Morphology control and phase transition of hexagonal sodium niobate particles |
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| Affiliation: | 1. Department of Intelligent Systems Design Engineering, Faculty of Engineering, Toyama Prefectural University, Imizu, Toyama 939-0398, Japan;2. The Key Lab of Inorganic Functional Materials and Device, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, PR China;3. Toyama Industrial Technology Center, Takaoka, Toyama 933-0981, Japan;1. Electroceramic Research Laboratory, College of Nanotechnology, King Mongkut''s Institite of Technology Ladkrabang, Bangkok 10520, Thailand;2. Department of Electronics, Faculty of Engineering, King Mongkut''s Institute of Technology Ladkrabang, Bangkok 10520, Thailand;3. Advance Materials Research Unit, Faculty of Science, King Mongkut''s Institute of Technology Ladkrabang, Bangkok 10520, Thailand;4. Department of Chemistry, Faculty of Science, King Mongkut''s Institute of Technology Ladkrabang, Bangkok 10520, Thailand;1. Department of Chemistry, Durham University, South Road, Durham DH1 3LE, UK;2. ISIS Facility, Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0QX, UK;1. Empa, Swiss Federal Laboratories for Materials Science & Technology, 8600, Dübendorf, Switzerland;2. Electroceramic Department, Instituto de Cerámica y Vidrio, CSIC, Kelsen 5, 28049 Madrid, Spain;1. Department of Physics, H. N. B. Garhwal University, Srinagar, Garhwal, 246174, India;2. University Science Instrumentation Centre, H. N. B. Garhwal University, Srinagar, Garhwal, 246174, India;1. Key Laboratory of Fine Chemicals of College of Heilongjiang Province, Qiqihar University, Qiqihar 161006, China;2. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China;3. School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;1. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, PR China;2. Key Laboratory of E&M, Zhejiang University of Technology, Hangzhou 310014, PR China |
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| Abstract: | Hexagonal NaNbO3 particles with an ilmenite structure and plate-like morphology were synthesized by a hydrothermal method. The morphological evolution of the solid products with the increasing mineralizer concentration was monitored via SEM during the hydrothermal reaction. By carefully controlling the mineralizer concentration, particles with a diameter of 10–60 µm and a thickness of 1–10 µm were obtained. The particles were transformed from the ilmenite structure into the perovskite structure during the thermal treatment at 600 °C. Their plate-like morphology was maintained with some cracking on the surface. The surface orientation of the perovskite particles was micro- and macroscopically characterized by EBSD and XRD analysis, respectively. The results indicate that thinner particles tend to be more oriented in the (00 l) crystal planes. |
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| Keywords: | Sodium niobate Hexagonal Phase transition (001) orientation |
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