Domain evolution and improved electrical property of BiMn2/3Nb1/3O3 doped 0.8Na0.5Bi0.5TiO3-0.2K0.5Bi0.5TiO3. Issue 6 (15th April 2020)

• Record Type: Journal Article
• Authors: Li, Ling; Fang, Di; Wang, Rui-Xue; Hao, Jigong; Gu, Zheng-Bin; Zhang, Shan-Tao
• Is Part Of: Ceramics international. Volume 46:Issue 6(2020)
• Page Start: 7947
• Page End: 7953
• Publication Date: 2020-04-15
• Subjects: NKBT -- Domain engineering -- Electrical property; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.12.015
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: (1- x )[0.8Na0.5 Bi0.5 TiO3 -0.2K0.5 Bi0.5 TiO3 ]- x BiMn2/3 Nb1/3 O3 ((1- x )NKBT- x BMN with x = 0–0.04) piezoceramics were prepared, the composition-dependent domain structure and domain switching under electric field and their effects on macroscopic electrical properties have been systematically investigated. At room temperature, though the ceramics persists rhombohedral-tetragonal mixed crystal structure, their domain structure evolves from dispersive island-like with average size of 80 nm for x = 0 to labyrinthian-like with average size of 120 nm for x = 0.0075, and then tends to be unobservable by forming polar nanoregions for x = 0.04. As the results, the x = 0.0075 ceramic shows enhanced ferroelectric and piezoelectric property. When compared with the x = 0 pristine counterpart, the saturated polarization, remnant polarization, piezoelectric coefficient, and electromechanical coupling factor of x = 0.0075 ceramic increase by 3%, 12%, 40%, and 20% to 43.2 μC/cm 2, 31.2 μC/cm 2, 147 pC/N, and 0.28. This work suggests that fine domain engineering is a promising way to further improve electrical property.