Nickel ferrite nanoparticles with chemical formula NiFe2O4 were prepared by standard sol-gel auto ignition technique. Citric acid was used as chelating agent and mixed with solution of nickel nitrate and ferric nitrate in 3:1 proportion to balance the oxidizer to reducer ratio. The obtained particles were sintered at 550°C for 4h to remove the water content, impurity and to obtain better crystallinity. The phase purity and structural formation was confirmed through the analysis of X-ray diffraction technique. The results of X-ray diffraction analysis show the single phase cubic spinel nanocrystalline structure. The particles size calculated from FWHM of the strongest peak (311) is 22 nm in the nanometer dimension. The lattice constant, X-ray density and other structural parameters calculated from XRD data are in good agreement with the literature values. The magnetic measurements were taken at room temperature using hysteresis loop technique. Using M-H plot, the different magnetic parameters such as saturation magnetization, coercivity, remanence magnetization and magneton number were deduced.

Nickel ferrite nanoparticles have been prepared using clove and citric acid as fuels. Present work focuses the rapid, eco-friendly, inexpensive, green synthesis over regular chemical routes for the preparation of most applicable Nickel ferrite nanoparticles. Here we use Clove (Syzygium aromaticum) extract and citric acid as fuel for green and chemical route synthesis of nickel ferrite nanoparticles respectively. The synthesis of metal nanoparticles using clove extract is a modern alternative for their production. The combination of methods of soft chemistry and green chemistry is the ideal synthesis strategy. Their structural properties are characterized using X-ray diffraction (XRD) study. The XRD study revealed the cubic spinel structure of the Fd3m space group. Also found 24 nm and 26 nm average crystallite size of NiFe2O4-clove and NiFe2O4-C6H8O7 nanoparticles respectively. This comparative study helps to increase attention in various research areas leading to materials that are relatively reproducible and have excellent properties using environmentally friendly, non-toxic and bio-composite reagents.

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