Enhanced depolarization temperature in 0.90NBT–0.05KBT–0.05BT ceramics induced by BT nanowires. (March 2015)

• Record Type: Journal Article
• Authors: Cao, W.P.; Li, W.L.; Feng, Y.; Xu, D.; Wang, W.; Hou, Y.F.; Zhang, T.D.; Fei, W.D.
• Is Part Of: Journal of physics and chemistry of solids. Volume 78(2015:Mar.)
• Page Start: 41
• Page End: 45
• Publication Date: 2015-03
• Subjects: A. Ceramics -- C. X-ray diffraction -- D. Dielectric properties; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2014.10.004
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract: The depolarization temperature ( T d ) of piezoelectric materials is an important figure of merit for their application at elevated temperatures. This study focuses on the effect of BaTiO3 (BT) nanowires on T d and piezoelectric properties of morphotropic-phase-boundary 0.90NBT–0.05KBT–0.05BT ceramics. The results reveal that BaTiO3 nanowires can pin the domain wall, leading to the increase of coercive field ( E c ) from 21.06 kV/cm to 34.99 kV/cm. The T d value of 0.90NBT–0.05KBT–0.05BT ceramics can be enhanced approximately 20 °C when using BT nanowires instead of BT solution as the raw material. Meanwhile, at the same polarization conditions, the piezoelectric constant of the ceramic added BT nanowires (172 pC/N) is decreased but still remains a larger value compared with those of other lead-free ceramics. The results imply that the addition of BT nanowires into NBT–KBT is a very effective route to improve T d . Highlights: The T d of 0.90NBT–0.05KBT–0.05BT ceramic can be enhanced about 20 °C when added BT nanowires. BT nanowires can increase the E c of 0.90NBT–0.05KBT–0.05BT ceramic from 21.06 kV/cm to 34.99 kV/cm. The d 33 of 0.90NBT–0.05KBT–0.05BT ceramic is 172 pC/N when BT nanowires instead of BT solution.