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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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Symmetry-bridging phase as the mechanism for the large strains in relaxor-PbTiO 3 single crystals

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Title
Symmetry-bridging phase as the mechanism for the large strains in relaxor-PbTiO 3 single crystals
Author
Kim, Hwang-PillLee, Geon-JuJeong, Hu YoungJang, Jin-HyuckKim, Gi-YeopChoi, Si-YoungLee, Ho-YongLee, Sang-GooJo, Wook
Issue Date
2019-09
Publisher
Elsevier Ltd
Citation
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, v.39, no.11, pp.3327 - 3331
Abstract
Relaxor-PbTiO 3 piezoelectric single crystals have been of a great interest, since the discovery of ultrahigh piezoresponse demonstrated in <001> -oriented crystals of the composition at the rhombohedral side of morphotropic phase boundary. It has been proposed that the exceptionally large piezoelectric properties should originate from an electric-field-induced polarization rotation that involves a reversible phase transformation between rhombohedral and tetragonal via monoclinic symmetry. However, this commonly accepted polarization rotation mechanism has its limit in explaining still the excellent piezoelectricity even at a small excitation field far below the coercive field. Here, we show by a comparative study using single crystals from two distinct processing techniques, the polarization rotation has, if ever, little influence on the strain properties of <001 > -oriented rhombohedral relaxor-PbTiO 3 single crystals. Instead, they may come from a reversible shear-mode piezoelectric contribution from electric-field-susceptible ‘symmetry-bridging’ unit-cell-level phases, the polarization direction of which spans monoclinic symmetry.
URI
https://scholarworks.unist.ac.kr/handle/201301/27013
URL
https://www.sciencedirect.com/science/article/pii/S0955221919302468?via%3Dihub
DOI
10.1016/j.jeurceramsoc.2019.04.022
ISSN
0955-2219
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UCRF_Journal Papers
MSE_Journal Papers
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