Synthesis of Nanocrystalline Ni0.5Zn0.5Fe2O4 by Aerosol Route and Its Characterization
Nano-size particles of Ni0.5Zn0.5Fe2O4 ferrite were prepared through aerosol route. The solutions of iron, nickel and zinc nitrates were mixed in stoichiometric proportion, passed through a pneumatic nebulizer, to get very fine mist (aerosols), and a furnace at ~600°C in air atmosphere. Through various events in succession, metal atoms form ferrite in air. The average particle size was found to be 16±6 nm which increased to 80±8 nm after annealing at 1000°C. The room-temperature magnetic moment of the sample as obtained and after annealing it at various temperatures indicate that the saturation magnetization increases from 1.80 to 72.8 emu/g, while remanent magnetization increases from 0.28 to 25.0 emu/g. Mössbauer spectrum of the sample at room temperature exhibited a doublet with δ (Fe) = 0.33 mm s−1 and Δ EQ = 0.78 mm s−1 suggesting superparamagnetic nature. However, after annealing at 1000°C this doublet got converted into two magnetic sextets with B = 52.4 T and 49.0 T suggesting increase in particle size on annealing. These observations are in conformity with Transmission Electron Microscope (TEM) and X-Ray Diffraction (XRD) results that the particle size increases after annealing the sample at higher temperatures.
KeywordsZinc Permeability Nickel Furnace Ferrite
Unable to display preview. Download preview PDF.
- 2.Chow, G. M. and Ivanova, N. N., Nanostructural Materials Science and Technology, Kluwer Academic Publishers, Dordrecht, 1998.Google Scholar
- 4.Ishino, K. and Narumiya, Y., Ceramic Bull. 66 (1987), 1469.Google Scholar
- 11.Klug, H. P. and Alexander, L. E., X-Ray Diffraction Procedures for Polycrystalline and Amorphous Materials, 2nd edn, Wiley, 1974, Chapter 9.Google Scholar
- 13.Kim, C. S., Kim, W. C., An, S. Y. and Lee, S. W., J. Mag. Mag. Mat. 215–216 (2002), 213.Google Scholar