Preparation of nanocrystalline MnFe2O4 by doping with Ti ions using solid-state reaction route |
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| Authors: | S. Mishra T.K. Kundu K.C. Barick D. Bahadur D. Chakravorty |
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| Affiliation: | 1. Department of Physics and Technophysics, Vidyasagar University, Midnapore-721 102, W. B., India;2. Department of Physics, Visva-Bharati, Santiniketan-731235, W.B., India;3. Department of Metallurgical Engineering & Material Science, IIT, Powai, Mumbai-400076, India;4. Indian Association for the Cultivation of Science, Jadavpur, Kolkata-32, India |
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| Abstract: | Nanostructured manganese ferrites (MnFe2O4) with diameters in the range of 45–30 nm were synthesized by Ti4+ ion doping, using conventional solid-state reaction route. The substitution of Ti4+ ions created vacancies at Mn2+ sites and the coupling of ferrimagnetically active oxygen polyhedra was broken. This created nanoscale regions of ferrites. A reduction of magnetization for decreasing particle size was observed. Coercivity showed an increasing trend. This was explained as arising due to multidomain/monodomain magnetic behaviour of magnetic nanoparticles. DC resistivities of the doped specimens indicated the presence of an interfacial amorphous phase formed by the nanoparticles. Zero-field cooled and field-cooled curves from 30 nm sized particles showed a peak at TB (∼125 K), typical of superparamagnetic blocking temperature. |
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| Keywords: | Nanoparticles Nanoferrites Electrical conductivity |
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