Mishra, S. ; Kundu, T. K. ; Barick, K. C. ; Bahadur, D. ; Chakravorty, D. (2006) Preparation of nanocrystalline MnFe2O4 by doping with Ti4+ ions using solid-state reaction route Journal of Magnetism and Magnetic Materials, 307 (2). pp. 222-226. ISSN 0304-8853
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S03048...
Related URL: http://dx.doi.org/10.1016/j.jmmm.2006.04.005
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.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | Nanoparticles; Nanoferrites; Electrical Conductivity |
| ID Code: | 7442 |
| Deposited On: | 25 Oct 2010 11:31 |
| Last Modified: | 28 May 2011 04:31 |
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