Structural and magnetic characterization of the Mg0.2-xSrxMn0.8Fe2O4 nanoparticles

A series of as-prepared Mg0.2-xSrxMn0.8Fe2O4 nanu-ferrites, 0 <= x <= 0,2, have been prepared by the chemical co-precipitation method. The X-ray diffraction (XRD), infrared (IR) and vibrating sample magnetometer techniques were used to carry out this study. The results proved that samples are single-phase cubic spinet nanolerrites. The lattice constant a, crystallite size R, IR band positions and force constants proved the existence of ferromagnetically ordered nanoclusters. The density, theoretical density, porosity (P) and the crystallite size showed dependence on Sr2+ ion content x. Six absorption bands were observed in the IR spectra and were assigned to the corresponding site bonds. The saturation magnetization (M-s), coercivity, remnant magnetization, squareness and magnetic moment were x dependent. This study proved that Ms is strongly dependent on P and R. whereas the lR absorption bands nu(1) and nu(2) were affected by he variation of a and M-s. (C) 2014 Elsevier B.V. All rights reserved.