Thermally stable large strain in low-loss (Na0.2K0.8)NbO3-BaZrO3 for multilayer actuators
- Authors
- Kim, Sun-Woo; Lee, Tae-Gon; Kim, Dae-Hyeon; Kim, Eun-Ji; Kim, Dae Su; Kang, Woo-Seok; Jo, Wook; Lee, Sang Jin; Han, Seung Ho; Kang, Hyung-Won; Hong, Youn-Woo; Nahm, Sahn
- Issue Date
- 11월-2019
- Publisher
- WILEY
- Keywords
- dielectric loss; lead-free ceramics; multilayers; piezoelectric materials; properties; strain
- Citation
- JOURNAL OF THE AMERICAN CERAMIC SOCIETY, v.102, no.11, pp.6837 - 6849
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF THE AMERICAN CERAMIC SOCIETY
- Volume
- 102
- Number
- 11
- Start Page
- 6837
- End Page
- 6849
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/62100
- DOI
- 10.1111/jace.16603
- ISSN
- 0002-7820
- Abstract
- CuO-doped (1-x)(Na0.2K0.8)NbO3-xBaZrO(3) ceramics (0.0 <= x <= 0.06) were densified at 960 degrees 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 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 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 degrees 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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