Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5440751 | Journal of the European Ceramic Society | 2017 | 14 Pages |
Abstract
Recently developed Bi0.5Na0.5TiO3(BNT)-based piezoceramics face two urgent obstacles: high driving field required to trigger large strain and poor temperature stability. Highly oriented (1-x)(0.83Bi0.5Na0.5TiO3-0.17Bi0.5K0.5TiO3)-xNaNbO3 (BNT-BKT-xNN) piezoceramics were synthesized using NN templates to resolve both obstacles. Measurements of polarization and strain hysteresis loops as well as phase transition temperature revealed a phase evolution from ergodic relaxor to ferroelectric phases, generating a high strain of 0.43% and large Smax/Emax = 720pm/V for textured BNT-BKT-4NN ceramics. The field-dependent strain was largely depended on the degree of texturing. Most intriguingly, grain-oriented specimens provided excellent actuating performance characterized by both large Smax/Emax = 693 pm/V at a low driving field of 45 kV/cm and enhanced temperature stability with Smax/Emax = 537pm/V at 120 °C. This was basically ascribed to the facilitated switching between ergodic relaxor and ferroelectric phases owing to the grain-oriented structure. As a consequence, design of <00l> oriented microstructure opens the possibility to produce efficient BNT-based piezoceramics for transferral into real-world applications.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Wangfeng Bai, Daqin Chen, Peng Zheng, Junhua Xi, Yang Zhou, Bo Shen, Jiwei Zhai, Zhenguo Ji,