness and large maximum polarization. Herein, the enhanced energy-storage properties of BNT-based ceramics were successfully prepared by introducing multi-ions (La3+, K+, Al3+, Nb5+, Zr4+) to improve the breakdown strength and simultaneously suppress the remnant polarization. An excellent discharge energy-storage density (Wd) of 3.24 J cm−3 and a high energy-storage efficiency (η) of 82 % under 200 kV cm-1 have been recorded for Bi0.44La0.06(Na0.82K0.18)0.5Ti0.90(Al0.5Nb0.5)0.08Zr0.02O3 ceramic. Meanwhile, the outstanding thermal stability with Wd of 1.84–1.96 J·cm−3 were also achieved in 25−125 °C at 140 kV cm-1. More importantly, piezoresponse force microscopy reveals that the threshold voltage for inducing long range order enhances while the stability of polar nanoregions (PNRs) on the nanoscale decreased with the increase of La doping amount, leading to more linear polarization behavior and higher energy-storage properties. These results promote the practical applications of BNT-based ferroelectrics in advanced pulsed power systems. |
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| Keywords: | Lead-free dielectric ceramics Energy storage properties Breakdown strength Domain |
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