Effect of heat treatment on MnxZn(1-x)Fe2O4 nanoparticles prepared by mechanochemical method using metal oxides
Journal Title: Carbon - Science and Technology - Year 2013, Vol 5, Issue 2
Abstract
Nanoparticles of MnxZn(1-x)Fe2O4 where x = 0.625, 0.65 and 0.675 with grain size ranging between 15 nm – 25 nm were prepared by novel technique employing low temperature autocombustion. XRD, IR and TEM techniques were used to obtain structural and morphological characterizations. XRD and IR spectra confirmed the formation of spinel structure. Stoichiometry of the samples was confirmed with EDS spectral analysis. Nanocrystalline nature of the sample was observed in HRTEM of the samples and formation of the nanoparticles was confirmed by measuring crystallite size using XRD pattern and TEM. Magnetic properties of the nanosample obtained with VSM give values ranging between 45.25 – 50.92 emu/gm;0.0009 - 0.0055 Tesla, and 2.77 – 9.4 emu/gm for saturation magnetization, coercivity and retentivity, respectively. Curie temperature values ranging between 3800C – 540 oC were obtained for the powdered samples. Magnetic measurements like saturation magnetization Ms, coercivity Hc, and retentivity Mr, carried out on the bulk samples obtained at 900 oC show that the samples lose the magnetic properties and behaved as paramagnetic material.
Authors and Affiliations
G. V. S. Kundaikar
Keywords
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