SYNTHESIS AND CHARACTERIZATION OF CUBIC MgFe2O4 AND Mg0.9Ni0.1Al0.1Fe1.9O4 POWDER MAGNETIC MATERIALS

Abstract

MgFe2O4 and Mg0.9Ni0.1 Al0.1Fe1.9O4 ferrites were prepared by solid state reaction method for systematic investigation of their thermal, structure and magnetic properties. Single phase cubic spinel structure of the prepared materials was confirmed by X-ray diffraction analysis. Lattice parameter such as lattice constant, crystal size, unite cell volume, surface area and porosity of the synthesized materials were also calculated from x-ray diffraction patterns. The crystal sizes were found to be 66.9 nm for MgFe2O4 and 67.05 nm for Mg0.9Ni0.1 Al0.1Fe1.9O4. The lattice parameters were also found to be 0.8381 nm and 0.8403 nm for MgFe2O4 and Mg0.9Ni0.1 Al0.1Fe1.9O4 ferries, respectively. This showed that substitution of Ni and Al cations into MgFe2O4 increased its crystal size and lattice parameter. From FT-IR study, two absorption bands were observed between 417.3 and 568.9 cm−1 wave numbers, which correspond to the formation of the spinel cubic structure of both synthesized compounds. The magnetic properties of both synthesized materials were investigated by studying the saturation magnetization (Ms), remanent magnetization (Hr) and coercivity (Hc) using VSM. It was found that MgFe2O4 ferrite sample showed Ms, Mr and Hc values of 96.3 emu/g, 24.3 emu/g and 33.4 Gauss, respectively. In the case of Mg0.9Ni0.1Al0.1Fe1.9O4 ferrite sample, the Ms, Mr and Hc values were found to be 79.2 emu/g, 19.8 emu g−1 and 50.1Gauss, respectively. The lower in saturation magnetization on Mg0.9Ni0.1Al0.1Fe1.9O4 ferrite sample may be attributed to the non-magnetic nature of Al 3+ ions.