Lead‐free Ag1−3xLaxNbO3 antiferroelectric ceramics with high‐energy storage density and efficiency. Issue 8 (4th February 2019)

• Record Type: Journal Article
• Authors: Luo, Nengneng; Han, Kai; Liu, Laijun; Peng, Biaolin; Wang, Xinpeng; Hu, Changzheng; Zhou, Huanfu; Feng, Qin; Chen, Xiyong; Wei, Yuezhou
• Is Part Of: Journal of the American Ceramic Society. Volume 102:Issue 8(2019)
• Page Start: 4640
• Page End: 4647
• Publication Date: 2019-02-04
• Subjects: dielectric materials/properties -- energy storage -- ferroelectricity/ferroelectric materials -- lead‐free ceramics; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.16309
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: Environmentally benign lead‐free bulk ceramics with high recoverable energy density ( W rec ) are very attractive in advanced pulsed power capacitors. In this work, composition engineering was adopted by La 3+ modification to improve the energy storage performance of Ag1−3 x La x NbO3 ceramics. It was found that the antiferroelectric (AFE) phase was stabilized after La 3+ substitution, as a result of the reduced tolerance factor t . Significant improvement of W rec and energy storage efficiency ( η ) were achieved with value of 3.12 J/cm 3 and 0.63 for x = 0.02 at an electric field of 230 kV/cm, more than 1.5 times the value of pure AgNbO3 ( W rec = 1.9 J/cm 3, η = 0.40). The excellent energy storage properties are resulted from the increased antiferroelectric‐ferroelectric phase transition electric field ( E F ), ferroelectric‐antiferroelectric phase transition electric field ( E A ), and breakdown electric field ( E b ). The enhanced E b was ascribed to the decreased grain size and increased electrical resistivity upon La 3+ modification. The feature makes Ag1−3 x La x NbO3 a potential candidate for energy storage applications.