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- Title
Optimizing K 0.5 Na 0.5 NbO 3 Single Crystal by Engineering Piezoelectric Anisotropy.
- Authors
Li, Weixiong; Chen, Chunxu; Xie, Guangzhong; Su, Yuanjie
- Abstract
K0.5Na0.5NbO3 is considered as one of the most promising lead-free piezoelectric ceramics in the field of wearable electronics because of its excellent piezoelectric properties and environmental friendliness. In this work, the temperature-dependent longitudinal piezoelectric coefficient d 33 * was investigated in K0.5Na0.5NbO3 single crystals via the Landau–Ginzburg–Devonshire theory. Results show that the piezoelectric anisotropy varies with the temperature and the maximum of d 33 m a x * deviates from the polar direction of the ferroelectric phase. In the tetragonal phase, d 33 m a x t * parallels with cubic polarization direction near the tetragonal-cubic transition region, and then gradually switches toward the nonpolar direction with decreasing temperatures. The maximum of d 33 o * in the orthorhombic phase reveals a distinct varying trend in different crystal planes. As for the rhombohedral phase, slight fluctuation of the maximum of d 33 r * was observed and delivered a more stable temperature-dependent maximum d 33 m a x r * and its corresponding angle θmax in comparison with tetragonal and orthorhombic phases. This work not only sheds some light on the temperature-dependent phase transitions, but also paves the way for the optimization of piezoelectric properties in piezoelectric materials and devices.
- Subjects
SINGLE crystals; PIEZOELECTRIC ceramics; PIEZOELECTRIC thin films; ANISOTROPY; PIEZOELECTRIC devices; PIEZOELECTRIC materials; LEAD-free ceramics
- Publication
Nanomaterials (2079-4991), 2021, Vol 11, Issue 7, p1753
- ISSN
2079-4991
- Publication type
Article
- DOI
10.3390/nano11071753