| Study on Hyperfine parameters of the MgFe2O4, ZnFe2O4, MnFe2O4 nanoferrites |
| Paper ID : 1179-UFGNSM-FULL |
| Authors: |
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mahmoud naseri *1, mahshid chireh2, Fateme Khanjarian3 1Departmentof physices, University of malayer, Malayer, Postal code: 657119-95863, Iran 2Department of Physics, University of Malayer, Malayer, Iran 3Department of Physics, University of Malayer, Malayer |
| Abstract: |
| the hyperfine parameters of three groups of ferrite namely magnesium ferrite, zinc ferrite and manganese ferrite were calcined at different temperatures studied by used of mossbauer spectroscopic techniques. These nano ferrites were prepared by different methods and calcined at different temperatures. The Mossbauer spectra of all the samples of ZnFe2O4 showed a single doublet and no sign of any six-line pattern, which is strongly attributed to superparamagnetic character. Mossbauer spectrum of MgFe2O4 exhibit only two sextets, indicating the samples were ferromagnetic and Fe3+ ions occupy both tetrahedral and octahedral sites of spinelstructure. The Mossbauer spectrum of the MnFe2O4 samples exhibited simultaneous presence of a weak central paramagnetic doublet superimposed on strong broad magnetic sextet, indicating the transformation to an ordered magnetic structure. Thedoublet pattern of the samples of MnFe2O4 calcined at 450 and 500 ̊C indicated that the particles exhibited superparamagnetism. Two sexsets were appeared along with a doublet in the Mossbauer curves corresponding to samples obtained at 700 ̊C, which indicated that the particles of the MnFe2O4 in this temperature had a ferromagnetic character. The difference between the magnetic behavior in the samples of this work can be attributed to the hyperfine parameters such as hyperfine field and cationdistribution in the structure, which could be associated with temperature. |
| Keywords: |
| Key words: Nanoparticles, Magnesium ferrite, zinc ferrite, Manganese ferrite, Mossbauer spectroscopy, Hyperfine structure, Cation distribution |
| Status : Paper Accepted (Poster Presentation) |
