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Large Strain in CuO-added (Na0.2K0.8)NbO3 Ceramic for Use in Piezoelectric Multilayer Actuators

Authors
Lee, Ji-HyunKim, Dae-HyeonSeo, In-TaeKim, Jong-HyunPark, Jong-SeongRyu, JunghoHan, Seung HoJang, Bo-yunNahm, Sahn
Issue Date
3월-2016
Publisher
WILEY
Citation
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, v.99, no.3, pp.938 - 945
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume
99
Number
3
Start Page
938
End Page
945
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/89325
DOI
10.1111/jace.14031
ISSN
0002-7820
Abstract
In this study, 1.0 mol% CuO-added (NaxK1-x)NbO3 (CNxK1-xN) ceramics with 0.0 x 0.5 were sintered at a relatively low temperature of 960 degrees C. A large Q(m) value (1750) was obtained for the specimens with x 0.2 owing to the hardening effect of Cu2+ ions, indicating that a large number of Cu2+ ions had replaced Nb5+ ions in these ceramics. The double polarization versus electric field (P-E) hysteresis loop was observed for the specimens with x 0.2, and was explained by the defect polarization (P-d) formed between Cu2+ ions and O2- vacancies. These specimens also exhibited a sprout-shaped strain versus electric field (S-E) curves with a large strain of 0.14%-0.15% at 8.0 kV/mm because of the internal bias field produced by P-d. For the CN0.2K0.8N ceramic, a double P-E hysteresis loop was maintained at 125 degrees C without remnant polarization. Moreover, this ceramic showed a large strain of 0.175% after 10(4) cycles when a high electric field of 8.0 kV/mm was continuously applied to the specimens during each cycles. Therefore, CN0.2K0.8N is a useful lead-free piezoelectric ceramic for multilayer actuators.
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