Abstract
Texturing is an effective method to improve the piezoelectric properties of lead-free piezoceramics. In the present study, textured (K,Na)NbO3-based piezoceramics with a Lotgering factor of 89.7% were successfully fabricated by the templated grain growth (TGG) method. Compared with its non-textured counterparts, great enhancements of the piezoelectric coefficient (50% improvement) and electromechanical coupling factor are observed in the textured samples. More importantly, electric-field-induced strain is also remarkably improved, as evident by a 17% higher large-signal piezoelectric coefficient (346 pm/V) of the textured sample. A relatively low strain deviation of 2% is observed between room temperature and 150 °C, and even up to 175 °C, 86% of their room temperature large-signal piezoelectric coefficient value is maintained. This temperature stability of textured (K,Na)NbO3-based piezoceramics is of great significance for actuators with a stable response over a broad temperature range.
Original language | English |
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Pages (from-to) | 389-398 |
Number of pages | 10 |
Journal | Acta Materialia |
Volume | 156 |
DOIs | |
Publication status | Published - 1 Sept 2018 |
Keywords
- Lead-free piezoceramics
- Piezoelectric properties
- Temperature stability
- Texture
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Polymers and Plastics
- Metals and Alloys