Symmetry-bridging phase as the mechanism for the large strains in relaxor-PbTiO 3 single crystals
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- Symmetry-bridging phase as the mechanism for the large strains in relaxor-PbTiO 3 single crystals
- Kim, Hwang-Pill; Lee, Geon-Ju; Jeong, Hu Young; Jang, Jin-Hyuck; Kim, Gi-Yeop; Choi, Si-Young; Lee, Ho-Yong; Lee, Sang-Goo; Jo, Wook
- Issue Date
- Elsevier Ltd
- JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, v.39, no.11, pp.3327 - 3331
- 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.
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