Preparation and Electric Properties of Bi 0.5 Na 0.5 TiO 3 – Bi ( Al 0.5 Ga 0.5 ) O 3 Lead‐Free Piezoceramics

• Published in: Journal of the American Ceramic Society Vol. 96; no. 12; pp. 3793 - 3797
• Main Authors: Wang, Qi, Chen, Jun, Fan, Longlong, Song, Huidong, Gao, Wei, Rong, Yangchun, Liu, Laijun, Fang, Liang, Xing, Xianran
• Format: Journal Article
• Language: English
• Published: 01.12.2013
• ISSN: 0002-7820; 1551-2916
• DOI: 10.1111/jace.12588

A new lead‐free BNT ‐based piezoelectric ceramics of (1 −  x ) Bi 0.5 Na 0.5 TiO 3 – x Bi ( Al 0.5 Ga 0.5 ) O 3 ( x  = 0, 0.02, 0.03, 0.04, and 0.05) were synthesized using a conventional ceramic fabrication method. Their structures and electrical properties were investigated. All the samples show a typical ferroelectric P ( E ) loops and S ( E ) curves at room temperature. The optimal properties are obtained at the composition of the x  = 0.03. The substitution of Bi ( Al 0.5 Ga 0.5 ) O 3 enhances piezoelectric constant and increases Curie temperature from 58 pC/N and 310°C of pure BNT to 93 pC/N and 325°C of the x  = 0.03. The temperature‐dependent P ( E ) loops and S ( E ) curves of 0.97BNT–0.03BAG indicate that phase transition from ferroelectric to antiferroelectric takes place over a very wide temperature region from 80°C to 180°C. The results show that the introduction of BAG improves the electrical properties of BNT .