Nanocrystalline nickel ferrites prepared by doping with niobium ions |
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| Affiliation: | 1. Department of Physics and Technophysics, Vidyasagar University, Midnapore-721102, W. B., India;2. IUC-DAEF, Bidhannagar, Kolkata-700098, India;3. Indian Association for the Cultivation of Science, Jadavpur, Kolkata-32, India;1. Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, People’s Republic of China;2. School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People’s Republic of China;1. MLS Professor׳s Unit, Indian Association for the Cultivation of Science, 2A & 2B Raja S.C. Mullick Road, Kolkata 700032, India;2. School of Materials Science and Engineering, Kensington, University of New South Wales, Sydney 2052, Australia;3. Department of Physics, Rammohan College, 102/1 Raja Rammohan Roy Sarani, Kolkata 700009, India;4. Department of Physics, Gurudas College, Kolkata 700054, India;1. Department of Physics, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad, M.S., India;2. Department of Basic Science and Humanities, Marathwada Institute of Technology (MIT), Aurangabad, M.S., India;3. Department of Physics, Yogeshwari College Ambajogai, Beed, M.S., India;1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry & Chemical Engineering, Nanjing University of Technology, Nanjing 210009, China;2. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Energy, Nanjing University of Technology, Nanjing 210009, China;3. Department of Chemical Engineering, Curtin University, Perth, WA 6458, Australia;1. Belarusian State University, 14 Leningradskaya, 220030 Minsk, Belarus;2. Research Institute for Physical-Chemical Problems of the Belarusian State University, 14 Leningradskaya, 220030 Minsk, Belarus;3. National Centre of Physics of Particles and High Energies, 18 Pervomajskaya str, 220088 Minsk, Belarus |
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| Abstract: | Doping of nickel ferrites by suitable aliovalent ions was explored in order to synthesize nanocrystalline ferrites. With the doping of Nb2O5, the size of NiFe2O4 is reduced down to 33 nm. The substitution of Nb5+ ions essentially break up the ferrimagnetically active oxygen polyhedra and the size of the grains are confined. An increase of coercive field and a decrease of magnetization is observed as the size of NiFe2O4 is reduced. This behavior can be explained introducing core-shell model of magnetic nanoparticles. Mössbauer spectra shows superparamagnetic doublet that supports the presence of smaller sized particles in the specimens. The DC resistivity of the doped specimens decreases by at least five orders of magnitude compared to pure sample. This is ascribed to the presence of an interfacial amorphous phase between the sites. |
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