A high-tolerance BNT-based ceramic with excellent energy storage properties and fatigue/frequency/thermal stability. Issue 17 (1st December 2019)

• Record Type: Journal Article
• Authors: Wang, Hua; Hu, Qiang; Liu, Xiaoqin; Zheng, Qiaoji; Jiang, Na; Yang, Yang; Kwok, K.W.; Xu, Chenggang; Lin, Dunmin
• Is Part Of: Ceramics international. Volume 45:Issue 17(2019)Part B
• Page Start: 23233
• Page End: 23240
• Publication Date: 2019-12-01
• Subjects: Bi0.5Na0.5TiO3 -- Solid solution -- Energy storage properties -- Thermal stability -- Fatigue -- Frequency; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.08.019
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: A novel perovskite lead-free solid solution of (Ba0.06 Bi0.47 Na0.47 )1- x La x Ti1- y Zr y O3 were designed by dual-substitution of La 3+ and Zr 4+ for (Ba0.06 Bi0.47 Na0.47 ) 2+ and Ti 4+ . The frequency-, temperature- and fatigue-dependent energy storage properties of the materials were investigated. After the dopings of La 3+ and Zr 4+, the crystal structure of the ceramics remains unchanged; and tetragonal and rhombohedral phases coexist in all ceramics which exhibit a relaxor phase transition. The co-substitution of La 3+ and Zr 4+ leads to the high dielectric breakdown strength (DBS), large spontaneous polarization ( P s ) and small remnant polarization ( P r ) of the materials. The optimum energy storage properties are achieved at x / y = 0.02/0.04, giving high recoverable energy storage density of W rec ~1.55 J/cm 3, excellent energy storage efficiency of ƞ ~72.6% and large dielectric breakdown strength of DBS ~136 kV/cm. Furthermore, the ceramic with x / y = 0.02/0.04 possesses superior durability of frequency (~2–60 Hz), fatigue (~ 10 3 ) and temperature (~ 25–245 °C).