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http://dx.doi.org/10.5369/JSST.2019.29.1.59

Depolarization Mechanism of Alternating-current-poled Pb(Mg1/3Nb2/3)O3-PbTiO3 Single Crystals Measured using in-situ thermally Stimulated Depolarization Current  

Lee, Geon-Ju (School of Materials Science and Engineering & Julich-UNIST Joint Leading Institute for Advanced Energy Research, Ulsan National Institute of Science and Technology (UNIST))
Kim, Hwang-Pill (School of Materials Science and Engineering & Julich-UNIST Joint Leading Institute for Advanced Energy Research, Ulsan National Institute of Science and Technology (UNIST))
Lee, Sang-Goo (iBULe Photonics, Inc.)
Lee, Ho-Yong (Department of Materials Science and Engineering, Sun Moon University)
Jo, Wook (School of Materials Science and Engineering & Julich-UNIST Joint Leading Institute for Advanced Energy Research, Ulsan National Institute of Science and Technology (UNIST))
Publication Information
Journal of Sensor Science and Technology / v.29, no.1, 2020 , pp. 59-62 More about this Journal
Abstract
Currently, increasing attention is being paid to relaxor-based ferroelectric single crystals in photoacoustic images, especially for high-end applications. Among the crystals are (1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-100xPT) single crystals located near their morphotropic phase boundary (x = 0.30-0.35) because of their ultrahigh piezoelectric and electromechanical coupling properties. The alternating current poling (ACP) treatment, rather than the conventional direct current poling treatment, has recently been spotlighted due to its effectiveness in enhancing the piezoelectric properties. So far, it has been suggested that the enhanced piezoelectricity originates from either a domain miniaturization to nanodomains or from an electric-field-induced monoclinic symmetry. In this study, we demonstrate by thermally stimulated depolarization current measurements that the effect of ACP is too complex to be explained using a single mechanism and that the proposed electric-field-induced monoclinic symmetry is unlikely to exist.
Keywords
relaxor-PT single crystal; alternating current poling, thermally-stimulated depolarization current;
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