Abstract
CuO-doped (1–x)(Na0.2K0.8)NbO3-xBaZrO3 ceramics (0.0 ≤ x ≤ 0.06) were densified at 960°C. The ceramic with x = 0 exhibited a large sprout-shaped strain vs electric-field (S-E) curve and a double polarization vs electric-field (P-E) hysteresis curve, owing to the defect polarization (PD) developed between Cu2+ ions at Nb5+ sites and oxygen vacancies. The sizes of the S-E and P-E loops decreased with increasing x, owing to the decrease in the number of PDs. The ceramic with x = 0.04 displayed small S-E and P-E curves, indicating its small dielectric loss. It exhibited large strain (0.19% at 8.0 kV/mm) at room temperature, which was maintained at 200°C. A similar strain was observed after applying 106 cycles of an electric field (3.0 kV/mm). Hence, this specimen exhibited large strain with excellent thermal and fatigue properties. Moreover, the synthesized multilayer actuator using the ceramic with x = 0.04 showed excellent vibrational properties, making it promising for applications in multilayer piezoelectric actuators.
Original language | English |
---|---|
Pages (from-to) | 6837-6849 |
Number of pages | 13 |
Journal | Journal of the American Ceramic Society |
Volume | 102 |
Issue number | 11 |
DOIs | |
Publication status | Published - 2019 Nov 1 |
Keywords
- dielectric loss
- lead-free ceramics
- multilayers
- piezoelectric materials/properties
- strain
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry