Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5437275 | Ceramics International | 2017 | 30 Pages |
Abstract
Piezoelectric sensors and energy harvesters require piezoelectric materials with large piezoelectric responses and good thermal stability. However, a commonly accepted concept is that the promotion of depolarization temperature of Bi1/2Na1/2TiO3-based lead-free ceramics is usually companied by deterioration of piezoelectric properties. In the present study, the effects of acceptor-Fe doping on piezoelectric property and thermal depolarization behavior of Bi1/2(Na0.8K0.2)1/2TiO3 ceramics are investigated. Fe doping at an appropriate level (⤠3.0%) improves piezoelectric property and thermal stability simultaneously, due to the stabilization of long-range ferroelectric order. Piezoelectric constant d33 increases from 125 pC/N to 148 pC/N with Fe amount of 3.0%, and then decreases. The depolarization temperature Td is promoted continuously with Fe addition, from 76 °C for the undoped sample to 118 °C for the sample with Fe amount of 5.0%. It is proposed that the piezoelectric property and thermal stability can be simultaneously improved by stabilizing the long-range ferroelectric order in Bi1/2Na1/2TiO3-based systems with obvious relaxor character. This work provides a new insight into the improvement of Bi1/2Na1/2TiO3-based lead-free piezoelectric ceramics.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Huazhang Zhang, Jing Zhou, Jie Shen, Xiong Yang, Chenglong Wu, Kunkun Han, Zehong Zhao, Wen Chen,