Synthesis and characterization of Ni-Zn doped ferrite nanoparticles
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Date
2018-07
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
A high level of attention today is being given to Nanoscience and Technology worldwide. In the present work, all the nanoparticles are synthesized by Chemical coprecipitation method. Firstly Magnetite nanoparticles are formed which are found to be oxidized to Maghemite phase. Maghemite phase is indicated by a peak shoulder in the FTIR spectra. To tackle this problem of oxidation and agglomeration, oleic acid is used in next synthesis of Magnetite. The prepared samples were characterized by FTIR, where peak of C=O confirms that oleic acid is successfully grafted in the surface of the particles. The peak shoulder corresponding to Maghemite phase is not visible in FTIR spectra. Oleic acid is found to be a better caping agent in protecting further oxidation of Magnetite. To enhance some properties of Ferrites, Ni (Magnetic) and Zn (Non magnetic) are doped in various stochiometric ratios. Ni-Zn doped nanoparticles coated with oleic acid are again synthesized by chemical co-precipitation method. FTIR study reveals the presence of Maghemite phase. The particle size is calculated to be around 7 nm for all the samples and the lattice parameter varies from 8.21 Å to 8.32 Å. Lattice parameter for Ferrite doped with only Zinc is highest i.e. 8.32 Å while the lattice parameter of Ferrite doped with only Nickel is found to be least i.e. 8.21 Å. For intermediate doped particles, lattice parameter varied due to contradictory positions of Ni and Zn in Magnetite and Maghemite. No significant effect of Ni-Zn doping is observed in particle size. EPR study tells the Ferromagnetic nature of the Ni-Zn Ferrites. It can be concluded that oleic acid works well as a surfactant for Magnetite particles but was not able to protect Ni-Zn doped Ferrite nanoparticles or the proper amount of Oleic acid to be used in Ni-Zn Ferrite must be calculated in further studies.
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