Structural and magnetic properties investigation of sintered Mn_XMg_1-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 Mn_XMg_1-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 (D_XRD) 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 (M_S), coercivity (H_C) and remanence (M_r) 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 H_C from 23 to 10 Oe and decreased Curie temperature from 392 to 294°C.

Online publication date: Mon, 22-Aug-2016

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