Dielectric relaxation in tetragonal tungsten bronze ceramics |
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| Institution: | 1. ICMCB-CNRS, 87 Avenue du Dr A. Schweitzer, 33608 Pessac Cedex, France;2. Institute of Physics, ASCR, 182 21, Praha 8, Czech Republic;1. Department of Physics, Augustine University, P.M.B. 1010, Ilara-Epe 106101, Lagos State, Nigeria;2. Department of Physics, Federal University of Agriculture, PMB 2240 Abeokuta, Nigeria;1. School of Physics and Electronic Information, Yan''an University, Yan''an 716000, China;2. State Key Laboratory of Solidification Processing, MIIT Key Laboratory of Radiation Detection Materials and Devices, USI Institute of Intelligence Materials and Structure, NPU-QMUL Joint Research Institute of Advanced Materials and Structure, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi''an 710072, China;3. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, School of Electronic Science and Engineering, Faculty of Electronic and Information Engineering, Xi''an Jiaotong University, Xi''an 710049, China;1. Key Laboratory for Macromolecular Science of Shaanxi Province, School of Materials Science and Engineering, Shaanxi Normal University, Xi’an, 710062, Shaanxi, PR China;2. School of Chemistry and Chemical Engineering, Shaanxi Normal University, PR China;1. School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, UK;2. State Key Laboratory of Solidification Processing, MIIT Key Laboratory of Radiation Detection Materials and Devices, USI Institute of Intelligence Materials and Structure, NPU-QMUL Joint Research Institute of Advanced Materials and Structure, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi''an, China;3. Institute of Physics, Slovak Academy of Sciences, Dúbravská Cesta 9, 845 11 Bratislava, Slovak Republic;4. Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 04353, Košice, Slovak Republic |
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| Abstract: | Ferroelectric tantalates with the tetragonal tungsten bronze (TTB) type structure were studied over a wide frequency range from 102 to 109 Hz. Complementary microwave measurements at 36 GHz and micro-Raman experiments were performed in order to extend the dielectric study. A high frequency relaxation was observed above 108 Hz and fitted to the Cole–Cole formula. Different qualitative models are proposed to explain the understanding of the origin of the high frequency relaxation in ferroelectrics. Among these, polar clusters of ferroelectric active off-centred Ta5+ ions are considered. |
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