Thermally stable high strain and piezoelectric characteristics of (Li, Na, K)(Nb, Sb)O-3-CaZrO3 ceramics for piezo actuators
- Authors
- Lee, Ku-Tak; Lee, Tae-Gon; Kim, Sun-Woo; Chae, Seok-June; Kim, Eun-Ji; Kim, Jeong-Seog; Choi, Ji-Won; Nahm, Sahn
- Issue Date
- 10월-2019
- Publisher
- WILEY
- Keywords
- lead-free ceramics; phase transition; piezoelectric materials; properties; strain; thermal properties
- Citation
- JOURNAL OF THE AMERICAN CERAMIC SOCIETY, v.102, no.10, pp.6115 - 6125
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF THE AMERICAN CERAMIC SOCIETY
- Volume
- 102
- Number
- 10
- Start Page
- 6115
- End Page
- 6125
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/62604
- DOI
- 10.1111/jace.16503
- ISSN
- 0002-7820
- Abstract
- The 0.97(Na0.5K0.5)(Nb1-xSbx)O-3-0.03CaZrO(3) ceramic with x = 0.09 exhibits a high d(33) of 518 pC/N and a strain of 0.13% at 4.0 kV/mm owing to its orthorhombic-pseudocubic polymorphic phase boundary (PPB) structure. However, these values decreased considerably above 90 degrees C owing to its low Curie temperature (T-C), indicating that its thermal stability is not sufficient for practical applications. Li2O was added to the specimen with x = 0.11 to improve its thermal stability of the strain and d(33) by increasing the T-C without degrading the actual d(33) and strain values. The 0.97(Li0.04Na0.46K0.5)(Nb0.89Sb0.11)O-3-0.03CaZrO(3) ceramic, having an orthorhombic-tetragonal PPB structure, exhibits a d(33) of 502 pC/N and a strain of 0.16%. This large strain was maintained up to 150 degrees C and the d(33) slightly decreased to 475 pC/N at 130 degrees C. Therefore, this lead-free ceramic displays excellent piezoelectric characteristics with improved thermal stability, indicating that it can be applied to piezoelectric actuators.
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Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
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