High energy storage performance of KNN-based relaxor ferroelectrics in multiphase-coexisted superparaelectric state

Although K0.5Na0.5NbO3 (KNN) possesses large maximum polarization and relatively high breakdown strength, the large remnant polarization constrains their practical applications as energy storage materials. In this work, through multi-element doping, (K0.5−0.5xNa0.5−0.5xBix)(Nb1−xSn0.2xZn0.6xTa0.2x)O...

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Bibliographic Details
Published in:Journal of applied physics 2024-08, Vol.136 (7)
Main Authors: Zha, Jielin, Yang, Yulong, Liu, Jiaxun, Lu, Xiaomei, Hu, Xueli, Yan, Shuo, Wu, Zijing, Zhou, Min, Huang, Fengzhen, Ying, Xuenong, Zhu, Jinsong
Format: Article
Language:English
Subjects:
Energy storage
Ferroelectric materials
Ferroelectricity
Multiphase
Polarization
Relaxors
Room temperature
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Summary:Although K0.5Na0.5NbO3 (KNN) possesses large maximum polarization and relatively high breakdown strength, the large remnant polarization constrains their practical applications as energy storage materials. In this work, through multi-element doping, (K0.5−0.5xNa0.5−0.5xBix)(Nb1−xSn0.2xZn0.6xTa0.2x)O3 relaxor ferroelectrics were prepared. As the superparaelectric states (SPE) were adjusted to room temperature, orthorhombic, tetragonal, and cubic phases coexisted, accompanied by the highly dynamic polar nanoregions (PNRs). In particular, a high recoverable energy storage density of 4.5 J/cm3 and an energy storage efficiency of 83% were achieved for the x = 0.125 ceramic, with the variations less than 11% and 4%, respectively, in the wide temperature range of 20–180 °C. These results demonstrate that the multiphase PNRs in the SPE state is an effective strategy for improving the energy storage performance of KNN-based ceramics.
ISSN:0021-8979
1089-7550
DOI:10.1063/5.0220887