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Jo, Wook
Sustainable Functional Ceramics Lab
Research Interests
  • Lead-free piezoceramics, ultra - low temperature sintering, ferroelectrics, relaxor ferroelectrics, 2D materials, magnetoelectric materials, multiferroics

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Cyclic electric field response of morphotropic Bi1/2Na1/2TiO3-BaTiO3 piezoceramics

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Title
Cyclic electric field response of morphotropic Bi1/2Na1/2TiO3-BaTiO3 piezoceramics
Author
Hinterstein, M.Schmitt, L. A.Hoelzel, M.Jo, WookRoedel, J.Kleebe, H. -J.Hoffman, M.
Issue Date
2015-06
Publisher
AMER INST PHYSICS
Citation
APPLIED PHYSICS LETTERS, v.106, no.22, pp.222904
Abstract
In this study, the evolution of field induced mechanisms in lead-free piezoelectric ceramics (1-x)Bi1/2Na1/2TiO3-xBaTiO(3) with x = 0.06 and 0.07 was investigated by transmission electron microscopy, neutron, and X-ray diffraction. Preliminary investigations revealed a strong degradation of macroscopic electromechanical properties within the first 100 bipolar electric cycles. Therefore, this structural investigation focuses on a comparative diffraction study of freshly prepared, poled, and fatigued specimens. Transmission electron microscopy and neutron diffraction of the initial specimens reveal the coexistence of a rhombohedral and a tetragonal phase with space group R3c and P4bm, respectively. In situ electric field X-ray diffraction reveals a pronounced field induced phase transition from a pseudocubic state to a phase composition of significantly distorted phases upon poling with an external electric field of 4 kV/mm. Although the structures of the two compositions are pseudocubic and almost indistinguishable in the unpoled virgin state, the electric field response shows significant differences depending on composition. For both compositions, the application of an electric field results in a field induced phase transition in the direction of the minority phase. Electric cycling has an opposite effect on the phase composition and results in a decreased phase fraction of the minority phase in the fatigued remanent state at 0 kV/mm. (C) 2015 AIP Publishing LLC
URI
https://scholarworks.unist.ac.kr/handle/201301/17062
URL
http://scitation.aip.org/content/aip/journal/apl/106/22/10.1063/1.4922145
DOI
10.1063/1.4922145
ISSN
0003-6951
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