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Jo, Wook
Sustainable Functional Ceramics Lab.
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Nanoscale ferroelectric/relaxor composites: Origin of large strain in lead-free Bi-based incipient piezoelectric ceramics

Author(s)
Dinh, Thi HinhKang, Jin-KyuLee, Jae-ShinKhansur, Neamul HayetDaniels, JohnLee, Hyun YoungYao, Fang-ZhouWang, KeLi, Jing-FengHan, Hyoung-SuJo, Wook
Issued Date
2016-11
DOI
10.1016/j.jeurceramsoc.2016.05.044
URI
https://scholarworks.unist.ac.kr/handle/201301/19997
Fulltext
http://www.sciencedirect.com/science/article/pii/S0955221916302928
Citation
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, v.36, no.14, pp.3401 - 3407
Abstract
La-doped (Bi0.5Na0.41K0.09)TiO3 ceramics were synthesized using a conventional solid-state reaction route. X-ray diffraction and electric-field-induced polarization studies revealed a phase transformation from a ferroelectric to a relaxor with increasing La content. Piezoresponse force microscopy and transmission electron microscopy indicated the coexistence of ferroelectric and relaxor phases at the morphotropic phase boundary (MPB). A normalized strain of 857 pm/V was observed at the MPB at 4 kV/mm, which is comparable to that of other macro ferroelectric/relaxor composite materials. We propose that the inherent nanoscale ferroelectric/relaxor composite in the La-doped (Bi0.5Na0.41K0.09)TiO3 ceramic be the origin of such giant electric-field-induced strain.
Publisher
ELSEVIER SCI LTD
ISSN
0955-2219
Keyword (Author)
Lead-free piezoceramicsStrainsDomain switchingRelaxorComposites
Keyword
TRANSMISSION ELECTRON-MICROSCOPYFREE PIEZOCERAMICSGIANT STRAINPHASE-TRANSITIONSFIELDTEMPERATUREEVOLUTIONBI0.5NA0.5TIO3-BATIO3-K0.5NA0.5NBO3ENHANCEMENTBEHAVIOR

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