In this study, the macroscopic mechanical behavior was characterized as a function of temperature (−150 °C to 400 °C) for polycrystalline (Na0.5K0.5)NbO3 with three dopant concentrations. Dopants can improve certain electromechanical properties and, in the case of NKN and Li+, shift the orthorhombic-to-tetragonal phase transition temperature to lower temperatures. In this study, the mechanical behavior of undoped NKN, LNKN6 with 6 mol. % Li+, and LNKN6 with additional dopants was characterized and compared with the temperature dependent dielectric response and crystal structure. During mechanical loading, the samples showed a nonlinear hysteretic response. At low temperatures, this is understood to be due to ferroelasticity. At temperatures in the vicinity of the orthorhombic-tetragonal phase transition temperature, a closed hysteresis behavior was observed, corresponding to a local maximum of the critical ferroelastic stress and a minimum in the remanent strain. The observed closed hysteresis behavior is suggested to be due to a stress-induced structural phase transformation.
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28 November 2017
Research Article|
November 22 2017
Ferroelastic behavior across the orthorhombic-to-tetragonal phase transition region of NKN-based lead-free ferroelectrics Available to Purchase
Alexander Martin;
Alexander Martin
a)
1
Department of Materials Science, Friedrich-Alexander-Universität Erlangen-Nu¨rnberg
, 91058 Erlangen, Germany
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Ken-ichi Kakimoto;
Ken-ichi Kakimoto
2
Frontier Research Institute for Materials Science, Nagoya Institute of Technology
, Nagoya 466-8555, Japan
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Keiichi Hatano;
Keiichi Hatano
3
Materials R&D Department, R&D Laboratory, TAIYO YUDEN Co., Ltd.
, Takasaki, Gunma 370-3347, Japan
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Yutaka Doshida;
Yutaka Doshida
3
Materials R&D Department, R&D Laboratory, TAIYO YUDEN Co., Ltd.
, Takasaki, Gunma 370-3347, Japan
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Kyle G. Webber
Kyle G. Webber
1
Department of Materials Science, Friedrich-Alexander-Universität Erlangen-Nu¨rnberg
, 91058 Erlangen, Germany
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Alexander Martin
1,a)
Ken-ichi Kakimoto
2
Keiichi Hatano
3
Yutaka Doshida
3
Kyle G. Webber
1
1
Department of Materials Science, Friedrich-Alexander-Universität Erlangen-Nu¨rnberg
, 91058 Erlangen, Germany
2
Frontier Research Institute for Materials Science, Nagoya Institute of Technology
, Nagoya 466-8555, Japan
3
Materials R&D Department, R&D Laboratory, TAIYO YUDEN Co., Ltd.
, Takasaki, Gunma 370-3347, Japan
a)
Author to whom correspondence should be addressed: [email protected]
J. Appl. Phys. 122, 204102 (2017)
Article history
Received:
June 12 2017
Accepted:
November 05 2017
Citation
Alexander Martin, Ken-ichi Kakimoto, Keiichi Hatano, Yutaka Doshida, Kyle G. Webber; Ferroelastic behavior across the orthorhombic-to-tetragonal phase transition region of NKN-based lead-free ferroelectrics. J. Appl. Phys. 28 November 2017; 122 (20): 204102. https://doi.org/10.1063/1.4989759
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