Crystal growth and ferroelectric property of Na0.5K0.5NbO3 and Mn-doped Na0.5K0.5NbO3 crystals grown by floating zone method |
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| Authors: | Yumi Inagaki Ken-ichi Kakimoto Isao Kagomiya |
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| Affiliation: | 1. Condensed Matter Science and Technology Institute, Harbin Institute of Technology, Harbin 150080, China;2. Departmen of Chemistry, Harbin Institute of Technology, Harbin 150001, China;3. School of Engineering and Materials Science, Queen Mary University of London, Mile Road, London E1 4NS, United Kingdom;4. Deaprtment of Mathematics and Materials Research Institute, The Pennsylvania State University, University Park, PA 16802, USA;1. Departament de Química Inorgànica, Universitat de Barcelona, 08028 Barcelona, Spain;2. Department of Applied Physics, Universitat Politècnica de Catalunya, 08034 Barcelona, Spain;3. Laboratory of SPMS, Ecole Centrale Paris, Grande voie des vignes, 92295 Chatenay-Malabry Cedex, France;1. Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea;2. Samsung Electronics Co., Ltd., Hwasung 18448, Republic of Korea;3. Department of Physics, University of Ulsan, Ulsan 44610, Republic of Korea;4. Graduate School of EEWS, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea;5. Korea Institute of Ceramic Engineering and Technology, Jinju 52851, Republic of Korea;1. School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, PR China;2. Department of Materials Science and Engineering, Advanced Materials Processing and Analysis Center, University of Central Florida, Orlando, FL 32816, USA;1. Department of Physics, Harbin Institute of Technology, Harbin 150001, China;2. Key Lab of In-fiber Integrated Optics of Ministry of Education, College of Science, Harbin Engineering University, Harbin 150001, China;3. Condensed Matter Science and Technology Institute, Harbin Institute of Technology, Harbin 150001, China |
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| Abstract: | Na0.5K0.5NbO3 (NKN) and Mn-doped NKN crystals, which are one of the promising candidates of lead-free piezoelectric materials, were grown by using a floating zone (FZ) method. The resulting crystal growth was compared with crystal growth that resulted from using a flux method in a previous study. In the crystal grown by FZ method under where the growth rate was controlled to 3 mm/h, thin layers formed parallel and perpendicular directions to the growth direction. In the crystal grown by FZ method, the crystal structure could not be classified as having the orthorhombic lattice of Amm2, which was observed in the crystal grown using a flux method. It was found that doped Mn was substituted in the perovskite-type lattice of NKN. Pure NKN crystals showed 90° domains that had a zig-zag shape, whereas Mn-doped NKN crystals were aligned to the domain layers in straight lines. It was confirmed that Mn-doped NKN crystal showed a square P–E hysteresis loop. |
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