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Thermally stable large strain in low‐loss (Na 0.2 K 0.8 )NbO 3 ‐BaZrO 3 for multilayer actuators
Author(s) -
Kim SunWoo,
Lee TaeGon,
Kim DaeHyeon,
Kim EunJi,
Kim Dae Su,
Kang WooSeok,
Jo Wook,
Lee Sang Jin,
Han Seung Ho,
Kang HyungWon,
Hong YounWoo,
Nahm Sahn
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16603
Subject(s) - materials science , electric field , natural bond orbital , ceramic , piezoelectricity , dielectric , hysteresis , polarization (electrochemistry) , analytical chemistry (journal) , dielectric loss , ion , composite material , mineralogy , condensed matter physics , optoelectronics , chemistry , physics , chromatography , quantum mechanics , density functional theory , computational chemistry , organic chemistry
CuO‐doped (1–x)(Na 0.2 K 0.8 )NbO 3 ‐xBaZrO 3 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 ( P D ) developed between Cu 2+ ions at Nb 5+ 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 P D s. 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 10 6 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.

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