Ferroelectric Domain Structure of Na0.5K0.5NbO3 Crystal Grown by Floating Zone Method
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概要
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The ferroelectric domain structures of orthorhombic Na0.5K0.5NbO3 (NKN) crystals grown by the floating zone method are characterized. Three types of laminar domain of 30–80, 10–15, and 5–10 μm in width were found in the crystal cut perpendicular to the growth direction. The thinnest laminar domains were observed between two different 90° domains. Raman spectroscopy confirmed that the NbO6 units of the NKN perovskite-type structure in the thinnest domains were distorted compared with these in the neighboring laminar 90° domains. When an external electric field was applied vertically to the domain walls, the thinnest domain could release strain caused by the external electric field, and the strain was dispersed in several directions within the thinnest domains. The polarization response per cross section was enhanced by distorted NbO6 units in the case that the domain structures included the thinnest domains between wide laminar 90° domains.
- 2009-09-25
著者
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Kagomiya Isao
Department Of Applied Physics School Of Science And Engineering Waseda University:(present Address)m
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Kakimoto Ken-ichi
Department Of Material Science And Engineering Faculty Of Engineering Nagoya Institute Of Technology
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Inagaki Yumi
Department Of Materials Science And Engineering Graduate School Of Engineering Nagoya Institute Of Technology
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Kagomiya Isao
Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
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