Synthesis and characterization of pure single phase Ni-Zn ferrite nanopowders by oxalate based precursor method |
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Authors: | Prita Pant Sarangi MK Patra |
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Affiliation: | a Chemistry Group, Birla Institute of Technology and Science-Pilani, Goa Campus, Zuarinagar-403726, India b Defence Lab, Jodhpur-342011, India |
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Abstract: | Series of single-phase Ni1 − xZnxFe2O4 (x = 0.20, 0.35, 0.50 and 0.60) nanopowders with average particle size of ∼ 35 nm have been synthesized by using oxalate based precursor method. Precursor powders were synthesized by reacting aqueous solutions of metal nitrates and oxalic acid by using different total metal ions: oxalic acid molar ratios and then evaporating them to dryness. Pure, single-phase Ni-Zn ferrite nanopowder was formed by calcining the precursor with total metal ion: oxalic acid ratio of 1:0.125 at a temperature of 850 °C. The synthesized nanopowders were characterized by using X-ray diffraction, Thermo-gravimetric and Differential Scanning Calorimetric analysis, Transmission Electron Microscope and Scanning Electron Microscope. Room temperature DC resistivity of the nanopowders was measured with respect to temperature by the two-probe method and was of the order of ∼ 107 Ωcm. Room temperature saturation magnetization was measured by using Vibrating Sample Magnetometer and it varied between 34-49 emu/g depending on the composition. This aqueous solution based method provides a simple and cost-effective route to synthesize single phase, Ni-Zn ferrite nanopowders. |
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Keywords: | nanopowders X-ray methods Chemical preparation Electrical properties Ferrites |
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