Structure and energy storage performance of Ba-modified AgNbO3 lead-free antiferroelectric ceramics. Issue 5 (1st April 2019)

• Record Type: Journal Article
• Authors: Han, Kai; Luo, Nengneng; Jing, Yang; Wang, Xinpeng; Peng, Biaolin; Liu, Laijun; Hu, Changzheng; Zhou, Huanfu; Wei, Yuezhou; Chen, Xiyong; Feng, Qin
• Is Part Of: Ceramics international. Volume 45:Issue 5(2019)
• Page Start: 5559
• Page End: 5565
• Publication Date: 2019-04-01
• Subjects: AgNbO3 -- Antiferroelectric -- Energy storage -- Tolerance factor; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.12.014
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The AgNbO3 antiferroelectric (AFE) ceramics have attracted increasing attention for their high energy storage performance and environmentally friendly characters. In this work, Ag1–2 x Ba x NbO3 ceramics were successfully prepared by the conventional solid-state reaction method. The effect of Ba-modification on phase structure, microstructure, and electric properties was systematically investigated. The introduction of Ba 2+ ion led to complex cell parameter evolution and significant refinement of grain size. Room temperature dielectric permittivity increased obviously from ~260 for the pure AgNbO3 counterpart to ~350 for those after adding a small amount of Ba element. Slim P-E hysteresis loops with improved AFE phase were achieved after Ba modification, due to the decrease of tolerance factor. A high recoverable energy density up to 2.3 J/cm 3 with energy efficiency of 46% can be obtained for the composition of Ag0.96 Ba0.02 NbO3, in correlation with the enhanced AFE stability, reduced P r, increased P m and decreased Δ E . Moreover, the Ag0.96 Ba0.02 NbO3 ceramics also exhibited excellent temperature stability in both energy density and efficiency with small variation of < 5% over 20–120 ℃. The results suggest that the electric properties of AgNbO3 system can be largely tuned after Ba modification, making it a promising candidate for energy storage applications.