Structural and magnetic properties investigation of sintered MnXMg1-XFe2O4 ferrites from nanopowders prepared via co-precipitation method
by Sohrab Manouchehri; Seyed Taghi Mohammadi Benehi; Mohammad Hassan Yousefi; Javad Zahmatkesh; Mohsen Abdollahi
International Journal of Nanoparticles (IJNP), Vol. 9, No. 1, 2016

Abstract: Nanoferrite powders having composition MnXMg1-XFe2O4 (x = 0.0, 0.2, 0.4, 0.6, 0.8) were synthesised by the chemical co-precipitation method and then sintered as the pellets. The X-ray diffraction (XRD), Alternating Gradient Force Magnetometer (AGFM) techniques and Curie temperature measurement were used to carry out this study. The XRD patterns confirm the nanosized dimension of the samples and showed that the samples are single phase cubic spinel nanoferrites. From the analysis of XRD data using Scherrer's formula, the average crystallite size (DXRD) of the particles was found to decrease from 81 to 55 nm with increasing manganese substitution. Substitution of Mn2+ in MgFe2O4 causes an increase in the lattice constant (a) from 8.35 to 8.43 Å. The magnetic parameters such as saturation magnetisation (MS), coercivity (HC) and remanence (Mr) with increasing Mn2+ concentration are studied at room temperature by an AGFM. Substitution of Mn2+ for Mg2+ increased MS from 21.2 to 74.7 emu g−1 and decreased HC from 23 to 10 Oe and decreased Curie temperature from 392 to 294°C.

Online publication date: Wed, 17-Aug-2016

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