文献类型：期刊文献

英文题名：Significant enhancement of ferroelectric performance in lead-free NaNbO3 ceramics

作者：Li, Zekun[1];Xun, Wenhao[2];Huang, Xiaohua[2,3];Wan, Youhe[1];Liu, Yaochen[1];Gu, Siyu[1];He, Wenbo[1];Yang, Weixue[1];Lin, Zhiming[1];Wang, Baoyuan[1];Hou, Ying[1,4]

机构：[1]East China Univ Sci & Technol, Sch Phys, Shanghai 200237, Peoples R China;[2]Xiamen Univ Technol, Sch Optoelect & Commun Engn, Xiamen 361024, Peoples R China;[3]Fujian Key Lab Optoelect Technol & Devices, Xiamen 361024, Peoples R China;[4]Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China

年份：2024

卷号：50

期号：19

起止页码：36487

外文期刊名：CERAMICS INTERNATIONAL

收录：;EI(收录号：20242816670529);WOS:【SCI-EXPANDED(收录号:WOS:001293807700001)】；

基金：The authors acknowledge the financial support by National Natural Science Foundation of China (Grant Nos. 52272109, 91963116, and 11904304) , Natural Science Foundation of Shanghai (Grant No. 19ZR1411900) , Natural Science Foundation of Fujian Province (Grant Nos 2021J011218) , and State Key Laboratory of Powder Metallurgy, Central South University, Changsha, China.

语种：英文

外文关键词：Lead-free ceramics; Sintering aids; Ferroelectric properties; NaNbO3

摘要：The comparable free energy between antiferroelectric (AFE) and ferroelectric (FE) phases in NaNbO3 (NN) leads to unstable ferroelectricity, restricting future applications for energy storage devices. In this work, lead-free NN ceramics based on different sintering aids have been rigorously synthesized and the microstructural, dielectric, and ferroelectric properties of this system have been thoroughly examined. It is found that a tiny amount of sintering aids effectively lowers the sintering temperature and manipulates the grain growth, as well as plays an essential role in the stability of FE phase in NN ceramics. The tunable ferroelectricity is observed in NN: CuO as sintering aids results in a hardening effect, whereas MnO2 addition promotes softening behavior. More interestingly, introducing 1 wt% MnO2 as sintering aids results in strong ferroelectricity with high polarization (Pm) of 84.6 mu C/cm2 stabilized by a stimulated electric field (Ef) as low as 60 kV/cm. This is significantly better than other NN-based ceramics (Pm is smaller than 40 mu C/cm2 and Ef is higher than 90 kV/cm in the NN-based systems reported earlier). Our findings demonstrate the potential of sintering aids in tailoring the ferroelectric performance of lead-free NN ceramics, offering insights into the development of environmentally friendly ferroelectric materials.