Gigantic Electrostrain in Duplex Structured Alkaline Niobates
SCIE
SCOPUS
- Title
- Gigantic Electrostrain in Duplex Structured Alkaline Niobates
- Authors
- CHOI, SI YOUNG; Soon-Jong Jeong; Dae-Su Lee; Min-Soo Kim; Jae-Shin Lee; Jeong Ho Cho; Byoung Ik Kim; Yuichi Ikuhara
- Date Issued
- 2012-09-11
- Publisher
- AMER CHEMICAL SOC
- Abstract
- We demonstrate that an exceptionally large strain can be induced in CaZrO3-modified alkaline-niobates by electric fields. The maximum induced strain of our niobate-based ceramics could reach more than 1,000 pm/V, which is a much higher value than that of commercial soft PZT ceramics. Atomic-scale annular bright-field (ABF) and annular dark-field (ADF) scanning transmission electron microscopy (STEM) directly revealed that individual single grains were composed of an electrically duplex core shell structure; relaxor-like cores and paraelectric shells. Based on this ABF STEM analysis along with electrical measurements, a plausible mechanism explaining the high strain effect in the present work was suggested. This new material offers an unprecedented opportunity to produce efficient Pb-free piezoelectrics for applications that require large electrostrictive motion.
- Keywords
- core/shell; perovskites; electron microscopy; electric field induced strain; actuator
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/40892
- DOI
- 10.1021/cm301324h
- ISSN
- 0897-4756
- Article Type
- Article
- Citation
- CHEMISTRY OF MATERIALS, vol. 24, no. 17, page. 3363 - 3369, 2012-09-11
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