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Orientation-dependent electromechanical properties of Mn-doped (Li,Na,K)(Nb,Ta)O3 single crystals

Liu, Hairui and Koruza, Jurij and Rytz, Daniel and Maglione, Mario and Rödel, Jürgen :
Orientation-dependent electromechanical properties of Mn-doped (Li,Na,K)(Nb,Ta)O3 single crystals.
[Online-Edition: http://dx.doi.org/10.1063/1.4964465]
In: Applied Physics Letters, 109 (152902) pp. 1-5. ISSN 00036951
[Article] , (2016)

Official URL: http://dx.doi.org/10.1063/1.4964465

Abstract

Orientation and temperature dependence of dielectric and electromechanical properties of Mndoped (Li,Na,K)(Nb,Ta)O3 single crystals were investigated. Samples exhibited very low dielectric losses, with tand between 0.03 and 0.05 over a broad temperature range between room temperature and 480 °C. Influences of the crystallographic structure and external electric field on polarization and strain parameters are discussed. The orientation-dependent electrical properties were ascribed to the anisotropic polarization rotation in the crystals. Higher maximum polarization, coercive field, and negative strain were achieved when the electric field was oriented along one of the spontaneous polarization directions. The highest maximum unipolar strain of 0.42% (at 3 kV/mm) and the normalized strain d33* of 1391 pm/V were obtained in the [001]PC-oriented sample at 100°C, which was much higher than the values obtained for the [110]PC-oriented sample. Further insight of the phase transition behavior is given by comparing the temperature-dependence of the small- and large-signal dielectric and piezoelectric properties. The observed changes are rationalized by the different increase rates of the dielectric permittivity and piezoelectric coefficients with temperature.

Item Type: Article
Erschienen: 2016
Creators: Liu, Hairui and Koruza, Jurij and Rytz, Daniel and Maglione, Mario and Rödel, Jürgen
Title: Orientation-dependent electromechanical properties of Mn-doped (Li,Na,K)(Nb,Ta)O3 single crystals
Language: English
Abstract:

Orientation and temperature dependence of dielectric and electromechanical properties of Mndoped (Li,Na,K)(Nb,Ta)O3 single crystals were investigated. Samples exhibited very low dielectric losses, with tand between 0.03 and 0.05 over a broad temperature range between room temperature and 480 °C. Influences of the crystallographic structure and external electric field on polarization and strain parameters are discussed. The orientation-dependent electrical properties were ascribed to the anisotropic polarization rotation in the crystals. Higher maximum polarization, coercive field, and negative strain were achieved when the electric field was oriented along one of the spontaneous polarization directions. The highest maximum unipolar strain of 0.42% (at 3 kV/mm) and the normalized strain d33* of 1391 pm/V were obtained in the [001]PC-oriented sample at 100°C, which was much higher than the values obtained for the [110]PC-oriented sample. Further insight of the phase transition behavior is given by comparing the temperature-dependence of the small- and large-signal dielectric and piezoelectric properties. The observed changes are rationalized by the different increase rates of the dielectric permittivity and piezoelectric coefficients with temperature.

Journal or Publication Title: Applied Physics Letters
Volume: 109
Number: 152902
Publisher: AIP Publishing
Divisions: 11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences
Date Deposited: 13 Oct 2016 05:37
Official URL: http://dx.doi.org/10.1063/1.4964465
Identification Number: doi:10.1063/1.4964465
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