Remarkably enhanced energy-storage density and excellent thermal stability under low electric fields of (Na0.5Bi0.5)TiO3-based ceramics via composition optimization strategy |
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| Authors: | Zepeng Wang Ruirui Kang Lixue Zhang Pu Mao Qinzhao Sun Fang Kang Jiping Wang |
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| Affiliation: | 1. State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi''an Jiaotong University, Xi’an, 710049, China;2. Frontier Institute of Science and Technology, State Key Laboratory for Mechanical, Behavior of Materials, Xi’an Jiaotong University, Xi’an, 710049, China |
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| Abstract: | High energy density and high thermal stability of energy-storage properties (ESP) under low electric fields are extremely crucial for the application of dielectric ceramics in miniaturized equipment. In present work, we use a composition-optimization approach to break the long-range ferroelectric order and modulate polar nanoregions (PNRs) in the local structure of (1-x)[0.7(Na0.5Bi0.5)TiO3-0.3(Sr0.7Bi0.2)TiO3]-xBi(Mg0.5Ti0.5)O3 system. The large Pmax value is maintained due to the existence of Bi ions in both the matrix and dopants. As a result, a high Wrec of 3.03 J/cm3 together with a moderate η of 79.5 % was obtained in x = 0.05 sample at a low electric field of 200 kV/cm. Meanwhile, the high Wrec (2.41–2.52 J/cm3) and excellent thermal stability of ESP (Wrec varying less than 4.3 % and η > 90 %) from 50 °C to 200 °C at 150 kV/cm were also observed. The current system will be a promising candidate in energy-storage capacitor applications under low-fields and high-temperature. |
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| Keywords: | Energy storage properties Polar nanoregions Thermal stability |
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