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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/6898

Title: Preparation of nanocrystalline MnFe2O4 by doping with Ti4+ ions using solid-state reaction route
Authors: MISHRA, S
KUNDU, TK
BARICK, KC
BAHADUR, D
CHAKRAVORTY, D
Keywords: lead-zirconate-titanate
dynamic properties
ferrites
nanoparticles
temperature
nickel
size
particles
nife2o4
Issue Date: 2006
Publisher: ELSEVIER SCIENCE BV
Citation: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 307(2), 222-226
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 Mn 21 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 T-B (similar to 125 K), typical of superparamagnetic blocking temperature. (c) 2006
URI: http://dx.doi.org/10.1016/j.jmmm.2006.04.005
http://dspace.library.iitb.ac.in/xmlui/handle/10054/6898
http://hdl.handle.net/10054/6898
ISSN: 0304-8853
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