A STUDY OF LOW TEMPERATURE SINTERED Mg–Mn NANO-FERRITES

Abstract

In the present study, Mg x Mn 1–x Fe 2 O 4 series of ferrites with x = 0.1, 0.3, 0.5, 0.7 and 0.9 were prepared by the citrate precursor technique. One set of samples was subjected to normal and the other to hot-pressed technique. Microstructural properties were studied with the help of X-ray diffraction (XRD) and scanning electron microscopy (SEM) for both sets of samples. Hot pressing of Mg – Mn ferrites results in an improvement of their magnetic and micro-structural properties, as it simultaneously controls grain growth and porosity. Hot pressing of Mg – Mn ferrites, however, results in deterioration of their dc resistivity. The cation distribution has been studied by X-ray analysis and magnetization. The variation of saturation magnetization and Curie temperature with increasing concentration of Mg 2+ ions can be explained on the basis of cation distribution and Neel two sublattice models. Possible mechanisms, models and theories contributing to these results have been discussed.