Magnetic properties of ferrites synthesized by low temperature technique

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Abstract

Spinel ferrites have attracted a great deal of attention due to their application potential. These ferrites are attractive as well as from the theoretical point of view. Magnetic properties of the bulk materials differ drastically from the nano-sized materials. Often high temperature sintering is used to synthesize the nano-sized materials via solid state reaction route. This method yields bulk ferrites. For nano-sized materials low temperature sintering is required as basic requirement. Copper zinc ferrites have been synthesized by hydrothermal process which employs the decomposition of the hydroxides precursor at about 100°C. These samples were characterized by X-ray diffractometer (XRD), vibrating sample magnetometer (VSM), electron paramagnetic resonance (EPR) and Mössbauer spectroscopy. The average particle size in these sintered samples measured by XRD is found to vary from 10 to 150 nm. The XRD shows the formation of single phase spinel structure in all the samples. EPR gives the single asymmetric line at g ∼ 2 with a line width of several hundred gauss. VSM displays non-saturating hysteresis loops and Mössbauer spectra show two sets of sextet related to two distinct sites of iron: site-A and site-B.

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