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Microwave Based Synthesis; Structural, Optical and Magnetic Measurements of Co2+ Doped MnFe2O4

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Co2+ doped manganese ferrite (Mn1−x Co x Fe2O4, x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5) samples were synthesized by a microwave combustion method. Nitrates of the constituent elements and urea were respectively used as the oxidizer and fuel to drive the reaction. On an average a yield of 80% were obtained for all the compositions. Light-absorbing properties from UV-Vis diffuse reflection spectrum were studied and the results infer that the band gap energy (E g) of the pure MnFe2O4 is 1.76 eV and with increase in Co2+ ion concentration, it increases to 2.25 eV. The phase purity and crystal lattice symmetry were estimated from X-ray diffraction (XRD) and was identified as the spinel cubic crystal structure. The lattice parameter is found to decrease with an increase in Co content. The crystallite size was in the range of 19–25 nm. The purity and the composition of the elements were further confirmed by energy dispersive X-ray (EDX) results. Microstructural features obtained by scanning electron microscope (SEM) demonstrate that the nanocrystals were formed with a decrease in average grain size with Co2+ content. Room temperature magnetic measurement for stoichiometric samples is discussed with the help of vibrating sample magnetometer (VSM). The saturation magnetization (M s), remanant magnetization (M r) and coercivity (H c) are measured from the respective hysteresis plots.
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Document Type: Research Article

Publication date: 01 January 2016

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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