@article{Ma2024, 
author = {Li Ma and Zhenpei Chen and Gengguang Luo and Zhiyi Che and Chao Xu and Dongliang Shan and Zhenyong Cen and Qin Feng and Xiyong Chen and Toyohisa Fujita and Ye Zhu and Yunya Liu and Jing-Feng Li and Shujun Zhang and Nengneng Luo},
title = {High energy storage density in NaNbO3 antiferroelectrics with double hysteresis loop},
year = {2024},
journal = {Journal of Materiomics},
volume = {10},
number = {5},
pages = {1026-1035},
keywords = {Sodium niobate, Antiferroelectrics, Double hysteresis loop, Energy storage performance, Reversibility},
url = {https://www.sciopen.com/article/10.1016/j.jmat.2023.11.003},
doi = {10.1016/j.jmat.2023.11.003},
abstract = {Antiferroelectrics (AFEs) possess great potential for high performance dielectric capacitors, due to their distinct double hysteresis loop with high maximum polarization and low remnant polarization. However, the well-known NaNbO3 lead-free antiferroelectric (AFE) ceramic usually exhibits square-like P–E loop related to the irreversible AFE P phase to ferroelectric (FE) Q phase transition, yielding low recoverable energy storage density (Wrec). Herein, significantly improved Wrec up to 3.3 J/cm3 with good energy storage efficiency (η) of 42.4% was achieved in Na0.7Ag0.3Nb0.7Ta0.3O3 (30Ag30Ta) ceramic with well-defined double P–E loop, by tailoring the A-site electronegativity with Ag+ and B-site polarizability with Ta5+. The Transmission Electron Microscope, Piezoresponse Force Microscope and in-situ Raman spectra results verified a good reversibility between AFE P phase and high-field-induced FE Q phase. The improved stability of AFE P phase, being responsible for the double P–E loop and improved Wrec, was attributed to the decreased octahedral tilting angles and cation displacements. This mechanism was revealed by synchrotron X-ray diffraction and Scanning Transmission Electron microscope. This work provides a good paradigm for achieving double P–E loop and high energy storage density in NaNbO3-based ceramics.}
}