Effects of A-site ionic size on the phase transition behavior of lead-free niobate ceramics |
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| Affiliation: | 1. Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Functional Materials Research Laboratory, School of Materials Science & Engineering, Tongji University, 4800 Caoan Road, Shanghai 201804, China;2. Key laboratory of inorganic nonmetallic crystalline and energy conversion materials, College of Materials and Chemical Engineering, China Three Gorges University, Yichang 443002, China;3. School of Physics and Electronic Science, Guizhou Normal University, Guiyang 550001, China;1. Department of Inorganic Materials, Shanghai University, China;2. Advanced Materials Department, Jožef Stefan Institute, Slovenia;1. Discipline of Metallurgy Engineering and Materials Science, Indian Institute of Technology Indore, Indore, 453552, India;2. Electronic Engg., Ming Chi University of Technology, New Taipei City, Taiwan;3. High Pressure & Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre, 400085, Mumbai, India;4. Synchrotrons Utilization Section, Raja Ramanna Center for Advanced Technology, Indore, 452013, India;1. Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai, 200050, People’s Republic of China;2. The State Key Lab of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai, 200050, People’s Republic of China;3. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, People’s Republic of China;1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Material Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;2. Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA |
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| Abstract: | Understanding the phase structure evolution is important for developing high performance lead-free piezoelectric materials. In this work, the effects of A-site ionic size of monovalent ions on the phase transition behaviors for the lead-free niobate ceramics ANbO3 (A = Li, Na, Ag, and K) are investigated using XRD analysis and dielectric measurement. The iso-valent ionic doping restrains the relaxation behavior that usually appears in the hetero-valent ionic-doped niobate ceramics. The A-site average ionic size of RA and its ionic radius differences of ΔRA are found to be crucial influence factors on the phase transition behaviors of the ANbO3 ceramics. Small Li+ doping stabilize tetragonal phase of the ANbO3 ceramics with RA > 1.47 Å, but stabilize rhombohedral phase of the ones with RA < 1.47 Å. On the other hand, The ANbO3 ceramics without Li+ doping prefer to orthorhombic phase due to indistinctive ionic size differences (ΔRA < 0.25 Å). Our results suggest that a certain phase and phase transition boundary could be designed by appropriate ionic doping for developing the niobate-based lead free piezoelectric ceramics. |
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| Keywords: | Lead-free piezoelectric ceramics Phase transition A-site doping Niobate ceramics |
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