Influences of secondary phases on ferroelectric properties of Bi(Na,K)TiO3 ceramics |
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| Affiliation: | 1. Institute of Research in Materials Science and Technology (INTEMA), Juan B. Justo 4302, Mar del Plata B7608FDQ, Argentina;2. Electroceramic Department, Instituto de Cerámica y Vidrio, CSIC, Kelsen 5, 28049 Madrid, Spain;1. Department of Physics and EHSRC, University of Ulsan, Ulsan 680-749, Republic of Korea;2. School of Materials Science and Engineering, University of Ulsan, Ulsan 680-749, Republic of Korea;3. Department of Physics, University of Science and Technology, Bannu, Khyber Pakhtunkhwa, Pakistan;4. Korea Electrotechnology Research Institute, Changwon 641-120, Republic of Korea;1. College of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, People’s Republic of China;2. The State Key Lab of High Performance Ceramics and Superfinemicrostructure, Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai 200050, People’s Republic of China;1. School of Advanced Materials Engineering, Changwon National University, Gyeongnam 641-773, Republic of Korea;2. School of Materials Science and Engineering, University of Ulsan, Ulsan 680-747, Republic of Korea;3. Department of Physics, Changwon National University, Gyeongnam 641-773, Republic of Korea;1. School of Materials Science and Engineering, University of Ulsan, Ulsan 680-749, Republic of Korea;2. School of Engineering Physics, Ha Noi University of Science and Technology, 1 Dai Co Viet Road, Ha Noi, Viet Nam;3. Department of Physics, Incheon National University, Incheon 406-772, Republic of Korea |
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| Abstract: | The effect of secondary phases on ferroelectric properties of Bi0.5(Na0.8K0.2)0.5TiO3 (BNKT) is studied. Ceramic powders are prepared by the solid-state reaction method where the influence of different sintering temperatures is also studied. Then, samples are characterized by X-ray diffraction (XRD), Raman microspectroscopy, Scanning Electron Microscopy and impedance spectroscopy. Through XRD and Raman results, the perovskite structure is detected; together with small peaks corresponding to a secondary phase associated with a K2−xNaxTi6O13-based phase. The secondary phases amount increases with the sintering temperature, yielding different combinations of K2−xNaxTi6O13- and Bi0.5(Na1−yKy)0.5TiO3-based phases. Moreover, the content of the secondary phase improves the d33 piezoelectric constant and dielectric properties of BNKT ceramics. These results can benefit the understanding of BNKT ceramics and the expanding of their applications range. |
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| Keywords: | A. Powders: solid state reaction C. Ferroelectric properties C. Piezoelectric properties D. Perovskites |
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