Magnetic studies on LiFe5-xMnxO8 (0 ≤ x ≤ 0.9) ferrites

A systematic investigation of Mn doped lithium ferrites with composition formula, LiFe5-xMnxO8 (x = 0.0-0.9) have been undertaken mainly to explore the magnetic properties with possible underlying mechanism. The materials were prepared by sol-gel method and structural characterization was carried out by X-ray diffraction and scanning electron microscopy measurements. The room-temperature magnetic properties such as saturation magnetization, initial permeability, quality factor, etc. of these ferrites were analyzed as a function of Mn ion concentration. The value of saturation magnetization is found to decrease with increasing Mn concentration and the reason for underlying mechanism is discussed. The variations in initial permeability, quality factor with frequency, including the observed resonance phenomena around 3 MHz frequencies in these materials have been qualitatively explained. The results revealed that the Mn concentration was strongly influence the Curie temperature of Mn doped lithium ferrites. (C) 2012 Elsevier B.V. All rights reserved.