Abstract
AbstractCuO‐doped (1–x)(Na0.2K0.8)NbO3‐xBaZrO3ceramics (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 theS‐EandP‐Eloops decreased with increasing x, owing to the decrease in the number ofPDs. The ceramic with x = 0.04 displayed smallS‐EandP‐Ecurves, 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 106cycles 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.
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