Changes in Ferroelectric Domain Structure with Electric Fatigue in Li<sub>0.06</sub>(Na<sub>0.5</sub>K<sub>0.5</sub>)<sub>0.94</sub>NbO<sub>3</sub> Ceramics
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概要
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Piezoelectric materials should have stable performance during electric cycling in service. Because piezoelectricity-related properties depend on the ferroelectric domain structure, it is essential to investigate the fatigue characteristics of domain structures under electric loading. Piezoresponse force microscopy (PFM) was used to observe changes in ferroelectric domain structure with cyclic electric loading in MnO<sub>2</sub>-doped Li<sub>0.06</sub>(Na<sub>0.5</sub>K<sub>0.5</sub>)<sub>0.94</sub>NbO<sub>3</sub> (LNKN) ceramics. The PFM observations revealed that polarization loss occurred owing to electric fatigue, and that domain width and length fraction of 180° domain walls increased with increasing number of cycles. The decreases in the piezoelectric constant $d_{33}$ and the electromechanical coupling coefficient $k_{\text{p}}$ observed owing to electric fatigue are compared with fatigue of the domain structure.
- 2011-09-25
著者
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TSUREKAWA Sadahiro
Department of Machine Intelligence and Systems Engineering, Graduate School of Engineering, Tohoku U
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TAKAHASHI Hirofumi
Fuji Ceramics Cooperation
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Morizono Yasuhiro
Department Of Materials Science And Engineering Graduate School Of Science And Technology Kumamoto U
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Tsurekawa Sadahiro
Department of Materials Science and Engineering, Graduate School of Science and Technology, Kumamoto University, Kumamoto 860-8555, Japan
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Morizono Yasuhiro
Department of Materials Science and Engineering, Graduate School of Science and Technology, Kumamoto University, Kumamoto 860-8555, Japan
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Hatao Hiroki
Department of Materials Science and Engineering, Graduate School of Science and Technology, Kumamoto University, Kumamoto 860-8555, Japan
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