Dielectric and magnetic properties of multiferroic BiFeO3 ceramics sintered with the powders prepared by hydrothermal method |
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| Institution: | 1. School of Physics and Information Technology, Shaanxi Normal University, Xi''an 710062, People''s Republic of China;2. College of Applied Science and Technology, Hainan University, Danzhou 571737, People''s Republic of China;3. School of Materials Science and Engineering, University of Jinan, Jinan 250022, People''s Republic of China;1. Department of Physics, National Institute of Technology, Durgapur 713209, India;2. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India;3. CSIR-Central Mechanical Engineering Research Institute, Durgapur 713209, India;1. Department of Chemistry and Chemical Engineering, Shaanxi Key Laboratory of Chemical Reaction Engineering, Yan''an University, Yan''an, Shaanxi, 716000, China;2. Department of Scientific Research and Development, Tsinghua University, Beijing, 100084, China;1. Key Laboratory of Materials Physics, Institute of Solid State Physics, CAS, Hefei 230031, PR China;2. High Magnetic Field Laboratory, CAS, Hefei 230031, PR China;1. School of Physics, Southeast University, Nanjing 211189, China;2. Department of Physics, Nanjing University, Nanjing 210093, China;3. Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China;4. National Laboratory of Solid State Microstructures, Nanjing 210008, China;1. Department of Physics, Presidency College, Chennai 600005, India;2. Department of Physics, Park College of Engineering and Technology, Coimbatore 641659, India;3. Department of Urology, Singapore General Hospital, Singapore 169856, Singapore;4. Department of Physics, Hindustan University, Chennai 603103, India |
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| Abstract: | BiFeO3 ceramics were sintered in the temperature range of 700–900 °C by using the pure BiFeO3 powders hydrothermally synthesized at 250 °C. The low reaction temperature and low sintering temperature prevent the element volatilization and phase decomposition. The ceramics sintered at 800 and 850 °C exhibit much dense microstructure with clear grains and grain boundaries. They also show high dielectric constant, dielectric dispersion and low loss tangent. At room temperature, the dielectric behaviors of BiFeO3 ceramics are mainly attributed to the transition of localized charge carriers and the microstructure of grains and grain boundaries. The temperature dependence of dielectric constant and loss tangent confirms that the localized charge carriers are a main contribution to the dielectric permittivity. Activation energy Eα of relaxation process for the BiFeO3 ceramic sintered at 850 °C is 0.397 eV. The obtained BiFeO3 ceramics show magnetic responses, which are relative to the grain size. |
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